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 midpiece B) the acrosome C) the tail D) the head


Answer: B

Biology & Microbiology

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Tobacco mosaic virus can be transmitted between individual plants by biting insects.

Answer the following statement true (T) or false (F)

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Which of the following are examples of associative learning? (Check all that apply.) 

_____ classical conditioning _____ cognition _____ imprinting _____ operant conditioning _____ Pavlovian conditioning

Biology & Microbiology

Which chemical condition describes the electrons in a water molecule being shared unequally between the hydrogen and oxygen atoms?

A) hydrophobic B) ionic C) noncovalent D) polar

Biology & Microbiology

How are covalent bonds in the cell rapidly broken?

A.) by energetically molecular collisions with potassium ions B.) by enzyme catalysis that is specific between protein and substrate C.) by energetically molecular collisions with water molecules D.) by the large electrical force across membranes

Biology & Microbiology