How many hydrogen bonds are there between cytosine and guanine?
a. none
b. one
c. two
d. three
d
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“Efficiency” of a respiration pathway refers to the
(a) number of steps in the pathway. (b) amount of CO2 produced relative to the amount of carbohydrate entering the pathway. (c) amount of H2O produced relative to the amount of carbohydrate entering the pathway. (d) amount of ATP energy produced relative to the energy content of the carbohydrate entering the pathway.
Embryonic development begins with a single egg fertilized by a single sperm, forming a zygote which then divides by
mitosis. How many cells are present in the embryo at the conclusion of four mitotic divisions?
a. 2 b. 4 c. 8 d. 16 e. 32
Cells called ____ are a type of vascular tissue that join end to end in tubelike columns. They develop
thick, lignified cell walls and die at maturity, leaving a water-conducting tube. At maturity the ends of the cells are open or have large openings, allowing for enhanced water flow compared to other types of vascular tissue.
a. sclerenchyma b. tracheids c. collenchyma d. parenchyma e. vessel members
Your sister calls to say that the light will not go on in her bedroom. You say that you think the bulb must be burned out, and therefore, replacing the bulb will solve the problem. In doing so, you are:
A. making observations that might lead to a hypothesis of why the light will not go on. B. stating a specific hypothesis for why the light does not go on, and a prediction. C. performing an experiment to test a hypothesis of why the light will not go on. D. stating a hypothesis for why the light will not go on.