Which of the following enzymes joins DNA strands, joins Okazaki fragments, and mends gaps in the DNA backbone during excision repair?
A. RNA polymerase
B. DNA polymerase
C. DNA ligase
D. DNA gyrase
Ans: C. DNA ligase
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Ribosomes can catalyze formation of peptide bonds. This supports the hypothesis that _____
a. an RNA world preceded DNA-based genomes b. RNA can hold more information than DNA c. the first protists had RNA as their genetic material d. RNA's only role is that of an enzyme e. protocells contained DNA
The technique of preparing mitotic chromosomes involves a staining procedure using Giemsa stain. One variation of this technique allows a low-resolution of chromosome bands while a second variation allows a high resolution. At low resolution we can see about ________ bands while at high resolution we see about ________ bands.
A) 300; 2000 B) 300; 1000 C) 100; 2000 D) 100; 1000
Sex chromosomes do all of the following EXCEPT ____
a. determine gender b. vary from one sex to another c. carry some genes that have nothing to do with sex d. appear in a diploid cell as either XX or XY e. appear in a haploid cell as either XX or XY
Which physician is first associated with vaccination?
A) Ehrlich B) Jenner C) Lister D) Koch E) Escherich