Which soil horizon has no organic matter, but has
some weathered rock?
a. A
b. B
c. C
d. D
e. E
Answer: d
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Which of the following is true of a nanometer?
A) A nanometer is about the size of a common bacterial cell. B) A nanometer is one millionth of a meter. C) A nanometer is equivalent to 10 Angstroms (Å). D) The nanometer is the most common measurement used in measuring whole cells. E) none of the above
Why is there no cure for prion-related diseases?
What will be an ideal response?
What is the modern definition of a gene?
a. A DNA sequence that encodes a specific RNA or protein product b. A DNA sequence that encodes a specific polypeptide c. An RNA sequence that encodes a single polypeptide d. A DNA sequence that encodes several proteins e. A DNA sequence that encodes specific amino acids
What factor most limits a person's maximal increase in cardiac output during exercise?
A. The time it takes for electrical impulses to reach all parts of the heart B. The time available to fill the heart chambers with blood as the heart rate increases C. The total amount of blood in an individual D. The rate at which cardiac muscle contracts E. The rate at which oxygen is delivered to the cardiac muscle cells