Natural killer (NK) cells that destroy virus-infected cells and cancer cells are
A. large granular lymphocytes.
B. eosinophils.
C. neutrophils.
D. suppressor T cells (TS).
Answer: A
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How do exposed layers of sedimentary rock in the Grand Canyon reveal clues about the geologic time scale?
a. The chemical composition of each layer indicates the conditions on Earth when the layer was deposited. b. Fossils of soft-bodied animals are prevalent in sedimentary rock. c. Radiometric dating using 14C of fossils in each layer can accurately predict their age up one million years ago.
d. The chemical composition of each layer can be determined by radiometric dating. e. The oldest fossils are found near the surface, while the most recent fossils are found at deeper layers.
Which variable has the stronger influence on the color of an individual's skin?
A. the individual's phenotype B. the individual's genotype C. the amount of time spent in the sun and the individual's genotype D. the amount of time spent in the sun E. Neither the sun nor the individual's genotype have any influence on the individual's skin color.
Balanced polymorphism is a type of
a. disruptive selection. b. sexual selection. c. directional selection. d. reproductive isolation. e. stabilizing selection.
The energy parasite Chlamydia is known to:
a. eradicate males from a population. b. convert males into females. c. cause infected females to lay eggs that develop without fertilization. d. reduce the number of males in a population. e. lack peptidoglycan in cell wall