An ecosystem is unlikely to be limited by the supply of _____ because it is obtained from the air.

a. water
b. carbon
c. phosphorus
d. calcium
e. nitrogen


Answer: b. carbon

Biology & Microbiology

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Alpha helices are coils with how many amino acids per complete turn?

A. 2.5 B. 3.6 C. 4.8 D. 10 E. 20

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Four of the five answers listed below are hydrogen acceptors. Select the exception

a. oxygen b. cytochrome c. ATP d. NAD+ e. FAD

Biology & Microbiology

Select the true statements describing why cladistics may not always be the best method for reconstructing phylogenies based on data from the DNA genome.

A. The number of character states for DNA is large. B. The rate of evolution of the DNA genome is rapid. C. The assumptions of the principle of parsimony are not always met. D. Homoplasy often dominates the data sets.

Biology & Microbiology

What are the functions of N, Cro, and Q in phage lambda?

What will be an ideal response?

Biology & Microbiology