Today, the fossil record
A. can be dated only with one layer in relation to older layers below and younger layers above, no actual dates can be estimated.
B. can be dated reasonably well only with uranium-238.
C. can be dated reasonably well using a variety of radioactive isotopes with known half-lives.
D. can be dated precisely, to within a single year, using radioactive isotopes.
E. can be dated precisely, to within a single year, using DNA hybridization.
C. can be dated reasonably well using a variety of radioactive isotopes with known half-lives.
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Which of the following correctly lists the components necessary for prokaryotic and eukaryotic transcription?
A. RNA polymerase, general transcription factors, DNA, and RNA nucleotides B. RNA polymerase, general transcription factors, DNA and DNA nucleotides C. ribosomes, general transcription factors, DNA and DNA nucleotides D. ribosomes, general transcription factors, DNA and RNA nucleotides
Explain why vigorous exercise in warm weather could be hazardous to your enzymes
What will be an ideal response?
The liver functions to do all of the following EXCEPT
a. produce bile. b. remove toxins ingested in food. c. inactivate hormones. d. process nutrients into required substances. e. produce glucagon.
The GAL gene system in yeast is used to metabolize galactose. In the presence of galactose, the GAL genes are expressed; however, in the absence of galactose, the GAL genes are repressed. A yeast mutant is discovered that continuously expresses the GAL
genes in the presence or absence of galactose. Which GAL gene is likely mutated? A) GAL3 B) GAL4 C) GAL1 D) GAL 10 E) GAL180