The main photosynthetic area of a leaf is composed

of
a. mesophyll.
b. cortex.
c. xylem.
d. epidermis.
e. none of these.


Answer: a

Biology & Microbiology

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What is the name of the specific region where replication of a bacterial chromosome begins?

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Two students studying physiology taste a known "bitter" substance, and both report sensing bitterness. They then sample another substance. Student A reports sensing both a bitter taste and a salty taste, but student B reports only a salty taste

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Bits of DNA that literally jump from one chromosome to another are

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