________ consist of proteins and RNAs that associate, providing both a physical support and enzyme activity for protein synthesis.
A) Nucleosomes
B) Ribosomes
C) Nuclei
D) Histones
B) Ribosomes
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Which of the events listed below occurs in the light reactions of photosynthesis?
A) NADP is produced. B) NADPH is reduced to NADP+. C) Carbon dioxide is incorporated into PGA. D) ATP is phosphorylated to yield ADP. E) Light is absorbed and funneled to reaction-center chlorophyll a.
Among the bryophytes, which of the following contain distinct stemlike axis, small leaves, and rootlike rhizoids?
A. liverworts B. hornworts C. mosses D. algae E. cycads
Copper has an atomic number of 29 and a mass number of 64. What would result if an uncharged copper atom lost 2 electrons?
a. The atom would have a double negative charge and be an ion. b. The atomic number would be reduced to 27 , the mass number would remain 65 and the atom would be an anion with a +2 charge. c. The atomic number would remain 29, the mass number woul be reduced to 62 and the atom would be an anion. d. The atomic number would remain 29, the mass number would remain 64 and the atom would be a cation with a +2 charge.
Fly species W, found in a certain part of the island, produces fertile offspring with species Y. Species W does not produce fertile offspring with species X or Z. If no other species can hybridize, then species W and Y
A) are still sibling species. B) shared a common ancestor more recently with each other than either did with the other two species. C) may merge into a single species if their hybrids remain fertile over the course of many generations. D) A and B only E) A, B, and C