The main photosynthetic area of a leaf

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


A

Biology & Microbiology

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In the condition called athlete's foot, the fungus Trichophyton consumes the keratin protein found in hair, nails, and dead skin.  Which of the following descriptors does not apply to Trichophyton?

A. Saprobe B. Parasite C. Eukaryote D. Heterotroph

Biology & Microbiology

Which one of the following statements CORRECTLY compares the effects of a mutation in a gamete to the effects of a mutation in a somatic cell?

A) Somatic cell mutations always cause cancer, whereas gamete mutations do not. B) Gamete mutations are passed to the next generation, whereas somatic cell mutations are not. C) Gamete mutations are typically deadly, whereas somatic cell mutations are not. D) Somatic cell mutations are typically deadly, whereas gamete mutations are not. E) Mutations in both types of cells usually result in cancer.

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If a tetraploid species gave rise to a new species by autopolyploidy, how many sets of homologous chromosomes would the new species have in its somatic cells?

a. Eight b. Sixteen c. Three d. Two e. Four

Biology & Microbiology

Normal cell operations and growth occur during the "gap" period called:

A) G1. B) M. C) S. D) G3.

Biology & Microbiology