A Ramachandran plot shows the sterically limited rotational domains:
A. between proline and noncylic amino acids.
B. between polar and nonpolar R groups.
C. of an R group with respect to the neighboring R groups.
D. of an R group with respect to the polypeptide backbone.
E. that two polypeptide chains can occupy.
D
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Match each mechanism of horizontal gene transfer with its definition:
A. Transduction i. DNA transfer between two linked bacterial cells B. Transformation ii. bacteria picks up environmental DNA C. Conjugation iii. gene transfer via a bacteriophage
Which are essentially equivalent treatments?
A. Dry 200?C heat for 1.5 hours; wet 121?C heat for 15 minutes B. Dry 160?C heat for 1.0 hour; wet 200?C heat for 30 minutes C. Dry 121?C heat for 1.5 hours; wet 200?C heat for 15 minutes D. Dry 100?C heat for 2.0 hours; wet 100?C heat for 30 minutes
Four of the five answers listed below are
anthropoids. Select the EXCEPTION.
a. gorilla b. human c. tarsier d. lemur e. monkey
When all living organisms are included, which biomes contain about 70% of the biomass found on Earth's land surface?
A) forests B) grasslands C) tundras D) deserts