Why is hypertension common among elderly people?
a. It arises from years of improper diet.
b. It is due to constant exposure to chronic diseases.
c. As blood vessels age, blood vessels stiffen and lose flexibility.
d. Risk factors tend to increase with increasing age
C
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A sequence of bases in the middle of an RNA used to encode a polypeptide has the sequence UUA—AUG—CGU. Is it possible to infer the sequence of the amino acids encoded by this RNA?
A) Yes, the sequence is Leu—Met—Arg.
B) Yes, the sequence is Asn—Tyr—Ala.
C) No, this RNA sequence could encode more than one amino acid sequence.
D) No; the sequence of amino acids in polypeptides is not related to the sequence of bases in RNA.
The flow of ____ and the cycling of ____ maintains nature’s organization
a. water; populations b. atoms; energy c. nutrients; water d. energy; materials e. raw materials; water
________ are blood vessels that move blood away from the heart.
Fill in the blank(s) with the appropriate word(s).
Which of the following is a direct result of depolarizing the presynaptic membrane of an axon terminal?
A) Voltage-gated calcium channels in the membrane open. B) Synaptic vesicles fuse with the membrane. C) The postsynaptic cell produces an action potential. D) Ligand-gated channels open, allowing neurotransmitters to enter the synaptic cleft.