identify the steps in the scientific method that correspond to hunt's experiments is
Observation: Mice in plastic cages that had been treated with strong soap had eggs that had cell division issues that resulted in genetic abnormalities.
Hypothesis: Exposure to bisphenol A affects the prevalence of genetic defects in mice.
Prediction: Mice exposed to high amounts of bisphenol A will have an increase in the incidence of genetic anomalies.
What is Morgan hunt's experiment?
Morgan's arguments against the Mendelian and chromosomal theories were very different. Both hypothesized cellular structures or substances that somehow regulate developmental processes in an effort to explain biological occurrences. This reminded Morgan too much of the preformation theory, which held that the adult is already fully formed in the egg or sperm and dominated embryology in the late 18th and early 19th centuries.
Morgan contended in 1909 and 1910 that no single chromosome could contain particular hereditary qualities, despite the fact that he acknowledged that the chromosomes might have something to do with heredity. Additionally, he asserted that Mendelian theory was completely hypothetical because it was unable to define the actual processes of heredity, despite being able to explain and even forecast breeding outcomes.
For Morgan, the fact that each pair of chromosomes divides and that each chromosome thereafter enters a different sperm or egg cell in precisely the same way as Mendelian factors did not seem to be sufficient evidence to support the idea that the two processes are related.
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What is the major difference between positive and negative feedback A positive feedback causes to continue of negative feedback cause it to stop or start B positive feedback results in temperature increases while negative feedback results in temperature decreases C positive feedback stimulates body system so while negative feedback shuts down body systems D positive feedback is controlled by external factors while negative feedback is controlled by internal factors
Answer:
A positive feedback causes to continue of negative feedback cause it to stop or start
Explanation:
A positive feedback occurs to help increase the output or increase the changes. While a negative feedback occurs to decrease or reduce the output or decrease the change. A positive feedback amplifies the results of any reaction to make the reaction more quickly and the negative feedback results in a reaction to reduce the system to its original state or stable state. Thus a positive feedback occurs to continue while negative feedback causes it to stop or to start.
Mendel crossing plants problem :
which one is the answer and why?
Explanation:
I believe it's a hybrid cross
13. Write a flow chart for Aerobic respiration starting from Glucose to
carbon dioxide) and water(H2O).Mention major in between steps.
Answer:
Aerobic respiration occurs in the steps:
Glycolysis--> respiration--> ETC
(see images for flow chart)
Explanation:
The mitochondria inside the cell's cytoplasm is an organelle. It consists of a gel-like material comprising an outer membrane, an inner membrane, and a matrix. In mitochondria, cells break down sugars in the form of glucose during aerobic respiration, in the presence of oxygen...
This occurs via glycolysis, the Kreb's cyle, and the electron transport chain (ETC)
C6H12O6 (glucose) + 6 O2 → 6 CO2 + 6 H2O + ≅38 ATP
glucose + oxygen → carbon dioxide+ water+ energy
can someone pls help me with this i have no clue
b. Label the tetrad with the following terms: tetrad, centromere, sister chromatids, nonsister chromatids
A= B = C = D =
Answer:
a= Tetrad B=Non Sister chromatids C= Centromere D= Sister Chromatids
Explanation:
A cell with 30% solute is in an environment that consists of 25% solute. Which statement is true?
A.water will move both into and out of the cell equally.
B. Water will move into the cell.
C. Water will move out of the cell.
Answer:
Hypotonic solutions are those with less solute (again read as higher water potential). Isotonic solutions have equal (iso-) concentrations of substances. Water potentials are thus equal, although there will still be equal amounts of water movement in and out of the cell, the net flow is zero.
Pure liquid water has a pH of 7, which means that water is
OA. a base
O B. polar
O C. neutral
OD. an acid
The pH scale is from 1-14 and if the water is on 7, it would make it a neutral substance (C).
Identify the reactants in the following chemical equation:
6 H2O + 6 CO2 → C6H12O6 + 6O2
Answer:
[tex]6H_2O + 6CO_2[/tex]
Explanation:
The reactant is always at the left side of chemical equations. Thus, the reactants are 6H2O and 6CO2.
Hope this helps.
What two characteristics are useful for supporting the photosynthetic mode of energy generation found in euglenids?.
Answer:
An eyespot ( or photoreceptor) and a flagellum are useful for supporting the photosynthetic mode of energy generation found in euglenids
Explanation:
What use does the eyespot serve in euglena?
Near the reservoir, one can observe an eyespot on a euglena's anterior end. It can sense light. This supports euglena in locating sunny areas where they may capture sunlight for food preparation.
Euglena has two flagella one flagellum is very short and can not be seen clearly while the second one is large and can be observed. Flagella help euglena in locomotion or movement purposes and also in sensing environment. Flagella also help euglena in photosynthesis. While Euglena uses its flagellum to walk about in looking for food at night, Euglena contains chloroplasts and can do photosynthesis during the day.
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Which organisms are most closely related?
Answer:umm a and b
Explanation:
how do scientist use index fossils
Answer: Fossils are used to determine the ages of rock layers. Index fossils are of organisms that lived over a wide area.
