The Murchison meteorite was a significant discovery for the study of the origin of life, because it ________
A) contained self-replicating organisms
B) contained carbon, hydrogen, nitrogen, and oxygen
C) contained significant amounts of amino acids
D) contained short lengths of RNA
E) descended through the atmosphere slowly enough that friction was negligible
C
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The oldest fossil remains of Homo sapiens found so far date from about _____
A) 6 million years ago B) 1.6 million years ago C) 195,000 years ago D) 60,000 years ago E) 16,000 years ago
Titer is the amount of ________ in serum.
A. antigen B. WBC C. memory cells D. complement E. antibody
Which group of gymnosperms diverged first?
A. ginkos B. conifers C. gnetophytes D. cycads E. angiosperms
The 2000–2004 drought in California:
a. shortened the growing season of the mustard plant. b. led to earlier flowering in the mustard plant. c. created selective forces that changed the characteristics of the mustard plant. d. All of the above. e. A and C.