Cells take in and get rid of substances in various ways. Which process requires the expenditure of energy?
A) passive transport
B) diffusion
C) active transport
D) osmosis
Ans: C) active transport
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Two frog populations (same species) living in two neighboring lakes sing slightly different courtship songs. Increased irrigation makes the land between the two lakes wetter, allowing frogs to expand their ranges to the area between the lakes
Females in both populations prefer loud frogs to quieter frogs, but do not distinguish between the two slightly different songs. Assuming that courtship song differences have a genetic basis, predict what will likely happen to the songs of the two frog populations. A) The songs will become more similar to each other. B) Males will become louder. C) Disruptive selection will cause the songs to differentiate even more. D) Genetic drift will cause the songs to differentiate even more. E) You cannot predict a change in the courtship songs at the two lakes.
In breast tumors the presence of multiple copies of the HER2 gene is correlated with a more aggressive cancer
Which of the following methods would allow comparison of different cancer cells to determine which have more copies of the HER-2 gene? A. PCR with primers that contain restriction sites B. RT-PCR C. quantitative PCR D. PCR with conventional primers E. All of these choices are correct.
Charcot-Leyden crystals are often observed in specimens infected with which one of the following trematodes?
a. Clonorchis (Opisthorchis) sinensis b. Opisthorchis viverrini c. Fasciola hepatica d. Paragonimus westermani
In eukaryotic cells, the enzymes involved in the tricarboxylic acid cycle (Kreb's cycle) are located
A. in the cristae. B. in the outer mitochondrial membrane. C. in the inner mitochondrial membrane. D. in the matrix of the mitochondria. E. in the cytoplasm.