The portion of a mature sperm that contains enzymes needed for fertilization is the ____
a. head
b. midpiece
c. body
d. tail
e. acrosome
ANSWER: e
Biology & Microbiology
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Social behavior between animals where the actor benefits at the expense of the recipient is called ________
A) mutual benefit B) selfishness C) altruism D) spite
Biology & Microbiology
Which structure or structures function to open and close the stomata?
a. cuticle b. mesophyll c. palisade cells d. guard cells e. chloroplasts
Biology & Microbiology
You analyze a blood sample taken from a man who survived for 2 days in the desert with no water to drink. Based on your knowledge of kidney physiology, you are not surprised to find that his blood level of ADH is
A) higher than normal. B) lower than normal. C) zero. D) normal.
Biology & Microbiology
Which of the following is an immature fern leaf?
a) petiole b) frondule c) featherhead d) fiddlehead e) sorus
Biology & Microbiology