Chargaff showed that DNA in several species contains equal amounts guanine and ________.

A) nitrogen

B) thymine

C) cytosine

D) adenine


C) cytosine

Biology & Microbiology

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The most prominent organelle visible in most eukaryotic cells is the

A. cell membrane. B. endoplasmic reticulum. C. nucleus. D. mitochondrion. E. chloroplast.

Biology & Microbiology

Molecular chaperones

A) help guide proteins from the nucleus to the cytoplasm. B) help guide proteins from the cytoplasm to the endoplasmic reticulum. C) help fold proteins properly. D) are proteins with structural function. E) are proteins with enzymatic function.

Biology & Microbiology

Nonsense suppressors are usually mutations in genes coding for

A) proteins. B) enzymes. C) mRNA. D) tRNA. E) rRNA.

Biology & Microbiology

If a pathogen penetrates nonspecific physical and chemical surface barriers, it breaks through the ________

A) first line of defense B) second line of defense C) third line of defense D) first and second lines of defense

Biology & Microbiology