Openings in plant leaves called allow for the exchange of carbon dioxide and oxygen.

A. cuticle
B. phloem
C. stomata
D. root
E. xylem


C. stomata

Biology & Microbiology

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The ________ activity of RNA polymerase is sufficient for the process of RNA proofreading.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Evidence that differentiating cells all contain complete genomes of an organism is provided by

a. comparison of frog and sea urchin development. b. Some cells remain totipontent c. totipotent cells give rise to multipotent cells d. multipotent cells can give rise to pluripotent cells e. the successful cloning of a sheep - Dolly

Biology & Microbiology

The probability of parents with the genotypes (Ll) (ll) having an offspring with the genotype (ll) is 

A. 1/2. B. 1/4. C. 3/8. D. 0.

Biology & Microbiology

________ is the study of the evolutionary relationships among a group of organisms.

A. Systematics B. Clastistics C. Statistics D. Logistics

Biology & Microbiology