Where may Muller's ratchet be at work in the genomes of sexually reproducing organ-isms?
a. Y chromosome genes with female-specific function
b. Y chromosomal genes with general function
c. Autosomal genes of Drosophila males (there is no crossing-over in Drosoph-ila males)
d. Nonrecombinant sections of autosomes
e. A and B
E
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What are the sensory structures that enable invertebrates to determine the orientation of the body with respect to gravity called?
A. carotid bodies B. statocysts C. Ruffini endings D. baroreceptors E. interoceptors
Lactose is
a. a disaccharide. b. an energy source for plants. c. a polysaccharide. d. also known as table sugar. e. a form of starch.
"She is a carrier of the cystic fibrosis trait." This statement acknowledges that this person is
A. homozygous for the trait. B. heterozygous for the trait. C. trisomic. D. carrying two recessive alleles.
Which one is the power plants of a cell?
A. Nucleus B. Rough ER C. Lysosomes D. Mitochondria E. Chromosomes