Chloroplasts are thought to have originated as
endosymbiotic associations when aerobic
bacteria engulfed photosynthetic cells. This
relationship was favored by the production of
____ by the endosymbiont.
a. glucose
b. hydrogen ions
c. ATP
d. oxygen
e. water
D
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Why do many plants use the photoperiodic pathway to regulate the timing of flower formation?
A. Flower petals carry out high levels of photosynthesis and require high light conditions. B. A minimum amount of light is always necessary for flowering. C. This allows plants to link flowering to temperature, which corresponds to the season when conditions are optimal. D. This allows plants to link flowering to day length, which corresponds to the season when conditions are optimal.
Individuals, such as veterinarians, who work closely with farm animals treated with antibiotics tend to carry ____ as a
result.
a. lethal bacteria b. bacteria vulnerable to all antibiotics c. bacteria vulnerable to some antibiotics d. bacteria resistant to Flavomycin® but not vancomycin e. more antibiotic-resistant bacteria
A cointegrate is characteristic of replicative transposition
Indicate whether the statement is true or false
If there are 32 sister chromatids in a normal somatic cell, how many chromosomes are there?
A. 32 B. 64 C. 16 D. 8