Anchovies are an efficient fish to catch because they:
a. are grazers.
b. are filter feeders.
c. travel in large dense schools.
d. are small fish.
e. swim quickly.
C
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Which one of the following is least likely to cause mutations in DNA?
A) aflatoxins that are found in moldy grains B) hydroxyl radicals formed as by-products of aerobic respiration C) ultraviolet radiation from sunlight D) light from an incandescent bulb
Which of the following is the role of calcium-dependent protein kinases?
A. receptor molecule B. affector molecule C. messenger molecule D. effector molecule E. all of the choices
In an experiment, a scientist isolates mitochondria from living cells and suspends them in two different buffered solutions. One solution is maintained at ph 4, while the other solution is maintained at ph 9. the scientist finds that mitochondria in the solution at ph 4 continue to produce atp but those in the ph 9 solution do not. The results of the experiment can be used as evidence in support of which of the following scientific claims about mitochondrial activity
A. mitochondria in a cell-free environment are unable to convert thermal energy into atp, B. the electron transport chain pumps electrons from the cytosol to the mitochondrial matrix C. atp production in mitochondria requires a hydrogen ion gradient that favors movement of protons into the mitochondrial matrix D. atp synthase molecules change their orientation in relation to the proton gradient across the mitochondrial membrane
Which of the following characteristics helps differentiate between a monocot and a dicot?
A) Presence or absence of pollen grains B) Presence or absence of an apical meristem C) Seeds covered by a fruit D) Number of flower parts E) Presence of vascular tissue