Four of the five statements below apply to the phosphorus cycle. Which one does not apply?

a. Phosphorus cycles from land to water and back again.
b. Phosphorus does not exist in a gaseous state.
c. Dissolved phosphorus enters aquatic ecosystems from the atmosphere.
d. Phosphorus will probably be depleted during the 21st century.
e. Erosion from clear-cutting and agriculture accelerate phosphorus loss.


c

Biology & Microbiology

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Which of the following is a test cross? (a “dash” means the allele's identity is unknown)

a. R-MM ? R-mm b. RRMM ? rrmm c. R-M- ? R-Md. rrMM ? RRmm e. R-M- ? rrmm

Biology & Microbiology

____ convert nitrogen gas to nitrogen that plants can use. 

A. Decomposers B. Nitrogen-fixing bacteria C. Nitrifying bacteria D. Denitrifying bacteria

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The term N-terminus refers to the presence of a(n) ________ at one of the ends of a polypeptide.

A. carbonyl group B. carboxyl group C. sulfate group D. oxygen atom E. amino group

Biology & Microbiology