Which of the following molecules is most likely to cross the cell membrane directly by passive diffusion?
A) Na+
B) fructose (a sugar)
C) a steroid hormone (a hydrocarbon)
D) insulin (a polypeptide)
E) fructose and insulin
Answer: C
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What are behaviors intended to attract a member of the opposite sex for mating?
a. intrasexual selection b. kin selection c. courtship displays d. mate-guarding
Fertilization of plant gametes produces a
a. zygote. b. gametophyte. c. spore. d. meiospore. e. multicellular haploid plant.
The wide adaptive radiation of mammals occurred during the early ____ era
a. Cenozoic b. Paleozoic c. Tertiary d. Devonian e. Jurassic
The normal habitat of ________ is rodents, but humans bitten by fleas carrying the pathogen have fever, severely inflamed lymph nodes, and headache. Later, areas of black, necrotic tissue may develop
A) Clostridium perfringens B) Yersinia pestis C) Francisella tularensis D) Borrelia burgdorferi E) Toxoplasma gondii