How many different types of amino acids are found in proteins?

A) 4 B) 1,000 C) 200 D) 100 E) 20


Answer: E

Biology & Microbiology

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Which genus of gastropod has been reported to have caused human fatalities?

a. Cyphoma b. Cassis c. Conus d. Busycon e. Nassarius

Biology & Microbiology

Blood agar is both a differential and enriched medium.

Answer the following statement true (T) or false (F)

Biology & Microbiology

Alexander Oparin hypothesized that living cells evolved from coacervates; what was the "boundary" material of the coacervates Oparin made, and how does this boundry differ from present day liposome membranes?

A. Oparin used a phospholipid bilayer to build the coacervates, it is the same as the bilayer found in present day lysosomes. B. Oparin's coacervates were surrounded by a tight skin of water molecules, the same as present day lysosomes. C. Oparin's coacervates were surrounded by carbohydrates and lipids, unlike present day lysosomes which have a carbohydrate membrane only. D. Oparin's coacervates were surrounded by a tight skin of water molecules; present day lysosomes have a phospholipid bilayer for their membrane. E. Starch was the main component in Oparin's coacervate boundry; lysosomes also use mainly carbohydrates for their membrane.

Biology & Microbiology

Simple sequence repeat loci are highly variable because of what process?

A) repair of double strand breaks that result from exposure to X-rays B) exposure to DNA damaging chemicals found in food and water C) the formation of thymine dimers by ultraviolet light D) slipped mispairing during DNA replication

Biology & Microbiology