The presence of ____ distinguishes eukaryotes from prokaryotes?
a. plasma membrane
b. ribosomes
c. nucleus and membrane bound organelles
d. genetic material
Ans: c. nucleus and membrane bound organelles
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Several new materials have been developed for use in the microbiology lab. These materials must be sterilized before use, but cannot withstand a temperature over 60oC and can't be exposed to water. Which method of sterilization would be applicable?
A. Oven-dry heat B. UV radiation C. Steam autoclave D. Ionizing radiation
Which of the following is an example of post-transcriptional control of gene expression?
A) the addition of methyl groups to cytosine bases of DNA B) the binding of transcription factors to a promoter C) the removal of introns and alternative splicing of exons D) gene amplification contributing to cancer E) the folding of DNA to form heterochromatin
Which of the following are compounds?
A) H2O, O2, and CH4 B) H2O and O2 C) O2 and CH4 D) H2O and CH4, but not O2
Which of the following pairs of molecules could be joined together by a peptide bond in a dehydration reaction?
A) 2 and 3 B) 7 and 8 C) 8 and 9 D) 12 and 13