Contractions of the dome-shaped __________ and

the intercostal muscles between the ribs alter the
volume of the thoracic cavity during breathing. Fill in the blank(s) with the appropriate word(s).


Answer: diaphragm

Biology & Microbiology

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In humans, the volume of an egg is 100 times the volume of a sperm. Compared to the amount of chromosomal DNA in an egg, the amount of chromosomal DNA in a sperm is

A) variable but usually less than one-hundredth that of the egg. B) exactly one-hundredth that of the egg. C) one-fourth that of the egg. D) one-half that of the egg. E) equal to that of the egg.

Biology & Microbiology

The primary structure of a protein is

A) an alpha helix or a pleated sheet. B) the amino acid sequence of the polypeptide chain. C) composed of two or more polypeptide chains. D) maintained by hydrogen bonds.

Biology & Microbiology

Plants are raised under artificial lights turned off and on by an electric clock. Some are given long periods of light, others short periods. This is an example of:

A. deductive reasoning B. a hypothesis C. inductive reasoning D. an experiment E. a theory

Biology & Microbiology

Stem cells are used in which of the following techniques?

a. therapeutic cloning b. development of genetic markers c. DNA profiling d. recombinant DNA technology

Biology & Microbiology