The correct number of chromosomes is maintained during sexual reproduction by:
a. a process by which one half of the chromosomes in gametes are removed.
b. chromosome doubling in the newly formed zygote.
c. meiosis, which reduces the chromosome number by half.
d. mitosis, which maintains the original chromosome number.
e. replication of chromosomes twice during meiosis
C
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A bacterium that uses CO2 as an electron source but CANNOT use it as a carbon source is considered a mixotroph
Indicate whether the statement is true or false.
A change in behavior related to a stimulus and response is
A. aversiveness. B. associative learning. C. habituation. D. orientation. E. aversiveness and habituation.
What result would you expect if a mutation eliminates one of the four arms of a tRNA?
A) The tRNA will fit into the A site but will not release the peptide at the P site. B) The tRNA will not be recognized by tRNA synthetase and cannot be charged. C) The tRNA will be charged with the wrong amino acid. D) The tRNA will not be able to undergo traditional complementary base pairing. E) There will be no effect on function, so long as the anticodon region is intact.
The observations of Hooke and van Leeuwenhoek documenting the existence of microscopic cells formed the basis of what important theory?
a. the germ theory of disease and causative agents b. the theory of spontaneous generation, which held that life forms could arise spontaneously c. the theory of chemotherapy, or use of antimicrobials to destroy pathogenic organisms d. the cell theory, stating that all living things are composed of cells