Answer:
If we don't follow lab safety rules, someone could end up seriously hurt or lab equipment could get broken
Answer:
to ensure our safety when dealing with dangerous chemicals
What should you never do when you switch objectives, e.g., from scanning power to low
power or from low power to high power?
WIL
The lens will move either towards the specimen or away from the specimen.
The microscope is the tool or device used to see the very minute organisms which are not visible by the normal eye and is used in many places like laboratories, offices, schools, colleges , in research labs, and is used for the purpose of scientific research and seeing the detailed structures of the objects and has many components like ocular lenses, slide placer, light reflector and so on and there are methods which can to change the length of the lens or they can be adjusted to different powers like 4x, 10x, or 40 x or 100 x to see very minute to minute details and when you change the power from low to high the high power objective lens will change and directly start moving towards or over the specimen and when it changes from the high power to low power then the low power objective lens rotaes away from the specimens and due to theses changes it can alter the magnification of the specimen and also the intensity of the light and also can increase or decresa the area of the surface which is veiwed and the depth of feild is also changed and also thw working of distance and resolution burt the fact is even if the power is changed the image can be adjusted and focused and it should be to have clear image of the object placed under microscope.
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Why does a gram stain cause gram positive bacteria to turn purple and gram negative bacteria to turn pink?
The thick strong layer of peptidoglycans present in the cell walls of Gram-positive bacteria generates the characteristic violet/purple color whereas Gram-negative cannot be colored by crystal violet.
What is gram staining?Gram staining is the process by which bacteria are differentially colored by crystal violet in the coloration protocol, which depends on the thick strong layer of peptidoglycan present in the cell walls of Gram-positive bacteria.
In conclusion, The thick strong layer of peptidoglycans present in the cell walls of Gram-positive bacteria generates the characteristic violet/purple color whereas Gram-negative cannot be colored by crystal violet.
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describe two observation of water that provides evidence that water molecules are attracted to one another.
Water molecules are strongly attracted to each other owing to the cohesive forces.
Cohesion is the scientific term for the attraction of molecules towards other molecules of the same kind. Water molecules have significant cohesive forces as a result of their capacity to establish hydrogen bonds with one another.
When a container is filled to the brim with water, it forms a dome-like shape before it spills over the edges. The cohesive qualities of the water molecules, or their propensity to stick together, cause this dome-like shape to form.Water molecules form droplets on surfaces, such as dew drops, because their attraction to one another is stronger than that of other molecules.Light objects can float on water without sinking thanks to the surface tension caused by cohesion, such as water striders.Thus, water molecules have a strong cohesive force.
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Which of the following best describes the function of the enzyme Catalase?
Question 2 options:
Catalase is a poison produced by cells that is broken down by hydrogen peroxide
Catalase is a protein that is used by cells to slow down poisonous chemical reactions.
Catalase breaks down poisonous hydrogen peroxide into water and oxygen gas.
Catalase puts together water and oxygen gas to make poisonous hydrogen peroxide.
Catalase breaks down poisonous hydrogen peroxide into water and oxygen gas.
Functions of catalase enzymeAll enzymes, including catalase, are proteinous in nature. All enzymes also have their substrates, and they are quite specific with them. An enzyme that acts on a particular substrate may not act on another.
Catalase is an enzyme whose substrate is hydrogen peroxide. In cells, catalase helps with the homeostasis of hydrogen peroxide. Once the chemical starts building up beyond a certain concentration threshold, catalase starts breaking it down.
Catalase is able to break down hydrogen peroxide into two components - water and oxygen gas.
Thus, the option that best describes the function of the enzyme catalase is the third option.
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i want the answer please i want the answerrrr
The correct answer is "Blood should not be written on the table. Blood is basic".
Solutions are ranked according to their acidity or basicity (alkalinity) using the pH scale. The scale is logarithmic since it is based on pH values, which means that a change of 1 pH unit corresponds to a ten-fold change in the concentration of H+ ions. The pH scale is frequently stated to range from 0 to 14, while it is conceivable to have a pH below 0 or over 14. Most solutions however fall within this range. Acidic substances have a pH value less than 7 while alkaline or basic substances have a pH value greater than 7. A pH value of 7 is said to be neutral. In the example, orange juice, vinegar and hydrochloric acid have pH values less than 7. Hence, these are acidic substances. However, since blood has a pH of 7.4, it is considered as slightly basic.
Therefore, the best choice is "Blood should not be written on the table. Blood is basic".
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The lungs of an animal, shown here, exchange gases with the environment to allow for oxygen to move in and carbon dioxide to move out. The description of the function of the lungs is most similar to the explanation of what organelle within the eukaryotic cell?
A cell wall
B cytoplasm
C nucleus
D cell membrane
If you want your friend to guess whether you have a bacteria or yeast sample by answering the clues you have about their properties like shape, size, composition.
