A male has been tested, and his sperm seem to be normal. They are motile and seem to be surviving for the appropriate amount of time. However, the sperm don't seem to be able to fertilize an egg
What part of the sperm is most likely to be malfunctioning? A) the tail
B) the head
C) the midpiece
D) the acrosome
D
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To be considered living, an organism must minimally consist of
A. atoms and molecules. B. DNA and proteins. C. one or more cells. D. DNA and RNA. E. RNA and proteins.
Which energy-producing process is thought to have come first during cellular evolution?
a. Photosynthesis b. Glycolysis c. Oxidative phosphorylation d. All originated at the same time
Contractile vacuoles maintain osmotic balance by ________.
A. expelling water from the cell B. sensing surrounding moisture levels C. filtering ions D. drawing water into the cell
You are on the committee to update the design of the hospital NICU (neonatal intensive care unit), which currently has incubators for the babies but not much else. Based on what you have learned about Harlow's experiments with rhesus monkeys, what would you suggest adding to the NICU to improve the babies' health and well-being?
A. comfortable chairs for parents to hold their babies B. pheromones C. white-noise devices to mask the sound of beeping machines D. softer lighting