Oxygen and carbon dioxide diffuse in and out of a leaf through the

a) palisade mesophyll.
b) guard cells.
c) xylem.
d) stomata.


Ans: d) stomata.

Biology & Microbiology

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An infection acquired by a hospitalized patient that was not present when he or she entered the hospital is referred to as a(n) _____ infection

a. autonomous b. nosocomial c. opportunistic d. septic

Biology & Microbiology

When an action potential reaches a neuron terminal, it causes uptake of _______ ions, which are most directly responsible for exocytosis of neurotransmitter.

A. potassium B. sodium C. calcium D. chloride

Biology & Microbiology

Axons and dendrites of individual neurons, arranged in bundles and covered by connective tissue, make up ________

Fill in the blank(s) with correct word

Biology & Microbiology

Which of the following makes its own food using energy and simple raw materials it obtains from nonbiological sources?

A. Producer B. Nutrient C. Consumer D. Cell E. Protist

Biology & Microbiology