Answer:
Fossils are used to determine the ages of rock layers. ... Index fossils are of organisms that lived over a wide area. They lived for a fairly short period of time. An index fossil allows a scientist to determine the age of the rock it is in. I really hope this helps.
How are the agriculture experts important for the nation
Answer:
Most of the world’s poor are farmers, and those who are not spend much of their income on food. Transforming a country’s agriculture sector can create jobs, raise incomes, reduce malnutrition, and kick-start the economy on a path to middle-income growth.
Explanation:
Messenger RNA is the carrier of information from DNA to the ribosomes in the cytoplasm, where proteins are synthesized. The RNA
is transcribed from a DNA template. A special enzyme is involved in separating the two strands of the DNA molecule apart and
then hooks the RNA nucleotides together as they base pair along the DNA template. The special enzyme involved in this process is
called
A)
DNA primase
B)
DNA polymerase
RNA polymerase.
D)
helicase.
a promoter
Answer:
b.) DNA polymerase
Explanation:
Answer:
Helicase (D.)
Explanation:
I am 100%sure that the answer is D because helicase is the enzyme that unzips dna. Also, I know this because I just took the usatestprep quiz and got this question right.
-yw
structure and protective devices of the egg of the mosquito culex pipiens. journal ofinsectphysiology
The structure and protective devices of the egg of the mosquito Culex pipien include double sheet in the outer covering of the egg shell and a genetic liquid drop on the posterior pole of the body respectively.
Mosquitoes are insects belonging to the family Culicidae and are known to transmit various life-threatening diseases like filariasis, zika fever, yellow fever, malaria and dengue. Three significant genera of mosquitoes are Anopheles, Culex and Aedes.
The mosquito belonging to genus Culex is known to transmit viral encephalitis and filariasis. These mosquitoes can lay eggs on the surface of any fresh water body, whether flowing or stagnant. They have a life cycle of around 10 to 14 days, and even longer in winter.
Culex pipiens is the most common domestic mosquito species found in northern regions. The eggs of this species are found in direct contact with the external atmosphere. The outer shell of the egg has two sheets enclosing the air between them. They have a drop of liquid on the posterior pole of their body. It protects them from predators such as ants.
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guysss please help it’s due at 3:00 pleaseeeeee
Answer: i would say 47
Explanation:
Answer:
47
Explanation:
trust
a population of rodents, called population a, lived on a large landmass. one group of the population dispersed to a nearby island. two million years later, the island population split into two smaller, equal-sized populations when a river formed across the middle of the island. now two new species, a1 and a2, have evolved on the island. they have replaced the population from which they were derived.
Phylogenetics is the study of populations that have evolved over time. The evolutionary growth of an organism or of a generic group of organisms is referred to as phylogeny.
A phylogenetic tree, or tree diagram that shows how one taxon is directly or distantly connected to another taxon, is used to represent the evolutionary relationships. Phylogenetics evaluates anatomical or molecular traits and searches for patterns of relatedness. In order to demonstrate the evolutionary links between the various organisms, phylogenetic trees can be thought of as the physical representation of these ideas. Phylogenetic classification methods arrange species or other groupings in ways that correspond to how we understand how they descended from a common ancestor.
According to the supplied statement, rodents were able to attain identical population level after two million years, which can be explained using the theory of phylogeny.
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Which is biotic?
soil
leaf
water
snow
Answer:
A leaf is a biotic.Explanation:
Please mark my answer as a brainliest ❤❤❤A biotic components from the given options of soil, leaf, water, snow is leaf
A leaf is a part of a plant and all plants are living thing. They possess all the characteristics of living things
What are biotic components?Biotic components of an ecosystem are all the living organisms present in the system.
They include all animals and plants Biotic components also include the micro-organisms and waste from living things and dead organismsLearn more about biotic components:
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in the absence of recombination, how many genetically different types of gamete can an organism with five homologous chromosome pairs produce?
In the absence of recombination, an organism with the five homologous chromosome pairs can produce 32 genetically different types of gametes.
Given that,
Number of chromosome pairs = n= 5
Here recombination is absent.
Thus, the number of gametes produce is given by 2^n.
By substituting the values, we will get,
Number of gametes produce without recombination =2^5 = 32 .
Hence, the number of gametes produce without recombination when an organism with 5 homologous chromosomes pairs is 32 gametes .
What is recombination?It is the process of producing new alleles by the recombination of DNA molecules.
There is a transfer or exchange of genetic material occurs between the two gametes.
Recombination are of two types i.e. homologous recombination and non-homologous recombination.
Homologous recombination occurs between chromosomes of same sequence of genetic material.
Alleles:A pair of genes controlling the same character and located at the same locus in the homologous chromosome are known as alleles.