What two clues you can give to make them easily distinguish between bacteria and yeast
b. What two clues you can give them to make them confused so that they can’t. decide whether they are bacteria or plant cell
The answers include the following:
The two clues you can give to make them easily distinguish between bacteria and yeast is that yeast has a single nucleus per cell, while bacteria does not have a nucleus.The two clues which can make them confused so that they can’t. decide whether they are bacteria or plant cell is that they both possess cell wall.What is Yeast?This is an organism which belongs to the fungus kingdom and is an eukaryotic, single-celled microorganisms with the presence of one nucleus which is what differentiates it from bacteria as it possesses none.
Bacteria and yeast have cell wall which is the organelle responsible for maintaining their structural integrity while bacteria has no nucleus and yeast has one which differentiates them which is therefore the reason why it was chosen as the correct answer.
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What makes aquatic ecosystems different?
Answer:
Aquatic ecosystems perform numerous valuable environmental functions. They recycle nutrients, purify water, attenuate floods, augment and maintain streamflow, recharge ground water, and provide habitat for wildlife and recreation for people.
Cells are able to pump ions across their membranes in opposition to a concentration gradient due to
A) the destruction of electrons within the cell
B) a drop in temperature outside the cell
C) an expenditure of energy by the cell
D) a vacuole formation within the cell
Cells are able to pump ions across their membranes in opposition to a concentration gradient due to an expenditure of energy by the cell; option C.
What is active transport?Active transport refers to a form of transport that occurs in the cell in which energy is expended in the form of ATP to transport molecules from one point to the other within the cell or outside the cell.
Usually, when energy is expended in the transport of molecules, it is done against the concentration gradient.
When molecules move down their concentration gradient, they move by simple diffusion.
Therefore, cells are able to pump ions across their membranes in opposition to a concentration gradient due to an expenditure of energy by the cell.
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Which of the following are difference(s) between gram-positive bacteria and gram-negative bacteria?
are Gram-positive bacteria are all coccus and spirillus shape; Gram-negative bacteria are all bacillus shaped.???
Answer: gram negative bacteria are rod, bacillus shaped
Explanation:
gram positive are arranged in many shapes like cocci or spirillus.
Is increased brain size a Biological Characteristic?
Answer:
Yes it is
Explanation:
Since we face many problems in the future. The brain gets bigger and as we produce our kids they may have some
I think .-.
5. Have you ever noticed that the shapes
of the continents roughly fit together,
like pieces in a jigsaw puzzle? Based
on what you have learned about plate
tectonics, explain how it's possible that
the continental land masses were once
joined together but are separate now.
Comparable sorts of plants and animals have been discovered in rocks of a similar age on the beaches of separate continents, implying that the continents were formerly linked. Fossils of Mesosaurus, a freshwater reptile, have been discovered in both Brazil and western Africa.
Plate tectonics is the hypothesis that the land masses on Earth are constantly moving. Alfred Wegener proposed the concept of continental drift, or the movement of Earth's land masses.Wegener proposed that the continents shifted toward and away from each other due to the Earth's rotation. Plates are constantly moving and reacting in a process known as plate tectonics.Mountains rise where plates press together, or converge, whereas continents fracture and seas form where plates pull apart, or diverge. The continents are embedded in the plates and drift passively with them over millions of years, resulting in profound changes in Earth's geography.Thus this is the meaning of Plate tectonic.
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Biodiversity is important for the sustainability of ecosystems. However, many of the human actions that are aimed at growing communities are decreasing the biodiversity of these areas, leaving populations and ecosystems vulnerable. As human populations grow, the terrestrial and aquatic ecosystems they use may be transformed by the efforts of human beings and biodiversity losses typically accompany these processes. Which of these actions decrease biodiversity and threaten sustainability? Select ALL that apply
Pollution and Overexploitation of the natural environment are the actions that decrease biodiversity and threaten sustainability.
What factors decrease biodiversity and threaten sustainability?Climate change, Pollution, Destruction of habitats, Invasive alien species and Overexploitation of the natural environment are the actions that decrease biodiversity and threaten sustainability. Human activities can cause great damaged to the environment because human activities causes pollution which make the environment and biodiversity adversely affected. Burning of fossil produces carbondioxide which is a greenhouse gas which is responsible for the global warming and sea level rise.
So we can conclude that Pollution and Overexploitation of the natural environment are the actions that decrease biodiversity and threaten sustainability.
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Why do we use SI units in science?
Answer:
The SI system is used to exchange and sell goods all over the world. Science and research also use SI units to measure scientific quantities
Which of the following is the best title for this passage? A The Grand Canyon B Geology C Tilted Rocks D Unconformities
Find a scientific theory of your choice and summarize it below
Based on this diagram, do you think that organisms of the same order will share a stronger evolutionary relationship than
organisms that share only the same phylum? Explain your reasoning using the results of your investigation.
