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3 years ago

What are the five steps of genetic expression?

Biology

2 answers:

4vir4ik [10]3 years ago

8 0

Answer:

1. Transcription – conversion of DNA to RNA

2. Post-transcriptional modifications

3. RNA transport

4. Translation or protein synthesis

5. Protein folding

White raven [17]3 years ago

6 0

1 Initiation. The DNA molecule unwinds and separates to form a small open complex. RNA polymerase binds to the promoter of the template strand.

2 Elongation. RNA polymerase moves along the template strand, synthesising an mRNA molecule. In prokaryotes RNA polymerase is a holoenzyme consisting of a number of subunits, including a sigma factor (transcription factor) that recognises the promoter. In eukaryotes there are three RNA polymerases: I, II and III. The process includes a proofreading mechanism.

3 Termination. In prokaryotes there are two ways in which transcription is terminated. In Rho-dependent termination, a protein factor called "Rho" is responsible for disrupting the complex involving the template strand, RNA polymerase and RNA molecule. In Rho-independent termination, a loop forms at the end of the RNA molecule, causing it to detach itself. Termination in eukaryotes is more complicated, involving the addition of additional adenine nucleotides at the 3' of the RNA transcript (a process referred to as polyadenylation).

4 Processing. After transcription the RNA molecule is processed in a number of ways: introns are removed and the exons are spliced together to form a mature mRNA molecule consisting of a single protein-coding sequence. RNA synthesis involves the normal base pairing rules, but the base thymine is replaced with the base uracil.

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KonstantinChe [14]

The answer to this question would be: hypertonic, hypotonic

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4 years ago

Use the scenario to answer the question.

soldier1979 [14.2K]

The independent variable would be a. concentrations of ethylene spray

In virtually all scientific investigations that seeks to establish a cause-and-effect relationship, there are usually two main variables involved:

Independent Variable: This is the variable that is manipulated by the researcher to cause or establish the extent of the effect it will have on the dependent variable that is being studied. It is the cause.
Dependent Variable: This is variable that is measured by the researcher. It is the effect which is dependent on the independent variable.

In the scenario given, different concentrations of ethylene spray, is what the researcher manipulates, while the length of ripening time, is what is measured by the researcher.

The the length of ripening time is dependent on the different concentrations of ethylene spray. Therefore:

the length of ripening time is the dependent variable
the concentrations of ethylene spray is the independent variable.

Learn more about dependent and independent variables here:

brainly.com/question/23700645

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3 years ago

White feathers in canaries are dominant to yellow feathers. A heterozygous canary is crossed with a homozygous recessive canary.

Lera25 [3.4K]

2:4 homozygous recessive; 50% heterozygous.

Explanation:

I will be using the letter B to represent dominant alleles and b to represent recessive alleles.

If a canary is heterozygous, that means that it will have (Bb). Hetero, means different, so it will never be both (BB) or (bb).

If the other canary is homozygous recessive, it will be (bb). Homo, means the same, so it will never be (Bb). If the canary were homozygous dominant, it would be (BB).

I made a Punnett square to figure out the ratio and the percentage that is being asked in the question. As you can see, if you bring down the alleles from both of the parents accordingly, you will get...

2:4 of the offspring will be potentially homozygous recessive.

50% of the offspring will be heterozygous.

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3 years ago

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Luke can use this information to sort the photos into four batches excluding the time period when it is not possible for all participants to be in the photo.

<h3>How are fossils dated?</h3>

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With this information, we can conclude that Luke can use this information to sort the photos into four batches excluding the time period when it is not possible for all participants to be in the photo.

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2 years ago

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3 years ago

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