Most trees and shrubs continue to grow year after year. Such plants are known as
A) biennials.
B) perennials.
C) annuals.
Answer: B
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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
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.
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
Bacteria growing at lower temperatures have more saturated fatty acids in their membranes.
Answer the following statement true (T) or false (F)