In Drosophila melanogaster, polytene chromosomes are produced when
A) a chromosome breaks and rejoins with another section of the same chromosome.
B) a cell divides several times before the chromosomes are duplicated.
C) chromosomes are duplicated repeatedly without a corresponding nuclear division.
D) a segment of a chromosome is duplicated during an unequal crossing-over event.
E) characteristic banding patterns form on the chromosomes.
C
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After his return to England, Darwin most pondered which question?
a. What could explain the great numbers and variety of species? b. Does the fossil evidence support uniformitarianism? c. Are the extinct and living armadillos the same species? d. Did Galápagos mockingbirds have a common mainland ancestor? e. Will natural selection work in England?
In the nitric oxide signaling pathway, nitric oxide activates an enzyme that can convert many molecules of GTP into molecules of cGMP. cGMP is a small molecule that can diffuse through the cytoplasm and bind to an enzyme called protein kinase G (PKG). Binding of cGMP to PKG leads to a change in the confirmation of PKG that leads to its activation. What type of signaling molecule is cGMP?
A. Adapter protein B. Enzyme C. Second messenger D. Scaffold
The diagram below shows the relationship between photosynthesis and cellular respiration. Which of the following statements best describes the relationship?
A) Photosynthesis and cellular respiration use light energy to produce chemical energy. B) Photosynthesis produces light energy while cellular respiration produces chemical energy. C) The reactants of cellular respiration are the reactants of photosynthesis. D) The products of cellular respiration are the reactants of photosynthesis.
Which component of the 50S subunit is believed to be responsible for catalysis?
What will be an ideal response?