Which statement describes a home heating and cooling system that functions in a homeostatic way?
A. The temperature always stays the same.
B. The heater never comes on.
C. The heater is on at a constant rate.
D. The thermostat keeps the temperature within a narrow range.
D. The thermostat keeps the temperature within a narrow range.
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Imagine you have discovered a new species of bacteria. To begin your investigation of this organism, you run an assay on the total nucleotide content of the bacterial cells
If the cytosine content of DNA from the bacterial cells is 17%, what is the adenine content? A. 17% B. 34% C. 66% D. 33% E. It is impossible to calculate this number for eukaryotes.
The persistence of the sickle-cell anemia allele in some African populations is the result of ____
a. a high rate of mutation of the normal allele to the sickle-cell anemia allele b. the advantage of the heterozygous form over the homozygous forms c. nonrandom mating d. a decline in the occurrence of malaria in Africa e. genetic drift
The process in which carbon from an inorganic source, such as carbon dioxide, gets incorporated into an organic molecule is called ____________.
A. carbon fixation B. the Calvin–Benson cycle C. light-dependent reaction D. metabolic regeneration E. phosphate-group transfer
Which organisms exist in a plasmodial form that is a diploid cytoplasmic mass?
A. sporozoa B. zooflagellates C. slime molds D. diatoms