How many times per minute does the average human heart beat?
a. 120
b. 72
c. 53
d. 10
Ans: b. 72
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Which geological time period of Earth’s history is commonly referred to as the Coal Age?
a. Carboniferous b. Cretaceous c. Devonian d. Jurassic e. Permian
What is a key difference between autotrophs and heterotrophs?
a. Autotrophs harvest energy directly from the environment. b. Autotrophs do not require carbon. c. Autotrophs mainly break down organic compounds. d. Autotrophs harvest energy from decomposing organisms e. Autotrophs are consumers.
The Cholodny-Went hypothesis has been proposed to explain how plants bend toward a directional light source. What does this hypothesis suggest?
A. Plants use phototropins to receive a blue-light signal. B. The tip of the plant shoot is important for bending. C. Auxin is produced in cells in response to light and causes bending. D. Asymmetric auxin distribution causes differential cell elongation that causes bending.
Fraternal twins (dizygotic) result from the fertilization of
a)two eggs and two sperm. b)two eggs and one sperm. c)one egg and two sperm. d)one egg and one sperm. e)two eggs and one sperm OR one egg and two sperm.