BIOLOGY HIGH SCHOOL

What is the process that allows DNA to make copies of itself before cell division? Where in the cell does this take place?

Answers

Answer 1
Answer: DNA replication or DNA synthesis is the process of copying a double-stranded DNA strand in a cell, prior to cell division. In eukaryotes, this is during the S phase of the cell cycle, preceding mitosis and meiosis. The two resulting double strands are identical (if the replication went well), and each of them consists of one original and one newly synthesized strand.

DNA replication occurs in the nucleus.

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The organelle that maintains pressure against the cell wall, so that the plant cell keeps it shape, is thea. central vacuole.
b. rough endoplasmic reticulum.
c. smooth endoplasmic reticulum.
d. nucleus.

Answers

a. The central vacuole. Aside from storage it also helps maintain internal pressure.

Pumps move substances ____________ a concentration gradient, a process that requires energy. Channels instead provide the means to move a substance ____________ a concentration gradient. Neurons contain the following major types of channels: • Channels that are always open, allowing continuous diffusion of a specific ion from a region of ____________ concentration to a region of ____________ concentration are leak channels. • Channels that are normally closed that open in response to the binding of a ____________ are chemically gated channels. When open, they allow a specific ion to ____________ across the plasma membrane. • Channels that are normally closed, but open in response to changes in ____________ across the plasma membrane are voltage-gated channels. When open, they allow a specific ion to diffuse across the membrane.

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The answers to the blank spaces are: against, with, higher, lower, ligand, flow, membrane potential. All answers stated respectively .

What is concentration gradient

The difference between two areas' concentrations of a material is referred to as a concentration gradient. It is the difference in concentration over a certain distance, usually between two areas of different concentrations. It could be a molecule, an ion, or another type of chemical compound.

Traveling "against" the concentration gradient entails traveling from a region of higher concentration to a region of lower concentration, while moving "with" the concentration gradient entails doing the opposite.

Learn more on concentration gradient here:

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against, down, high, low, ATP, diffuse, charges

Which of these are ions? A. anions and xenons B. anions and cations C. cations and xenons D. xenons and anions

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The correct answer is B. anions and cations 

Answer:

its b

Explanation:

because its b

How do mitosis and meiosis differ in the division of genetic composition?

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Mitosis is where the chromosome are separated in 2 identical sets of chromosomes and end up with it own nucleus. Meiosis is the division in 1/2 and then in 1/2 again causing 4 identical sets of chromosomes. Hope this helps! If something does not make sense let me know and I will be glad to explain! ;)

How does the brain size of humans compare to what is expected based on their body size? A) Human brain size is smaller than expected. B) Human brain size is larger than expected. C) Human brain size is exactly as expected. D) Human brain size is unrelated to body size.

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Answer:  (B) is correct. Human brain size is larger than expected based on their body size compared to other primates.

How might a change of one amino acid at a site, distant from the active site of an enzyme, alter the substrate specificity of an enzyme?

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Answer:

An enzyme is a protein. Any change in the primary structure of a protein (the primary structure is the aminoacid sequence) can induce a change in the secondary, as well as tertiary structure (tridimensional conformation). This change in the shape of the enzyme can affect its activity, since it can change the active site consequently to this conformational change.

Explanation:
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The sequence of an mRNA transcript is UGGCACUCCAG. What will be the sequence of the template DNA strand from which it was synthesized?A.UGGCACUCCAG B.ACCGTGAGGTC C.ACCGUGAGGUC