The initiation of translation in archaea ________.
A. employs fMet-tRNAifMet the same as bacterial cells, but proceeds in a mechanism similar to eukaryotes
B. employs fMet-tRNAifMet and proceeds in a mechanism similar to bacterial cells
C. employs Met-tRNAiMet and proceeds in a mechanism similar to eukaryotic cells
D. employs Met-tRNAiMet the same as eukaryotic cells, but proceeds in a mechanism similar to bacteria
Answer: D
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During the late 1800s, which of these technological developments contributed the most to scientific knowledge of the role played by chromosomes in inheritance?
a. radiocarbon dating b. early DNA sequencing c. improvements in microscopy d. mass spectrometry
Which of the following differentiates marshes and swamps from bogs?
a. Marshes and swamps have no moving water. b. Bogs are devoid of plant life. c. Bogs have very little or no moving water. d. Marshes and swamps have more insect life than bogs.
Which of the following is true regarding the concept of biomagnification?
a. Toxic materials that biomagnify are lost just as energy is lost from a natural system. b. Toxic materials that biomagnify often accumulate in fat tissues of animals. c. Toxic materials that biomagnify become more concentrated as they move up a food chain. d. b and c e. a and b
Your friend examines an ivy vine growing on the side of a campus building and says, "Look - some of the branches on this plant have a different morphology. The leaf shapes and patterning are different, and there are flowers on some branches but not others. There must have been a mutation!" You respond,
A. "No, those branches have just undergone phase change. Now they're in the adult form, and have become competent to respond to flowering signals." B. "No, those morphological changes are just evidence that this plant's environment has changed during its lifetime." C. "I think you're right. Maybe there was a mutation in the LEAFY (LFY) gene, and the loss of LFY has promoted flowering and had pleiotropic effects on leaf morphology." D. "I think you're right. Maybe the embryonic flower (emf) gene is being overexpressed, and that's causing flowers to form."