What is a characteristic of archaebacteria?
a. Most are disease-causing.
b. They live just about everywhere.
c. They use sun to produce food and energy.
d. They thrive in extreme environments.
Ans: d. They thrive in extreme environments.
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If an organism has five pairs of chromosomes, how many chromosomal combinations are possible at metaphase I of meiosis?
A. 52 B. 105 C. 510 D. 25 E. None of the answers are correct
Cellular slime molds can be distinguished from plasmodial slime molds on the basis of
a. reproductive structures. b. spore formation. c. nuclei per cell. d. slime trails. e. food requirements.
The chemical elements that are available to producers are usually in what form?
a. ions b. gases c. solids d. compounds e. hydrocarbons
Which of the following best describes the relationship between an antibody and an antigen?
a. An antibody is one response to an antigen. b. An antibody is produced by T cells and an antigen is a foreign protein. c. An antigen is presented by antigen presenting cells to plasma cells, which produce antibodies. d. An antigen is a disease-causing organism, and antibodies are produced by B cells. e. An antibody induces antigen formation.