Which of the following is incorrect about the polymerase chain reaction?
A. It cannot be used on very old samples of tissue or blood.
B. It makes identical copies of the DNA molecule to be amplified.
C. It can be used to identify the owner of a single hair.
D. It uses a heat stable DNA polymerase.
E. It is an amplification process.
Answer: A
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A rock contains 18 mg of the radioactive isotope carbon-14. The half-life of carbon-14 is 5,600 years. How many half-lives and years will it take before the carbon-14 decays to less than 4 mg?
A. 1 half-lives; 5,600 years B. 2 half-lives; 11,200 years C. 3 half-lives; 16,800 years D. 4 half-lives; 22,400 years E. 9 half-lives; 50,400 years Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about half-lives of radioactive isotopes? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Cells that are produced during meiosis have _____ of chromosomes and are referred to as ____.
a. one set; diploid b. two sets; diploid c. one set; haploid d. two sets; haploid
Mutations in bacterial porins typically lead to antibiotic resistance by
A) changing the orientation of the porin ?-helical transmembrane segments to constrict the size of the channel. B) changing the stereoisomer specificity of the porin transport. C) blocking diffusion of the antibiotic through the porin channel. D) disrupting the voltage difference across the porin channel. E) reversing water transport through the channel.
Which cofactor is involved in the Calvin cycle reactions?
What will be an ideal response?