Which of the following reactions is catalyzed by a ribozyme?
A. Last step in electron transport chain (reduction of O2 to form H2O).
B. Attachment of amino acid to transfer RNA
C. Peptide bond formation during protein synthesis
D. First reaction in glycolysis (phosphorylation of glucose)
Answer: C
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Diseases constantly present in a population are called
A. epidemic. B. chronic. C. latent. D. endemic.
Which is the chemical bond formed when an electron is shared between two elements?
a. Ionic bond b. Covalent bond c. Electronic bond d. Hydrogen bond
Why was the X-ray diffraction photography of Rosalind Franklin and Maurice Wilkins considered critical evidence in the study of DNA?
A. The photographs indicated that DNA has a double helix structure. B. The photographs showed the bases of DNA were held together by hydrogen bonds. C. The photographs revealed the structure of the deoxyribose sugar. D. The photographs showed the location of each adenine, guanine, cytosine, and thymine. E. The photographs showed equal numbers of purines and pyrimidines.
Allopatry occurs when _________________.
a) populations become separated geographically. b) populations exchange alleles by migration. c) populations become two separate species. d) populations go extinct.