Exotoxins:

A. Are made of protein
B. Are always enzymes
C. Are present in Gram-positive bacteria only
D. All of the above
E. None of the above


Ans: A. Are made of protein

Biology & Microbiology

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Cells in the G2 stage of the cell cycle have ________ as cells of the same species in the G1 stage.

A) twice as many crossovers B) twice as many chromatids C) half as many chromatids D) the same number of chromatids E) half as many chromosomes

Biology & Microbiology

A major change in evolutionary patterns over

long periods of time is best described as

a. macroevolution. b. microevolution. c. allopatric speciation. d. directional selection. e. sympatric speciation

Biology & Microbiology

What is the term used to indicate the growth of new blood vessels?

a. Biosynthesis b. Angiogenesis c. Metastasis d. Apoptosis

Biology & Microbiology

Where does the C4 cycle get its name?

A) It is a four-step process. B) The first product in the cycle has four carbons. C) PEP is a four-carbon molecule. D) Only four carbons are used in the cycle. E) Four CO2 molecules are released.

Biology & Microbiology