Which of the following enzymes converts chemical bond energy to light energy in bioluminescent organisms?
a. oxyluciferin
b. luciferase
c. pepsin
d. luciferin
b
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Which of the following statements about the causes of extinction are true? Check all that apply.
_____ Probability of extinction varies inversely with population size. _____ Ten 10-hectare habitat patches is not the same as one 100-hectare patch. _____ Habitat loss is currently the major cause of extinction. _____ The prehistoric megafauna of North America were spared from extinction because they coevolved with humans. _____ Probability of extinction is greatest for an endemic species.
Cholesterol
a. has a rigid backbone of four carbon rings. b. is the most common sterol in animal tissue. c. is a lipid without a fatty-acid component. d. is needed to produce sexual development and maturity. e. is all of these.
Which of the following regarding antimicrobial control agents is FALSE?
A) Contaminating organic debris such as blood or sputum will decrease effectiveness. B) Some agents kill by denaturing microbial cell proteins. C) Some agents affect microbial cell membranes by dissolving lipids. D) Some agents are utilized as both an antiseptic and a disinfectant. E) A true antimicrobial control agent is equally effective against both bacteria and viruses.
The incidence of Down syndrome increases _____.
A) when identical twins or triplets have been conceived B) both parents are heterozygous for Down syndrome C) if either of the parents is aneuploid D) for families with Down syndrome in their pedigree E) once the mother's age is greater than 35