Which of the followings pertain to element Sulfur?
A. sulfur is involved in maintaining the secondary structure of proteins
B. Sulfur is found in structure of some amino acids (proteins)
C. Sulfur is a major bio-element
D. Sulfur is found in cell wall of some bacteria
A. A, B, and C
B. A and C
C. B and C
D. A, B, D
E. A, B, C and D
Ans: C. B and C
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Harry Noller's experiments in which he extracted the ribosomal proteins and found that RNA molecules could catalyze
protein synthesis had one major flaw. What was the flaw?
a. the extraction process may have altered the RNA molecules b. protein synthesis may have occurred prior to extraction c. coenzymes, which were not extracted, might have been responsible for the reaction d. the extraction process may have altered the pH of the environment e. undetectable amounts of protein may have remained
Which type of selection will favor the intermediate form of a trait?
a. Sexual selection b. Stabilizing selection c. Mutations d. Disruptive selection e. Directional selection
In the 5-6 million years that the hominid lineage has been diverging from its common ancestor with the great apes, dozens of hominid species have arisen, often with several species coexisting in time and space. As recently as 30,000 years ago, Homo sapiens coexisted with Homo neanderthalensis. Both species had large brains and advanced intellects. That these traits were common to both species is most easily explained by which of the following?
A) species selection B) uniformitarianism C) sexual selection D) A and B only E) A, B, and C
A chemist has discovered a drug that blocks phosphoglucoisomerase, an enzyme that catalyzes the second reaction in glycolysis. He wants to use the drug to kill bacteria in people with infections. However, he cannot do this because __________.
Fill in the blank(s) with the appropriate word(s).