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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology