One method used to prevent disulfide bond interference with protein sequencing procedures is:
A) cleaving proteins with proteases that specifically recognize disulfide bonds.
B) protecting the disulfide bridge against spontaneous reduction to cysteinyl sulfhydryl groups.
C) reducing disulfide bridges and preventing their re-formation by further modifying the —SH groups.
D) removing cystines from protein sequences by proteolytic cleavage.
E) sequencing proteins that do not contain cysteinyl residues.
Ans: C) reducing disulfide bridges and preventing their re-formation by further modifying the —SH groups.
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You discover a narrow subterranean river in the outback of Australia and estimate that it is at least 50 million years old, traveling through caves undisturbed by humans. You gather a crew of scientists to perform species sampling of the river as well as metagenomics techniques to calculate microbial diversity. The results indicate that although short in length, the river is extremely diverse. You even get to name a new species of shrimp after yourself! During one of your many interviews, you are asked to explain the high diversity of the subterranean river. What hypothesis would you cite?
A. The time hypothesis. B. The area hypothesis. C. The productivity hypothesis. D. The intermediate disturbance hypothesis.
An increase in the rate of oxygen production by algae would be accompanied by a comparable increase in the rate of production of which of the following substances?
a. C6H12O6 b. CO2 c. CH4 d. NH3 e. H2O
The two critical elements required to sign the bias of an omitted variable include the sign of the:
A. effect of the omitted variable on the outcome and the sign of the correlation between the omitted variable and the treatment. B. correlation between the omitted variable and the outcome and the sign of the correlation between the treatment variable and the outcome. C. effect of the omitted variable on the outcome and the sign of the correlation between the omitted variable and the outcome. D. effect of the omitted variable on the outcome and the sign of the effect of the treatment variable on the outcome.
Cancer is the number one cause of death in the US.
a. true b. false