A small infectious agent that contains a nucleic acid genome packaged inside a protein coat is called a:
A. bacteria
B. virus
C. tRNA
D. archaea
B
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The number of sperm cells in an ejaculation averages
A) 2,000 to 6,000. B) 20,000 to 60,000. C) 200 to 600 million. D) 200 to 600 billion.
In bilateral animals, _____ is contained within a cavity, cushions the gut during body movements, and is a means by which materials are distributed throughout the body
a. a coelom b. mesoderm c. a mantle d. a water-vascular system e. coelomic fluid
What does the ozone layer absorb?
a. heat b. pollution c. ultraviolet radiation d. infrared radiation e. oxygen
You are investigating the structure of the seeds of a newly discovered tropical plant. There is storage material inside the seed. You treat the seed with peptidase (an enzyme that breaks peptide bonds),
glycoside hydrolases (an enzyme that breaks ? glycosidic bonds), and amylase (an enzyme that breaks ? glycosidic bonds). Only the amylase appears to dissolve the storage material in the seed. What does this tell you about the identity of the storage material? A) The seed contains fibrous proteins to store carbon and energy. B) The seed contains lipids to store carbon and energy. C) The seed contains starch to store carbon and energy. D) The seed contains cellulose to store carbon and energy. E) The seed contains globular proteins to store carbon and energy.