The purpose of closing stomata in plants is to prevent ____
a. carbon dioxide from escaping
b. water from escaping
c. oxygen from re-entering
d. gas exchange
e. photosynthesis
ANSWER: b
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What are antigens?
A. non-self proteins or cells B. proteins on the surface of B-cell membranes C. proteins that consist of two light and two heavy chain polypeptide chains D. proteins on the surface of macrophage membranes E. proteins on the surface of T-cell membranes
The pelvis is composed of which bones?
A. Sacrum B. Pelvic girdle C. Coccyx D. Floating ribs E. Lumbar verte
Plants get the nitrogen they need to build additional cells from
A. protein in the cells. B. ammonia or nitrate in the soil. C. denitrifying bacteria. D. directly from the nitrogen in air.
An undiluted disinfectant is always more effective than a diluted disinfectant.
A) True B) False