Which of the following are carcinogens?

A. Sunlight
B. Tobacco
C. Xrays
D. all of the above


Answer: D. all of the above

Biology & Microbiology

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The strands in a double helix of DNA are:

A. antiparallel B. complementary C. held together via hydrogen bonds D. wound around each other with 10 base pairs per turn E. antiparallel, complementary, held together via hydrogen bonds and wound around each other with 10 base pairs per turn

Biology & Microbiology

Hyponatremia is a condition characterized by low sodium in the blood. This is a concern for marathon runners who drink too much water, and can cause life-threatening pressure on the brain. Why would this occur?

A. Neurons would take up the sodium from the blood and not be able to polarize. B. Neurons would be stimulated to all fire at once. C. Neurons would swell by osmosis. D. Neurons die in low levels of sodium. E. Neurons cannot give the kidneys signals to reabsorb sodium ions.

Biology & Microbiology

Myrmechochores are ants that are attracted to the seeds of certain plants

Indicate whether the statement is true or false

Biology & Microbiology

What type of RNA carries amino acids to the ribosome?

complementary RNA messenger RNA ribosomal RNA double-stranded RNA transfer RNA

Biology & Microbiology