Scientists have used the fossil record to estimate the average length of time that a species inhabits the Earth. How can this estimate be useful for assessing the impact of humans on the Earth's biological diversity?
A) It can help determine how long the human species might survive.
B) It can determine which species might become extinct soon, even if humans aren't involved.
C) It can estimate how many species extinctions are caused by human activity.
D) It can assure us that human activity is not the cause of most species extinctions.
C
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Because of some of the problems with explaining how the first RNA organisms originated, an alternative possibility
has been proposed in which ____.
a. proteins and RNA evolved simultaneously b. DNA existed before RNA c. lipids functioned as enzymes d. a different form of life existed before the RNA world e. viruses functioned as carriers for RNA
Chitinases are examples of
a. systemins. b. phytoalexins. c. PR proteins. d. R genes. e. heat-shock proteins.
Which of the following is NOT true of
kwashiorkor?
a. it is the result of a diet poor in fatty acids b. symptoms include brittle hair c. symptoms include muscle loss and fatigue d. symptoms include an enlarged liver e. all of these are true of kwashiorkor.
The scientist who first determined the complete amino acid sequence of a protein (insulin) was
a. Christian Anfinsen. b. John Kendrew. c. Linus Pauling. d. Frederick Sanger.