CH3-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2-COOH is a(n)
A. fatty acid.
B. amino acid.
C. glycerol.
D. steroid.
A. fatty acid.
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In which of the following structures does fertilization typically take place?
A. fallopian tubes B. ovaries C. uterus D. cervix E. vagina
What is the molecular basis of touch sensation?
A. Pressure on the skin squeezes out chemical signals from epidermal glands. B. Cell membrane distortion opens touch receptors, creating a receptor potential. C. Pressure damages the delicate strands of skin cell DNA, activating a complex signalling cascade. D. Pressure on sensory axons bursts vesicles and causes neurotransmitter release.
Which statement about cloning vectors is false?
a. Bacteriophage cloning vectors can accommodate DNA fragments up to 23 kb. b. Cloning vectors are molecules capable of transporting a DNA fragment into a cell. c. Plasmid cloning vectors can accommodate DNA fragments up to 20 kb. d. Bacterial artificial chromosomes can accommodate fragments up to 200 mb. e. Cosmid cloning vectors combine the features of both bacteriophages and plasmids.
In some instances environmental change causes a situation where one phenotype is favored for a period of time, and then a different phenotype is favored. This oscillating selection causes
A. extinction of the population. B. an increase in point mutations. C. the maintenance of genetic variation in the population. D. high population increase to maintain phenotypic variation. E. elimination of rarer genotypes because of uneven selection.