During the process of gas exchange, gases move ____
a. by active transport
b. down electrical gradients
c. through membrane channels
d. by facilitated diffusion
e. down partial pressure gradients
ANSWER: e
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Upon chemical analysis, a particular polypeptide was found to contain 100 amino acids. How many peptide bonds are present in this protein?
A) 101 B) 100 C) 99 D) 98 E) 97
The movement of substances to regions of lower concentration is called
A. active transport. B. diffusion. C. pinocytosis. D. pumping. E. exocytosis.
If an action potential persists for one minute or longer, an increase in the strength of synaptic connections develops
Which term describes the resulting establishment of memory between two neurons?
a. lateralization b. consciousness potentiation c. long-term potentiation d. long-term association e. cephalization association
The blastopore is the ____
a. opening of the archenteron at the animal pole b. opening of the archenteron at the vegetal pole c. outer layer of the blastula d. cavity in the blastula formed by invagination e. region of the blastula establishing dorsal-ventral polarity