Boa constrictors on an island are an example of a(n) ______.

A. cell
B. organ
C. organism
D. population
E. ecosystem


D. population

Biology & Microbiology

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Which of the following types of contraception is the least effective?

A. RU486 B. the rhythm method C. condoms D. birth control pills E. All of these contraceptive methods are equally effective

Biology & Microbiology

Which of the following is NOT an amniote?

a. turtles b. frogs c. humans d. eagles e. more than one of these is NOT an amniote

Biology & Microbiology

Which of the following are exceptions to the universal genetic code that is used by most organisms? 

A. Pyrrolysine B. Selenocysteine C. Lysine D. Phenylalanine E. Stop

Biology & Microbiology

Why does it matter that HIV is a provirus?

A. Its genetic makeup is more complex than other viruses. B. It does not have to bind to living cells to survive. C. It can incorporate itself into the host cell's DNA and lay dormant for a long period. D. It is able to reproduce itself where other viruses are not.

Biology & Microbiology