From the diagram above, I dont think that organisms of the same ordershare a stronger evolutionary relationship than organisms in the same phylum. This is because, after kingdoms, the subsequent categories of increasing specificity are: phylum, class, order, family, genus, and species. Levels in taxonomic classificationAt each sublevel in the taxonomic classification system, organisms become more similar.Organisms that share similar physical features and genetic sequences tend to be more closely related than those that do not. Scientists use a tool called a phylogenetic tree to show the evolutionary pathways and connections among living organisms. Phylogenetic treeA phylogenetic tree is a diagram used to reflect evolutionary relationships among organisms or groups of organismsTaxonomical classificationTaxonomy is the scientific study of naming, defining and classifying groups of living organisms based on shared characteristics. There are seven main taxonomic ranks: kingdomphylum ( in animals )or division ( in plants )classorderfamilygenusspecies.
Which action is an example of using scientific thinking to make inferences?
OA. Researching existing knowledge about the natural world
0 0 0
B. Analyzing data and observations to form conclusions
OC. Using tools or measurements to collect data
D. Asking questions and being curious about the natural world
The action which is an example of using scientific thinking to make inferences is analyzing data and observations to form conclusions and is denoted as option B.
What is Scientific method?This is referred to as the process in which facts are established and questions are answered. They are mostly used by scientists in the formulation of a theory or law and involves processes such as the following:
ObservationExperimentationHypothesisInference etc.Inference is referred to as conclusion and is done when the appropriate data and observations have been analyzed which is why option B was chosen as the correct answer.
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What is “big data” and why do we need statistics to analyze it?
Answer:
Because there is statistics only is the one of the best way to analysis of the ( big data).
A property of multiplication is used to simplify each expression. Select the property used in each simplification. A -5 ×13×6 = -5×(13×6) = -5 × 2 = -10 Commutative Property Associative Property Distributive Property B 30 × 116 = 30×(1+16) = 30 × 1 + 30 × 16 = 30 + 5 = 35 Commutative Property Associative Property Distributive Property C 25× (-8) × 10 = 25 × 10 × (-8) = 4 × (-8) = -32 Commutative Property Associative Property Distributive Property D -1.2×3×100 = -1.2×100×3 = -120 × 3 = -360 Commutative Property Associative Property Distributive Property
The property that is used for the simplification of the expression (-1.2×3×100) is the Commutative Property of multiplication.
What is multiplication?Multiplication is defined as the major type of arithmetic operations that involves repeated addition of groups of equal size.
There are various properties of multiplication which include the following:
Commutative Property: Associative Property Distributive PropertyCommutative Property: This states that when multiplying the terms through any order to simplify them, the answer will remain the same.
Therefore, 1.2×3×100 = -360
-1.2×100×3 = -120 × 3 = -360.
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Cell theory states that all living things contain one or more cells. Why do you think cell theory meets the definition of a scientific theory?
The cell theory meets the scientific unified cell theories because still there are living entities which create example for unicellular and multicellular examples.
The cell theory is known as the structural and functional unit of life because it is the smallest unit and without it, life is not possible as the cell contains the nucleus which is the brain of the cell and the unit through which hereditary material is transferred between the generations and also it contains other cell organelles responsible for all kinds of cellular functions and depending upon the number of cell the body can be simple or complex as unicellular organism like amoeba they are very simple and eukaryotes like human , fungi, protists, plants and animals all are multicellular and that is why there body is complex and cell theory meets the definition because the cell is being tested for a longer period of time and also it was given by Robert brown that cell theory are formed from the pre existing cells called as Omnis cellular and there are many theories like big bang theory which suggests that the first cell was formed from the inorganic material and this theory is also called as unified cell theory and Rudolf Virchow gave many postulates to support this theory later.
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experts believe that a good night sleep is vital to a success in school. Would kids that sleep 8 or more hours a night get better than kids who sleep less than 7 hours a night?
Sleep not only improves memory and learning, but it also has the power to prioritize memories by segmenting and arranging them according to emotional significance.
In essence, the more you learn, the more sleep you require, which is why getting a decent night's sleep is essential for doing well in school.
Many students skip sleep in order to earn good scores, yet studies show that those who sleep more often perform better academically.
Children and teenagers may struggle with attention, memory, and problem-solving skills if they don't get enough sleep.
Lack of sleep can also contribute to emotional problems and behavioral disorders that may impair academic performance. Teenagers require more sleep due to the rapid growth of their bodies and minds.
According to scientific studies, a lot of teenagers don't get enough sleep.
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IN YOUR OWN WORDS , summarize what Creutzfeldt-Jakob disease is, how it is transmitted, treated, and found.
According to the research, Creutzfeldt-Jakob disease is an infectious disease of the CNS, produced by altered prion proteins that causes advanced dementia and leads to a rapid decrease in movement.
