The presence of oxygen inhibits the germination of Clostridium botulinum endospores.
A) True
B) False
A) True
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The main pollinators of flowers that have markings visible only under ultraviolet light are
A. birds. B. bees. C. beetles. D. flies. E. bats and moths.
What happens to the ATP molecule after it has been used to do work?
A) It breaks down into carbon dioxide and water. B) It is split into two molecules of pyruvic acid. C) It loses a phosphate group and is converted to ADP. D) It is completely destroyed.
Tobacco smokers (and those exposed to tobacco smoke) are at greater risk of an ectopic (tubal) pregnancy. Based on your understanding of the structures of the cytoskeleton, what is the BEST explanation?
A) Tobacco interferes with the microtubule network of eggs thus weakening their structure. B) Tobacco interferes with the functioning of the flagella propelling sperm. C) Tobacco interferes with microfilament formation in sperm, thereby forcing the zygote to implant in a fallopian tube. D) Tobacco interferes with the sweeping motion of cilia that aids in the movement of the egg toward the uterus.
Signal molecules that determine relative positions during development are known as
A. morphogens. B. organizers. C. inductors. D. cadherin domains. E. derepressers.