Circulation in the above diagram functions primarily as a(n) ____
a. closed circulatory system
b. open circulatory system
c. semi-closed circulatory system
d. system of exchange using capillaries
e. continuous system of vessels
ANSWER: b
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Amoebic dysentery is caused by
(a) Ulva. (b) Volvox. (c) a desmid. (d) Entamoeba.
The oily secretion that lubricates the hair follicles of the skin is
A. sebum. B. eczema. C. suder. D. acne.
The grouping "conidial fungi," also known as "imperfect fungi" or deuteromycetes, is a convenience
grouping for fungi that are not classified in other groups, because the conidial fungi
a. have no known sexual phase. b. are unicellular. c. have a dikaryotic phase in their life cycle. d. have a haploid phase in their life cycle. e. lack a cell wall.
If there are 64 potential codons that code for various amino acids but only about 20 specific amino acids, what must be true about the genetic code?
A) Most of the codons are not used. B) There are two codons for each amino acid, and the rest are stop codons. C) All are used, but bacteria and plants each have 20 different amino acids. D) Multiple codons code for the same amino acid.