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Each example of rock weathering can be categorized as either physical weathering or chemical weathering. Drag each item to the correct location. (2 points)
Answer:
Here are the answers
Explanation:
Physical Weathering:
Wind blowing off bits of rock over time
A prairie dog burrowing a hole in a rock
An insect digging a hole in rock for its home
Chemical Weathering:
Limestone in rock dissolving when acid rain flows across it
Bits of iron in rock rusting when exposed to oxygen and water
certain metals in rock oxidizing by exposure to air
I hope this is right
In a food chain the flow of energy is Always___.
one-way
reversible
two-way or
uncontrolled
Which sentence best describes how matter moves through an ecosystem?
A. Matter is made by producers and is destroyed when eaten.
B. Matter only moves from consumers to producers.
C. Matter only moves from producers to decomposers.
D. Matter is continually cycled through an ecosystem.
Reset
Answer:
D
Explanation:
Matter can not be created or destroyed.
Matter is passed throughout the ecosystem through life and death.
Question 10 (3 points) Which statement about energy is true for all living things? Plants convert energy into ATP? Energy cannot transfer from one organism to the next? Energy comes only from sunlight? Organisms require energy for survival?
Explain how buming fossil fuels can lead to a lower ocean pH
Answer:
By letting the fossil die in the sea in let sit for a long time
Explanation:
Compare what happens to chromosomes during anaphase 1 and anaphase 2
Answer:
Compare what happens to chromosomes during anaphase I and anaphase II. In anaphase I the two pairs of chromatids of each similar pair move away from each other to opposite ends of the cell. In anaphase II the centromere divides and the chromatids separated and move to opposite ends of the cell.
Explanation:
hope it helps, please mark as brainliest
In anaphase I the two pairs of chromatids of each similar pair move away from each other to opposite ends of the cell. In anaphase II the centromere divides and the chromatids separated and move to opposite ends of the cell.
Credits to the other person
protoporphyrin ix fluorescence and photobleaching during interstitial photodynamic therapy of malignant gliomas for early treatment prognosis
Prior to therapy, a high PpIX fluorescence was observed in three patients; however, after iPDT, this fluorescence was entirely photobleached. These patients' viable tumor sections had high PpIX concentrations (mean PpIX uptake per tumor: 1.4-3.0 M).
Briefing:However, no or just minimal PpIX uptake (0-0.6 M) could be seen in the remaining two cases. Strong PpIX uptake patients demonstrated therapeutic response and long-term clinical stabilization (no progression at 29, 30, and 36 months); the remaining two patients experienced early treatment failure (death after 3 and 9 months).
Describe fluorescence:Two steps make up the chemical process of fluorescence first, a chemical fluorophore such a protein or carotenoid absorbs shorter-wavelength light (excitation), and then some of the absorbed energy is released as longer-wavelength light (emission).
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How do trees improve water quality?
a.
Tree roots anchor soil in place, preventing runoff.
b.
Water is filtered as it passes through the root systems of trees.
c.
An adult tree can store nearly 250 gallons of water.
d.
All of the above
Please select the best answer from the choices provided
A
B
C
D
Answer:
B - Water is filtered as it passes through the root systems of trees.
Explanation:
Water is filtered as it passes through the root systems of trees. So, the correct option is (B).
What are Trees?A tree is defined as a perennial plant with a tall stem, or trunk, usually supporting branches and leaves where the tree may be narrower consisting of woody plants with only secondary growth, such plants Those that are usable as timber or are plants above a specified height.
Trees are described as large and tall plants with very thick, woody and rigid stems called trunks. This single main stem or stem gives rise to many branches which bear leaves, flowers and fruits.
Trees improve water quality by a process called soil erosion which prevents sediment from entering storm drains and streams, filtered through the root system of trees
Thus, Water is filtered as it passes through the root systems of trees. So, the correct option is (B).
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which example illustrates the difference a between community and a poopulation
Answer:
All the different kinds of animals in a zoo would be a community. All of the gorillas in the zoo would be a population.
(Does that make sense to you?)
Explanation:
Community- multiple different species in a place.
Population- a single species in a place.
I'm sorry, but the way you spelled population has me crying XDD
Have a nice day! :)))
What type of muscles alternate between contracting and relaxing? a) Involuntary muscles b) Antagonistic muscles c) Agonist muscles d) Isotonic muscles
Answer:
b
Explanation:
women over 35 years of age have an increased risk of nondisjunction due to errors in what phase of meiosis?
Answer: Women over 35 years of age have an increased risk of nondisjunction due to errors in what phase of meiosis? nondisjunction is the failure of chromosomes to separate properly during anaphase I of meiosis or the failure of sister chromatids to separate properly during anaphase II of meiosis.
Explanation:
Which of the following does a weather station model demonstrate?
altitude
air mass
air density
temperature
Answer:
temperature
Explanation:
Fermentation does not produce ATP. Why is fermentation such an important process in cells
Answer:
In humans we go through Lactic Acid Fermination
Explanation:
It is important because after glycolysis we have the elctron carrier NAD+ reduced to NADH and we cant continue glycolysis until we have NADH back to NAD+ so all lactic acid fermintation does it removed the electron and allow glycolysis to continue. It should be noted that fermintation occurs when there is no oxygen / not enough to continue cellular respiration so we rely on glycolysis to produce very little ATP while oxygen is replenished,