Asthenozoospermia is a medical condition that is characterized by reduced sperm motility. What structure of the sperm is likely affected in a man who has asthenozoospermia?

A) acrosome
B) head
C) middle piece
D) flagellum


Answer: D

Biology & Microbiology

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DNA in the nucleus winds around proteins called

A) histones. B) karyosomes. C) ribosomes. D) proteasomes.

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Combined DNA Index System (CODIS) is

A) a fifteen-base DNA sequence used in DNA profiling. B) a type of mutation used in forensic applications. C) a system for crime laboratories to share DNA profiles. D) a technology used to amplify DNA found at crime scenes.

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All other factors being equal, the renaturation of the three classes of complementary nucleic acid sequences occurs in what order, from fastest to slowest?

What will be an ideal response?

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What is happening when a neuron is at rest before an action potential?

A) The membrane is depolarized. B) Membrane ion channels are open. C) Potassium is diffusing out of the cell. D) The inside of the neuron is negative relative to just outside the neuron.

Biology & Microbiology