The long whip-like structure that helps a cell move and gather food is called a
A. flagella
B. cilia
C. false foot
D. whipper
Answer:
flagella
Explanation:
It helps the cell move
What happens to the actin and myosin during a muscle contraction?
Answer:
Once the myosin-binding sites are exposed, and if sufficient ATP is present, myosin binds to actin to begin cross-bridge cycling. Then the sarcomere shortens and the muscle contracts. In the absence of calcium, this binding does not occur, so the presence of free calcium is an important regulator of muscle contraction.
define asexual reproduction help plz
Why might there be more dissolved oxygen in a lake in Vermont than in a similar sized lake in Florida in summer? (20 points)
A.) The sandy bottoms of Florida lakes absorb dissolved oxygen better than the rocks in Vermont.
B.) The cooler water in a Vermont lake would be able to hold more dissolved oxygen.
C.) Water evaporates more slowly from Vermont lakes, leaving more dissolved oxygen in them.
D.) More rain falls in Florida in summer, diluting the dissolved oxygen in the lake.
Answer:
B
Explanation:
In summer, the temperature of Vermont is lower than that in Florida. When temperature increases, the ability will decrease. So there is more dissolved oxygen in Vermont's lake.
Answer:
B.) The cooler water in a Vermont lake would be able to hold more dissolved oxygen.
Explanation:
What were the ancestors of mitochondria according to the endosymbiotic theory?
20 points
A. Aerobic eukaryotes
B. Aerobic bacteria
C. Anaerobic bacteria
D. Chloroplasts
Answer:
d is your answer
Explanation:
Ancestors of Mitochondria were aerobic bacteria, according to endosymbiotic theory.
What is endosymbiotic theory ?According to Lynn Margulis' endosymbiotic theory, mitochondria in eukaryotes are thought to have originated via an endosymbiotic connection with purple photosynthetic bacteria around 1.5 109 years ago. The endosymbiont, which had been captured, was subsequently transformed into a useful organelle bound by two membranes. Supporting data for the endosymbiont theory.
Prokaryotic cells and mitochondria are the same size. The DNA found in mitochondria is structurally identical to bacterial DNA. Similar to bacteria, mitochondria are self-replicating cells divide by binary fission Two membranes enclose mitochondria, and the inner membrane is structurally very similar to that of bacteria.
Therefore, aerobic bacteria are the ancestors of mitochondria.
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From a single fertilized ovum undergoing a series of rapid cell divisions, a human infant develops. The embryonic cells become specialized for a variety of functions. Which of these statements best describes how different cell types develop?
A. Each cell type contains only the active parts of the DNA needed for that cell type.
B. Each cell has multiple copies of DNA that are affected in different ways by the environment to change the function of the cell at regular intervals.
C. Each cell has an identical copy of DNA with enzymes controlling the expression of specific genes, leading to a variety of cells.
D. Each cell type has only one chromosome containing thr DNA needed for that cell type.
Please help ill give you 5 star and brainliest.
Answer:
Answer is C
Explanation:
Each cell has an identical copy of DNA with enzymes controlling the expression of specific genes leading to a variety of cells
The statements 'each cell has an identical copy of DNA with enzymes controlling the expression of specific genes, leading to a variety of cells' BEST describes how different cell types develop (Option C).
Epigenetics refers to any change in gene expression that does not involve a change in the nucleotide sequence.In an organism, all somatic cells are genetically identical, thereby changes in gene expression are due to epigenetic modifications.These epigenetic modifications include DNA methylation and histone modifications (e.g., histone acetylation, histone methylation, etc).Enzymes that add specific epigenetic marks such as histone acetyltransferases alter the accessibility of transcription factors to chromatin, thereby activating or repressing gene expression.In conclusion, the statements 'each cell has an identical copy of DNA with enzymes controlling the expression of specific genes, leading to a variety of cells' BEST describes how different cell types develop (Option C).
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Please select the word from the list that best fits the definition
Brings dry, clear weather
Answer:
conduction?
Explanation:
Answer:
anticyclone/2nd one down
NEED HELP RLLY BAD
where are excessive ketones normally seen in a test?
1. blood
2. urine
3. saliva
Brainly! For the first one to answer! Answer in one paragraph.
Do you solar cells, wind farms, tidal power, hydropower and thermal energy will solve our future energy needs?
Yes, according to my point of view I strongly believes that solar cells, wind farms, tidal power, hydropower and thermal energy will solve future energy needs.
Which source of energy is common now a days?The most common energy now a days is coal and by burning fossils fuels, we are risking climate change as well as limiting our resources. Supplies won’t last forever especially at the rate we are going. By using sun, wind, and water as sources of energy, we have renewable energy which would not run out anytime as soon as we required. Those energy charges are low cost and solves pollution issues too.
Heat energy has been transferred from one place to another by three main processes and in convection, heat energy has been carried by the movement of particles of matter. In conduction, heat is transferred by particles vibrating. In radiation, heat is carried directly by electromagnetic waves.
