In CAM plants, such as cacti, stomata are ____
a. open during the night and closed during the day
b. nearly always open
c. closed only when guard cells are not exposed to sunlight
d. almost never open
e. open during the day and closed during the night
ANSWER: a
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Human telomeres form planar structures made up of quartets of
a. TTAGGG repeats. b. guanine residues. c. shelterins. d. telomerase molecules. e. TRF2 proteins.
Since viruses have no active methods of entering plant cells, they must rely upon mechanically caused wounds, vegetative propagation of plants, grafting, seed, pollen, and being carried on the mouth parts of chewing insects. Tobacco mosaic virus is most commonly introduced into plants through small wounds caused by handling and by insects chewing on plant parts. What would prevent viruses from easily entering plant cells?
a. The cell wall on the virus b. The plasma membrane on the plant c. The cell wall on the plant d. The plasma membrane on the virus e. The protein coat on the virus
A researcher hypothesizes that crocodile gender is determined by the incubation temperature of the egg. The hypothesis states that an average nest temperature of 32-33°C results in the birth of male crocodiles while cooler and higher incubation temperatures result in female crocodiles.Researchers find a group of crocodiles in which an expanded incubation temperature gives rise to male crocodiles. This particular group of crocodiles hatch male crocodiles even with incubation temperatures as low as 29°C. What type of scientific approach has led to this observation?
A. hypothesis testing B. discovery-based science
The nervous system of vertebrates has how
many divisions?
a. 1 b. 2 c. 3 d. 4 e. variable, depending on the animal