Question

question 37 2.5 points which of the following is not needed for gene expression? a transfer rna b ribosome c transcription d dna polymerase e rna polymerase question 38 2.5 points rna is made from 4 different nucleotides, which are read by the ribosomes three at a time. what is the total number of possible combinations? a 64 b 20 c 32 d 236 e 512

Explanation:

Question 37

Step1: Understand gene - expression process

Gene expression involves transcription (synthesis of RNA from DNA) and translation (synthesis of proteins from RNA). Transfer RNA (tRNA) is involved in translation to bring amino - acids to the ribosome. Ribosomes are the sites of protein synthesis. Transcription is the first step of gene expression where RNA is made from DNA, and RNA polymerase is used in transcription. DNA polymerase is used in DNA replication, not in gene expression.

Question 38

Step1: Use the permutation formula for nucleotides

Since there are 4 different nucleotides and they are read three at a time, the number of possible combinations is calculated using the formula \(4\times4\times4=4^{3}\).

Step2: Calculate the result

\(4^{3}=64\).

Answer:

Question 37: D. DNA polymerase
Question 38: A. 64