Most trees and shrubs continue to grow year after year. Such plants are known as

A) biennials.
B) perennials.
C) annuals.


Answer: B

Biology & Microbiology

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The two nitrogen atoms in nitrogen gas (N2) share six electrons forming a _____

A. hydrogen bond B. double bond C. single covalent bond D. double covalent bond E. triple covalent bond

Biology & Microbiology

A liger is a result from a male lion and a female tiger. Male ligers are usually sterile. This is an example of

A. a prezygotic mechanism. B. hybrid inviability. C. hybrid sterility. D. hybrid breakdown. E. a prezygotic mechanism and hybrid sterility are correct.

Biology & Microbiology

Which of the following diseases is not caused by an obligate intracellular pathogen?

A) chlamydial urethritis B) human monocytic ehrlichiosis C) Rocky Mountain spotted fever D) typhoid fever

Biology & Microbiology

Bacteria growing at lower temperatures have more saturated fatty acids in their membranes.

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

Biology & Microbiology