The conifers, such as pines and junipers, are examples of:
a. gymnosperms
b. angiosperms
c. bryophytes
d. lycophytes
e. seedless vascular plants
a
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Occasionally, chromosomes fail to separate during meiosis, leading to daughter cells that have an abnormal number of chromosomes. This phenomenon is called
A. epistasis. B. nondisjunction. C. crossing over. D. pleiotropy. E. chromosome inactivation.
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.
Which of the following help to release carbon from dead organisms?
a. Fungi b. Saprobes c. Pseudopodia d. Parasites
The only endocrine gland whose secretory function is under direct control by sympathetic nerves is the:
a. pancreas b. thyroid c. adrenal medulla d. thymus e. testis