What is Creutzfeldt-Jakob disease?It is an encephalopathy associated with a spongiform degeneration of the central nervous system (CNS) and is related to the accumulation of altered prion proteins, that is, they have lost their normal function but have acquired the ability to transform the normal form into a pathological one.
In this sense, its transmission can be horizontal or vertical and its symptoms include:
DementiaMemory impairmentMuscle coordination problemsOn the other hand, its treatment is aimed at relieving symptoms such as involuntary muscle contractions, since it is considered to lead to death given that altered prion proteins are extremely resistant to commonly used disinfectant and sterilizing treatments.
Therefore, we can conclude that according to the research, Creutzfeldt-Jakob disease is an infectious disease of the CNS, produced by altered prion proteins that causes advanced dementia and leads to a rapid decrease in movement.
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What does pH measure? Suppose a solution has a pH of 11. Is it an acid or base? Suppose a second solution has a pH of 8. What can be said about its relative acidity compared to the first solution?
How to solve?
pH measures how basic/acidic a solution is. The range is from 0-14 with 7 being neutral (not acidic or basic). 0 is the most acidic and 14 is the most basic.
A pH of 11 is basic, and a pH of 8 is relatively more acidic compared to the first solution (a pH of 8 is very close to neutral, and closer to acidic on the pH scale).
construct a food web for a hawk, snake, toads, chicken, grasshopper, termite,lizard, worms and green plants
A food web is a diagram that shows what is eaten by what in an ecological community and how food chains naturally connect to one another.
All life forms can be generically categorized by ecologists into one of two trophic levels: 1) the autotrophs, and 2) the heterotrophs. Autotrophs convert inorganic materials, such as minerals and gases like carbon dioxide, into organic matter in order to sustain their bodies, grow, develop, and reproduce.A food web's connections show the various feeding routes, such as how heterotrophs consume the organic matter produced by autotrophs and other heterotrophs to receive organic matter themselves. The different feeding strategies that connect an ecosystem into a single system of trade are depicted in a simplified way by the food web.Find the food web picture attached below.
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Salivary amylase is an enzyme found in the mouth. It breaks down starch into sugars. Why will salivary amylase NOT break down proteins?
Select one:
a.
Only sugars have the correct shape to activate the enzyme.
b.
Proteins will not fit into the active site of the amylase enzyme.
c.
Proteins do not have the proper active site for the enzyme to work on them.
d.
The enzyme is the wrong substrate for proteins.
How can reduced precipitation lead to limited water availability?
It may lead to overuse.
It makes water nonrenewable.
It contaminates current supplies.
It may lead to drought.
The way that reduced precipitation can lead to limited water availability is as follows: It may lead to drought (option D).
What is precipitation?Precipitation is any or all of the forms of water particles, whether liquid or solid, that fall from the upper atmosphere. Examples are rain, snow etc.
Precipitation is one of the major supplies of water to the Earth, hence, a reduction in the amount of precipitation (rainfall) will adversely affect the availability of water by causing drought, which is a period of unusually low rainfall.
Therefore, it can be said that the way that reduced precipitation can lead to limited water availability is as follows: It may lead to drought.
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Answer: D
Explanation: it may lead to drought
Which part of the DNA model is most directly associated with the coding of genetic information?
The linear arrangement of nucleotides in DNA contains genetic information. A hydrogen bond between the G-C and A-T base pairs holds each DNA molecule's two complementary strands of nucleotides together to create a double helix. Thus, option D is correct.
What part of DNA code for genetic information?Each sugar group has a nucleotide base, a ringed nitrogen molecule, and it is the arrangement of these bases that encodes the genetic instructions for making proteins.
Genes store the instructions needed to produce particular proteins, which are responsible for an individual's unique characteristics.
Each gene can have many alleles, or variants, that each code for a different version of the desired trait. A cell's chromosomes, which each contain several genes, are home to those genes.
Therefore, nucleotide part of the DNA model is most directly associated with the coding of genetic information.
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A classification grouping that consists of a number of similar, closely related species?
According to the research, the correct option is genus. A classification grouping that consists of a number of similar, closely related species is called a genus.
What is a genus?It is a taxonomic category that is part of systematic biology, which is located between the family and the species, that is, it includes many species that are related to each other.
In this sense, it is a taxon that allows living beings to be classified based on a hierarchy of inclusion, in this case grouping together closely related species, being a group of organisms that in turn can be divided into several species.
Therefore, we can conclude that according to the research, the correct option is genus. A classification grouping that consists of a number of similar, closely related species is called a genus.
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Label the diagram of the cell. Not sure if my answers are right so far.
Answer:
On the left... Chromatin
First of right... Ribosomes
Second... Rough endoplasmic reticulum
Third... Cytoplasm
Fourth... Lysosomes