The main photosynthetic area of a leaf is

a. mesophyll.
b. cortex.
c. phloem.
d. epidermis.
e. all of these


A

Biology & Microbiology

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Ribozymes are non-protein molecules with catalytic activity

Indicate whether this statement is true or false.

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Refer to the accompanying figure. The root of the tooth is made up of the parts labeled:a

4 and 5 only b. 3, 4, and 5 only c. 1, 2, and 3 only d. 1, 2, 3, and 4 only e. 1, 2, 3, 4, 5

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In the lac operon, in the absence of the inducer

a. the repressor gene is not transcribed. b. the genes encoding enzymes are not translated. c. the repressor gene is not translated. d. the repressor cannot bind to the operator. e. the genes encoding enzymes are not transcribed.

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In Figure 8.1, which colonies are streptomycin-resistant and leucine-requiring?

A) 1, 2, 3, and 9 B) 3 and 9 C) 4, 6, and 8 D) 4 and 8 E) 5 and 6

Biology & Microbiology