Question

question 2

1. which of the following environmental factors is more likely to cause nucleotide mutations?

proper nutrition
lack of water
cold temperatures
ultraviolet (uv) radiation
question 3
10 pts
if an mrna strand has the sequence acg - gcc - uau, what would be the dna template strand used to make it?
aua - cgg - acg
ugc - cgg - aua
acg - gcc - tat
tgc - cgg - ata

Explanation:

Question 2

Ultraviolet (UV) radiation is a mutagen. Mutagens are agents that can cause mutations. UV radiation can damage the DNA structure (e.g., forming thymine dimers), leading to nucleotide mutations. Proper nutrition is beneficial for normal cellular functions and does not cause mutations. Lack of water and cold temperatures can stress cells but are not as directly mutagenic as UV radiation in terms of causing nucleotide - level changes in DNA.

In transcription, mRNA is synthesized from a DNA template strand. The base - pairing rules are: A (adenine) in mRNA pairs with T (thymine) in DNA, U (uracil) in mRNA pairs with A (adenine) in DNA, G (guanine) in mRNA pairs with C (cytosine) in DNA, and C (cytosine) in mRNA pairs with G (guanine) in DNA.
For the mRNA sequence ACG - GCC - UAU:

• For the first codon ACG: A in mRNA pairs with T, C pairs with G, G pairs with C. So the DNA codon is TGC.
• For the second codon GCC: G pairs with C, C pairs with G, C pairs with G. So the DNA codon is CGG.
• For the third codon UAU: U pairs with A, A pairs with T, U pairs with A. So the DNA codon is ATA.

Answer:

Ultraviolet (UV) Radiation

Question 3