A layer of lipoprotein and glycoprotein that covers the outer surface of some viruses is the

A. casing.
B. membrane.
C. viroid.
D. capsid.
E. envelope.


Answer: E

Biology & Microbiology

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Answer the following statements true (T) or false (F)

1. Nitrogen is one of the most abundantly applied fertilizers worldwide. 2. Aluminum is not an essential mineral for plants and therefore may cause toxicity. 3. When a mycorrhizal fungus associates with the roots of a plant, the fungus usually causes harm to the plant. 4. Inexpensive sources of phosphorus fertilizers are nearly exhausted.

Biology & Microbiology

Which of the following gives the correct rank order for relative amount of water (most to least) required for excretion of the primary nitrogenous wastes used by different animals?

A. ammonia ? urea ? uric acid B. uric acid ? ammonia ? urea C. urea ? uric acid ? ammonia D. ammonia ? uric acid ? urea E. urea ? ammonia ? uric acid

Biology & Microbiology

What does myoglobin supply for muscle

activity?

a. oxygen for aerobic respiration b. phosphate for ATP formation c. direct energy for white muscle fiber contraction d. glucose for lactate fermentation e. more than one of these

Biology & Microbiology

An infectious protein is a

virus. viroid. prion. virion. prophage.

Biology & Microbiology