Earth's ozone layer is extremely important because it
A) traps harmful infrared rays.
B) blocks incoming UV radiation, which is damaging to animals and reduces photosynthesis in plants and algae.
C) blocks incoming visible light to protect Earth against the greenhouse effect.
D) maintains high carbon dioxide concentrations so that photosynthesis can occur.
E) traps heat so that Earth's temperature does not fall too much.
B
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What is the main reason that a person sitting on the beach with an air temperature of 15 °C loses heat less rapidly than when immersed in lake water at 15 °C?
A) Water conducts heat more efficiently than air does. B) Water evaporates, and heat is lost to evaporation. C) Metabolic heat production is greater in air than in water. D) Air is a poor insulator.
A male expresses
A. only the homozygous recessive alleles on his X chromosome. B. none of the alleles on his X chromosome. C. only the dominant alleles on his X chromosome. D. both the dominant and recessive alleles on his X chromosome. E. None of the answer choices is correct.
When a protein denatures, it ____
a. changes shape b. changes temperature c. changes pH d. binds more efficiently to its cofactor e. catalyzes reactions more efficiently
Colchicine interferes with the function of
a. microtubules. b. ribosomes. c. centrioles. d. centromeres. e. chromosomes.