Give an example of exaptation in humans. What will be an ideal response?
ANSWER: Our opposable thumbs are an example of exaptation. The opposable thumb evolved as a
mechanism to grasp branches and support the arboreal existence of our ancestors. The same
thumb and finger arrangement made possible the use and production of tools in our more
recent ancestors.
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Give an explanation for the fact that athletes’ resting heart rates are usually slower than the average rate for healthy humans.
What will be an ideal response?
Which statement related to gymnosperm reproduction is true?
A. Many gymnosperms rely on insects for pollination. B. Gymnosperms, like ferns, alternate generations. C. Gymnosperm reproduction is so inefficient that gymnosperms do not grow very tall or live for very long. D. Spores produce pollen grains, which contain sperm.
Dietary glucose is transported into a cell against its concentration gradient with the aid of membrane proteins called Na+/glucose_____.
a) aquaporins b) channel proteins c) receptor proteins d) symporters e) antiporters
In order to be acted on by sexual selection, what is required of a trait?
A) It must be something that influences mate choice by the opposite sex. B) It must be something that increases survival. C) It must be a male trait. D) It must be a trait that increases fertility.