Since a small change in the amount of nitrogen in the soil greatly affects plant growth, it is known as a(n) 

A. biotic potential.
B. limiting factor.
C. intrinsic factor.
D. mortality factor.


B. limiting factor.

Biology & Microbiology

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The low success rate and age-related diseases associated with reproductive cloning is thought to be due to  

A.  genetic imprinting. B.  the age of the donor cell. C.  cell cycle problems. D.  large offspring syndrome (LOS).

Biology & Microbiology

Muscle cells are stimulated by acetylcholine released from the terminals of

A. transverse tubules. B. motor neuron axons. C. sensory cell axons. D. motor neuron dendrites. E. sensory cell dendrites.

Biology & Microbiology

Which scientist(s) discovered the basis for the

base-pair rule, which states that the amounts of adenine and thymine match, as do the amounts of cytosine and guanine? a. Avery b. Griffith c. Chargaff d. Hershey and Chase e. Pauling

Biology & Microbiology

Which of the following is a laboratory method in which embryonic plants are grown from individual meristem cells?

A. Tissue culture propagation B. Double fertilization C. Vegetative reproduction D. Asexual reproduction E. Alternative germination

Biology & Microbiology