Which of the following is NOT a major function of proteins in living organisms?
a. speeding up biological reactions
b. transporting substances across membranes
c. providing structural support
d. regulating the activity of other cellular molecules
e. storing genetic information
E
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Which of the following is a transfer of genes between non-homologous chromosomes?
A) Translocation B) Inversion C) Duplication D) Deletion
Which of the following is in the correct sequence?
a. the origin of self-replicating molecules -> the abiotic synthesis of small molecules -> the abiotic synthesis of polymers -> packaging of molecules into protobionts b. packaging of molecules into protobionts -> the abiotic synthesis of small molecules -> the abiotic synthesis of polymers -> the origin of self-replicating molecules c. the abiotic synthesis of polymers -> the abiotic synthesis of small molecules -> packaging of molecules into protobionts -> the origin of self-replicating molecules d. the abiotic synthesis of small molecules -> the abiotic synthesis of polymers -> packaging of molecules into protobionts -> the origin of self-replicating molecules
You are a veterinarian working for the San Diego Zoo. Today, you are performing an autopsy on a 22.7-gram frog and a 21.2-gram lizard, both of which appear to have died of a respiratory infection
Why are you not surprised to find that the lungs of the lizard have a larger internal surface area than those of the frog? A) The lizard is larger than the frog. B) Lizards have a higher metabolic rate than frogs. C) Lizards lay shelled eggs on land, whereas frogs lay jelly-like eggs in water. D) Lizards have dry, scaly skin, whereas frogs have thin, moist skin. E) Lizards are more susceptible than frogs to atmospheric pollutants.
Some cells have aquaporins—channels that facilitate the flow of water molecules through the plasma membrane. For these cells, what regulates the rate and direction of water diffusion across the membrane?
(a) aquaporin conformation (b) resting membrane potential (c) solute concentrations on either side of the membrane (d) availability of ATP