What is the effect of a nonsense mutation in a gene?

A) It has no effect on the amino acid sequence of the encoded protein.
B) It prevents introns from being excised.
C) It alters the reading frame of the mRNA.
D) It introduces a premature stop codon into the mRNA.
E) It changes an amino acid in the encoded protein.

Which of the following processes correctly describes alternative RNA splicing?

A) It increases the rate of transcription.

B) It can allow the production of proteins of different sizes and functions from a single mRNA.

C) It is a mechanism for increasing the rate of translation.

D) It can allow the production of similar proteins from different RNAs.

Which component is NOT directly involved in translation?

(A) mRNA

(B) DNA

(C) tRNA

(D) ribosomes

A mutation within a gene that will insert a premature stop codon in mRNA would _____.

What are the coding segments of a stretch of eukaryotic DNA called?

Which component is NOT directly involved in translation?

(A) GTP

(B) DNA

(C) tRNA

(D) ribosomes

You are choosing between two different prepaid cell phone plans. The first plan charges a rate of $26$ cents per minute. The second plan charges a monthly fee of $\$ 19.95$ plus $11$ cents per minute. How many minutes would you have to use in a month in order for the second plan to be preferable?

You are choosing between two different prepaid cell phone plans. The first plan charges a rate of 26 cents per minute. The second plan charges a monthly fee of $19.95 plus 11 cents per minute. How many minutes would you have to use in a month in order for the second plan to be preferable?

In what ways does the structure of RNA differ from that of DNA?

Which statement about transcription is correct?

A. RNA polymerase synthesizes DNA from a DNA template

B. RNA polymerase synthesizes RNA from a DNA template

C. DNA polymerase synthesizes RNA from a RNA template

D. DNA polymerase synthesizes DNA from an RNA template

RNA polymerase and DNA polymerase differ in that _____

A human gene was initially identified as having three exons and two introns. The exons are 456, 224, and 524 bp, whereas the introns are 2.3 kb and 4.6 kb. a. Draw this gene, showing the promoter, introns, exons, and transcription start and stop sites. b. Surprisingly, this gene is found to encode not one but two mRNAs that have only 224 nucleotides in common. The original mRNA is 1204 nucleotides, and the new mRNA is 2524 nucleotides. Use your drawing to show how this one region of DNA can encode these two transcripts.

Where in a gene would a 4-bp insertion mutation have the least effect on gene expression? a. Introns b. Exons c. Regulatory regions d. Introns and exons

Are introns and exons only in eukaryotes?