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
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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.
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
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
An infectious protein is a
virus. viroid. prion. virion. prophage.