The function of which of the following structures is NOT directly related to diffusion or active transport across its membranes?
(A) Aorta
(B) Small intestine
(C) Nephron tubule
(D) Capillary
(E) Alveolus
Answer: (A) Aorta
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The figure below depicts a human embryo. The cells in the inner cell mass (indicated by the arrow) are:
A. totipotent
B. pluripotent
C. multipotent
D. unipotent
E. omnipotent
Using a specific chemical, a cell biologist has blocked one type of channel-linked receptor in a lab rat's liver tissue. What was the likely mechanism of the chemical she used?
A. The chemical prohibits ions from entering the cell via active transport. B. The chemical prohibits second messenger signaling. C. The chemical prohibits binding of a ligand to the receptor. D. The chemical causes ions to move in the opposite direction of the ion gradient.
Which of the following molecules is/are produced by translation? Include molecules that are subject to further modification after initial synthesis.
A. The amino acid glycine B. RNA polymerase C. Aminoacyl-tRNA synthetase
The most common type of mutation is a point mutation.
Indicate whether the statement is true or false.