Which stage in cellular respiration directly requires the presence of O2?
A. Glycolysis
B. The Krebs cycle
C. Electron transport
D. Both a and b are correct.
Ans: C. Electron transport
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A female cat in heat urinates more often and in many places. Male cats are attracted to the urine deposits. Which of the following is a proximate cause of this increased urination?
A) It announces to the males that she is in heat. B) Female cats that did this in the past attracted more males. C) It is a result of hormonal changes associated with her reproductive cycle. D) The female cat learned the behavior from observing other cats.
The earliest species known to reproduce sexually was a
a. cyanobacterium. b. green alga. c. fungus. d. red alga. e. archaebacterium.
What type of chromosome structure is commonly found in hyperthermophiles?
What will be an ideal response?
Assuming that all of the flagella found among the various types of protists require the same amount of ATP per unit time to operate, and assuming that all of an individual protist's flagella are in use simultaneously, then which of these protists should use the greatest amount of ATP per unit time to move about?
a. Chlamydomonas b. dinoflagellates c. euglenids d. diplomonads e. golden algae