Therefore, Yes, according to my point of view I strongly believes that solar cells, wind farms, tidal power, hydropower and thermal energy will solve future energy needs.
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Natural _______is a mechanism for the evolution of a population to become better adapted for survival in a specific environment.
Answer:
natural selection
Explanation:
Human protein X is encoded by human gene X. Gene X consists of 4 exons of 200 bp each, interspersed with introns of 1,000 bp each.
An mRNA cap will be found on ____________.
a. the primary transcript
b. the mRNA
c. at least one of the lariats
d. the poly(A) tail.
e. exon 1
f. all exons
g. some introns
Answer:
a. the primary transcript
Explanation:
The first step in RNAm maturation is the modification of the 5' end of the transcript via the addition of a structure called a cap or 7-methyl guanosine cap. The enzymes responsible for the formation of this cap are recruited to the phosphorylated C-terminal domain after the addition of the first twenty to thirty nucleotides of ARN. The formation of the cap is started by the addition of a GTP molecule oriented inversely to the 5' end nucleotide on RNA. Then methyl groups are added to this G residue and to the ribose forms of one or two nucleotides located on the 5' end. All these reactions take place in the nucleus when the mRNA is found as a primary transcript.
Which statement is evidence that the components of the genetic code are common to all organisms?
A. All animals have the same four nitrogenous bases in common with each other.
B. All eukaryotes have the same four nitrogenous bases in common with each other.
C. All living organisms have the same four nitrogenous bases in common with each other.
D. All prokaryotes have the same four nitrogenous bases in common with each other.
Answer:
C. All living organisms have the same four nitrogenous bases in common with each other.
Explanation:
Because all living organisms have the same 4 nitrogenous bases in common with each other but different sequences.
SOMEONE PLZ HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
Explanation:
the nucleus , it contain chromatin reticulum which later forms the DNA
Which helps in the production of eggs?
testosterone
estrogen
semen
fallopian tube
Answer:
Semen helps in the production of eggs!
answer:
... semen...
explanation:
i'd be embarrassed to explain that bit
SOMEONE PLZ HELP!!!!!!!!!!!!!!!
Answer:
A
Explanation:
these minerals are formed through crystallization of molten materials which statement best describes these two minerals?
the mineral on the left formed from lava
the mineral on the right formed from magma
the mineral on the left has smaller crystals in the middle on the right
the mineral on the left cool more slowly than the mineral on the right
Answer:
The answer is D.
Explanation:
Just took the quiz and got it correct.
The correct statement is that the mineral on the left cool more slowly than the mineral on the right
The crystallization process is simply known as the way through which atoms are arranged to form a material with a crystal structure.
A ways minerals is formed is by:
Crystallization of magma or lava
The minerals that forms igneous rocks often solidify or freeze at different temperatures.
Magma are created underground, in the lower crust or upper mantle, due to the intense heat there.
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how to get sick with fever fast
Answer: Over exhaust your self and stay up for two days no sleep.
a metacentric chromosome is one that has a centrally located centomere and chromosome arms with approximately equal length. which of the human chromosomesare metacentric
Answer:
Human chromosomes 1 and 3
Explanation:
There are four types of chromosomes classified based on the position of their centromere. These chromosomes are metacentric, submetacentric, acrocentric and telocentric. As rightly stated in this question, metacentric chromosome is the chromosome that has a centrally located centomere making the chromosome arms to be approximately of equal length.
The metacentric type of chromosomes are present in humans as viewed using KARYOTYPE (a pictorial display of chromosome arrangement). Based on karyotyping, chromosomes 1 and 3 are METACENTRIC.
In which form food is stored in the leaves? Comment
the answer is starch
Explanation:
food is stored in the leaf in form of starch in plants
Suppose we stock a pond with 100 fish and note that the population doubles in the first year (with no harvesting), but after a number of years, the population stabilizes at what we think must be the carrying capacity of the pond: 2,000 fish. Growth seems to have followed a logistic curve. a. What population size should be maintained to achieve maximum yield, and what would be the maximum sustainable fish yield? b. If the population is maintained at 1,500 fish, what would be the sustainable yield?
Answer:
Explanation:
From the given information,
The first process is to determine the initial growth rate by using the formula:
[tex]R_o = \dfrac{In(2)}{t_d}[/tex]
where;
The initial growth rate(constant) = [tex]R_o[/tex] ; &
the doubling time = [tex]t_d[/tex] = 1 year
[tex]R_o = \dfrac{In(2)}{1 \ year}[/tex]
[tex]R_o[/tex] = 0.693 / year
Now, we move up to the net stage to find the growth constant by using the formula:
[tex]r = \dfrac{R_o}{(1 - \dfrac{N_o}{K})}[/tex]
where;
[tex]N_o[/tex] = population of fish in the pond = 100
[tex]R_o[/tex] = The initial growth rate(constant) = 0.693 /year
K = carrying capacity = 2000
Then;
[tex]r = \dfrac{0.693 \ /year }{(1 - \dfrac{100}{2000})}[/tex]
[tex]r = \dfrac{0.693 \ /year }{(1 - 0.05)}[/tex]
[tex]r = \dfrac{0.693 \ /year }{(0.95)}[/tex]
r = 0.730 / year
a)
Now, the maximum yield can be evaluated by using the expression:
[tex]= \dfrac{rk}{4}[/tex]
[tex]= \dfrac{0.730 \times 2000}{4}[/tex]
= 365 fish per year
Also, the maximum sustainable yield is said to be half of the carrying capacity suppose that the population growth obeys logistic curve;
i.e.
