Which of the following properties of guard cells allow them to open and close a pore? Select all correct choices

A. radially organized microfibrils
B. tangentially organized microfibrils
C. two guard cells being anchored together at
their ends
D. the ability of guard cells to change their ion
concentration
E. the lack of cytoplasm in guard cells


A,C,D

Biology & Microbiology

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After screening a colony of bacteria for mutations in a given gene, you discover 100 mutant colonies out of 3 million total colonies. What is the mutation frequency for this gene in the population?

A. 1.0 x 105 B. 1.0 x 10-5 C. 3.0 x 105 D. 3.3 x 10-5

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In angiosperms, after fertilization, the triploid cell gives rise to:

a. a fertilized ovule b. a seed c. an embryo sporophyte d. endosperm e. a pollen grain

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In performing a Gram's staining techniques, the decolorization reagent is

A. A mixture of acetone and alcohol B. A mixture of different alcohols C. A mixture of acid and alcohol D. A mixture of acetone and ether E. none of the above

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Which of the following is the layer of the meninges that has direct contact with the brain?

A) arachnoid mater B) geezin mater C) pia mater D) dura mater E) dinan mater

Biology & Microbiology