HIV has 9 genes in its RNA genome. Every HIV particle contains two RNA molecules, each molecule containing all 9 genes. If, for some reason, the two RNA molecules within a single HIV particle do not have identical sequences, then which of these terms can be applied due to the existence of the non-identical regions?
A) homozygous
B) gene variability
C) nucleotide variability
D) average heterozygosity
E) all except A
Answer: E) all except A
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Miniature chromosomes composed of several genes in double-stranded, closed, circular structures are called:
a. transposons. b. insertion sequences. c. plasmids. d. chromatoids.
A network of interactions that involves the cycling of materials and the flow of energy between a community and its physical environment is a(n) ____
a. population b. community c. ecosystem d. biosphere e. species
Four of the five choices listed below are
characteristics of phloem. Select the exception. a. consists only of cell walls b. characterized by channels across plant cell walls c. sieve plates found between some cells d. includes accessory companion cells e. transports sugar
If an amphibian zygote is manipulated so that the first cleavage plane does not divide the gray crescent, what is the expected fate of the two daughter cells?
A) The daughter cell with the entire gray crescent will die. B) Both daughter cells will develop normally because amphibians are totipotent at this stage. C) Only the daughter cell with the gray crescent will develop normally. D) Both daughter cells will develop abnormally. E) Both daughter cells will die immediately.