QUESTION 1

What letter corresponds to the phase in which voltage-gated Na+channels are open?

action potential.pdf

A.

B.

C.

D.

E.

QUESTION 2

Which of the following statements is true about the mRNA whosestructure is depicted in the diagram shown below? mRNAschematic.pdf

A.This could be a primary transcript from a prokaryote.

B. This could be a primary transcript from a eukaryote but not aprokaryote.

C. This could be a mature mRNA from a eukaryote but not aprokaryote.

D. This could be a mature mRNA from either a prokaryote or aeukaryote

E. This could be a primary transcript from either a prokaryoteor a eukaryote.

QUESTION 3

Which of the following events are shared between mitosis andmeiosis?

A. Homologous chromosomes align

B. Random assortment of homologous chromosomes occur inmetaphase of mitosis and metaphase of meiosis II

C. Sister chromatids separate in anaphase of mitosis andanaphase of meiosis II

D. Both mitosis and meiosis have one round of replication andtwo rounds of cytokinesis

QUESTION 4

Choose the best answer below that describes components oftranscription as they are found in prokayotes and eukaryotes.

A. Sigma factor is in both, promoters are in both, and promotersare made of DNA.

B. Sigma factor is only in prokaryotes, promoters are only inprokaryotes, and promoters are made of DNA.

C. Sigma factor is only in prokaryotes, promoters are in both,and promoters are made of DNA.

D. Sigma factor is only in prokaryotes, promoters are in both,and promoters are made of protein.

E. Sigma factor is in both, promoters are in both, and promotersare made of protein.

QUESTION 5

Which of the following always occurs when a ligand binds to itsreceptor?

A. A signal is transduced.

B. A conformational change occurs in the receptor

C. Second messengers are activated

D. A and C