[tex]N' = \dfrac{1}{2} \times 2000[/tex]
N' = 1000 fish
b)
If the population is maintained at 1500 fish;
The sustainable yield can be calculated by using the formula:
The Sustainable yield = [tex]r\times N (1 - \dfrac{N}{K})[/tex]
The Sustainable yield = [tex](0.730/ year ) (1500) (1 - \dfrac{1500}{2000})[/tex]
The Sustainable yield = 1095 × 0.25
The Sustainable yield = 273.75 fish per year
The Sustainable yield ≅ 274 fish per year
Population size should be maintained to achieve maximum yield and Sustainable yield if population is maintained at 1,500 fish are 364.7 , 273.525 fish per year
Sustainable yield:Given that;
Stock in start = 100 fish
Double in 1 year
Capacity of pond = 2000 fish
Find:
Population size should be maintained to achieve maximum yield
Sustainable yield if population is maintained at 1,500 fish
Computation:
Growth rate = ln₂ / 1
Growth rate = 0.693 per year
With no growth constraint r = [tex]\frac{0.693}{1-\frac{100}{2000} }[/tex]
With no growth constraint r = 0.7294 per year
A. Population size should be maintained to achieve maximum yield = [tex]\frac{0.7294 \times 2000}{4}[/tex]
Population size should be maintained to achieve maximum yield = 364.7 fish per year
B. Sustainable yield if population is maintained at 1,500 fish = [tex][(0.7294))(1500)][1-\frac{1500}{2000} ][/tex]
Sustainable yield if population is maintained at 1,500 fish = 273.525 fish per year
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Describe the resting state of a neuron.
Doctors are investigating the case of a patient with defective proteins.
Which organelle is most likely the cause?
A. lysosome
B. cell membrane
C. cytoplasm
D. ribosome
Answer:
Answer is D
Explanation:
I also took the test as well and got 100% on it
From how many stem cells does cell division take place in meiosis?
Answer:
They probably divide to make EITHER two stem cells, OR two more specialized cells.
Explanation:
The region in a plant that is analogous to animal stem cells, and can develop into various types of tissues and organs, is the ______.
he root system includes those parts of the plant below ground, such as the roots, tubers, and rhizomes. Plant cells are formed at meristems, and then develop into cell types which are grouped into tissues
PLEASE HELP ME WITH THIS QUESTION
Answer:
Animal- Eukaryotic
Plant- Eukaryotic
Bacteria- Prokaryotic
Fungi- Prokaryotic
Protist- Prokaryotic
I'm not 100% happy with my answers so don't take my word on it that they will be 100% correct.
But anyway, Hope this is good.
A teacher asked her students to transcribe a DNA sequence into a complementary RNA strand. She gave the students the following DNA code: AGC TTA GGC. Which student created the correct RNA strand?
Student 1
CUG AAC UUG
Student 2
AGC UUA GGC
Student 3
TCG AAT CCG
Student 4
UCG AAU CCG
Question 4 options:
a.student 3
b.student 2
c.student 1
d.student 4
Answer:
student 4 bcoz thymine is replaced by uracil in RNA
Answer:Student 4
Explanation:
In humans, earlobes that are suspended (detached) are dominant over those that are attached. If a mother has suspended earlobes (but her mother did not) and the father has attached earlobes, what are the chances that their first child will have attached earlobes?
Answer:
i would say it is a 50/50chance
Explanation:
3. When a single-celled organism splits into 2 new organisms it is called _________________. *
a.fission
b.budding
c.fragmentation
d.sporulatioin
Answer:
When a single-celled organism splits into 2 new organisms it is called fission.
When a single-celled organism splits into 2 new organisms it is called fission. Therefore, option (A) is correct.
What is binary fission?In biology, fission is the split of a single organism into two or more pieces, followed by the regeneration of those parts into new, distinct organisms that resemble the original. Cells are often the thing that undergoes fission, although the phrase may also describe how creatures, bodies, populations, or species divide into distinct sections.
Asexual reproduction in bacteria occurs via a mechanism called binary fission. A single organism splits into two separate ones during binary fission. The duplication of organelles in eukaryotes is sometimes referred to as binary fission.
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which is a characteristic of pseudoscience
resistance to change
continually changing
involves a step-by-step method
updated by new technology
Answer:
a
Explanation:
i took the test
Cell _________
is the process by
which cells divide
Answer:
Cell cycle
Explanation:
Mitosis is a process of nuclear division in eukaryotic cells that occurs when a parent cell devides to produce two identical daughter cells.