Which of the following is a unique characteristic of viruses that distinguishes them from the other major groups of microorganisms?
A. Cause human disease
B. Cannot be seen without a microscope
C. Lack a nucleus
D. Lack cell structure
E. Contain genetic material
Answer: D
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The hemocyanin of arthropods and molluscs differs from the hemoglobin of mammals in that _____
A) the oxygen dissociation curve for hemocyanin is linear B) hemocyanin carries appreciably more carbon dioxide C) hemocyanin has protein coupled to copper rather than to iron D) the protein of hemocyanin is not bound to metal E) hemocyanin includes cyanic acid
Which greenhouse gas also destroys the ozone layer?
a. chlorofluorocarbons b. carbon dioxide c. nitrous oxide d. methane e. oxygen
People with a large amount of which tissue are
least likely to be sensitive to cold? a. cartilage b. adipose c. blood d. dense connective e. bone
The structure that makes loose connective tissue flexible is
a. collagen. b. adipose tissue. c. jellylike ground substance. d. calcium salts. e. elastic fibers.