Which agents exert antimicrobial activity via oligodynamic action?
a) Aldehydes
b) Heavy metals
c) Peroxygens
d) Nitrates
Ans: b) Heavy metals
Biology & Microbiology
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How many molecules of NADPH are needed to reduce one molecule of carbon dioxide to carbohydrate by oxygenic phototrophs during the dark reactions of photosynthesis?
A. 3 B. 4 C. 10-12 D. 2
Biology & Microbiology
How do Ctenophora differ from Cnidaria?
a. They have a true coelom. b. They are non-motile. c. They have rotation symmetry. d. They have bi-radial symmetry.
Biology & Microbiology
What is the waxy, waterproof band between the plasma membranes of root endodermal cells?
a. cuticle b. plasmodesmata c. root cell wall d. lignin wall e. the Casparian strip
Biology & Microbiology
The main target of the HIV virus is
A. red blood cells. B. B cells. C. cytotoxic T cells. D. memory T cells. E. CD4+ cells (macrophages and helper T cells).
Biology & Microbiology