The absorption of external organic matter by bacteria is called:
a. heterotrophy.
b. autotrophy.
c. tertiary.
d. osmotrophy.
e. omnivory.
D
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Which subatomic particles are found outside the nucleus of an atom?
a. Neutrons b. Protons c. Electrons d. Photons
Comparisons between the cytochrome b protein sequence in the honeycreeper versus the deer mouse and the Gough
Island finch reveals eighteen and four amino acid differences, respectively. Therefore, _____.
a. the honeycreeper is more closely related to the deer mouse b. the honeycreeper and the Gough Island finch are the same species c. the honeycreeper is more closely related to the Gough Island finch d. no DNA mutations have occurred during the evolution of the honeycreeper e. the DNA sequences of all three species are identical
Several species of sea urchins may inhabit the same tide pool and their reproductive periods overlap. Although they practice external fertilization, they seldom interbreed because eggs produce chemicals that are only attractive to sperm of their own species. This is an example of a ________ barrier that ________.
A. prezygotic; prevents gamete fusion B. prezygotic; causes temporal isolation C. prezygotic; causes geographic isolation D. postzygotic; prevents zygote fusion E. postzygotic; causes hybrid infertility
Which of the following statements about T lymphocytes is FALSE?
A) T lymphocytes produce antibody molecules. B) T lymphocytes directly attack cells and produce the cell-mediated immune response. C) T lymphocytes are called such because they mature in the thymus. D) T lymphocytes have TCRs that recognize antigen only if it is bound to MHC. E) There are three types of T lymphocytes.