In humans, the presence or absence of dimples is a trait controlled by a single gene. What is the genotype of an individual who is heterozygous for dimples?
A) DD
B) Dd
C) dd
D) DI
B
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How does habitat fragmentation affect biodiversity?
a. As long as the fragments are of good quality habitat, biodiversity will not be affected. b. Habitat fragmentation increases biodiversity because it reduces entry of exotic species. c. Habitat fragmentation is a threat to biodiversity because small habitat patches sustain only small populations. d. Habitat fragmentation increases biodiversity because adaptation to local conditions stimulates evolution. e. Habitat fragmentation connects terrestrial and aquatic habitats.
Mannitol salt agar is selective for Staphylococcus aureus because this organism
A. is often resistant to methicillin. B. can withstand high salt concentration. C. is unique in its ability to ferment mannitol. D. can tolerate brief exposures to high temperature. E. can synthesize catalase.
Dysplasia occurs when an abnormal structural change occurs in a cell
Indicate whether the statement is true or false
Nearly all food plants are ________
A) bryophytes B) gymnosperms C) ferns D) angiosperms