Which of the following describes a cytotoxic autoimmune reaction?
A) Antibodies react to cell-surface antigens.
B) Antibodies are not made.
C) Cells are killed.
D) Immune complexes form.
E) Mediate by T cells.
A
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All of the following are diameters of cells that would be resolved in a microscope with a limit of resolution of 0.2 µm except ________.
A. 2.0 µm B. 0.2 mm C. 0.1 µm D. 0.2 µm
Behavioral traits are useful in distinguishing among species because
a. behaviors are always genetically determined. b. courtship behaviors and timing of mating may create prezygotic isolation. c. behaviors are easy to assess in dead and fossilized specimens. d. behaviors are independent of morphological characteristics. e. behaviors are always learned
How might a single base insertion into the second codon of the coding sequence of a gene affect the amino acid sequence of a protein encoded by the gene?
A) A single amino acid could change. B) The amino acid sequence would be altered. C) The mutation may have no effect on amino acid sequence. D) A single extra amino acid would be present in the protein. E) All of the above are possible outcomes.
Why are green algae placed in the kingdom Protista, while plants are given their own kingdom?
A. Green algae have a cell wall of chitin, while plants have cell walls of cellulose. B. Plants enclose and protect the embryo within the female plant, while green algae do not. C. All plants are vascular, while all green algae are nonvascular. D. The green algae use chlorophyll a, while plants use chlorophyll b. E. Algae are sporophytes that reproduce only asexually, while plants are gametophytes and reproduce sexually.