Suppose sugar is taken out of an excretory system tubule and back into the blood. This would be an
example of
a. reabsorption.
b. release.
c. filtration.
d. secretion.
e. diffusion.
A
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In the experiment performed by Lederberg and Tatum bacteria of different genotypes had to be mixed together to obtain genetic transfer
However, Davis performed the experiment in a slightly different manner by separating cells with a filter incapable of allowing bacteria to pass. What possibility did the experiment by Davis exclude that could have occurred by the protocol used by Lederberg and Tatum? A. transformation B. conjugation C. generalized transduction D. specialized transduction
A scientist isolates a single-celled organism from the bottom of a sulfur hot spring. When examined under the microscope, it is clear that the cell is very small and contains no nucleus. Based on this evidence alone, in what domain of life is this organism?
A. Eukarya. B. Bacteria. C. Archaea. D. Either bacteria or archaea. E. It is impossible to determine anything based on this evidence alone.
The International Union for Conservation of Nature and Natural Resources (IUCN) reports that of the 48,677 species
they have assessed, ____ percent were threatened or endangered. a. 8 b. 18 c. 27 d. 36 e. 65
Which of the following statements about regulation of thyroid hormones is true?
a) TSH positively feeds back on the hypothalamus causing TRH release b) T3 and T4 negatively feed back on the pituitary to reduce TSH release c) T3 and T4 negatively feed back on the pituitary to reduce TRH release d) TSH negatively feeds back on the hypothalamus to reduce TRH release e) Both b and d are true