Choose the letter of the best match from the following:A. protodermB. vascular cambiumC. apical meristemD. procambiumE. ground meristemProduces parenchyma, collenchyma, and sclerenchyma cells.
Fill in the blank(s) with the appropriate word(s).
Answer: E
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Explain the reasoning behind the laws in some European countries that limit the number of children that can result from a single sperm donor. Do you agree with these restrictions? Why or why not?
What will be an ideal response?
Extracts of pathogenic bacteria can transform
harmless bacteria to harmful bacteria unless __________ enzymes are added to the extract. a. protein-digesting b. mRNA-digesting c. tRNA-digesting d. DNA-digesting e. any of these
Carcinogens can damage DNA by each of the following mechanisms except
A) by binding to DNA and directly disrupting base pairing. B) by generating cross-links between DNA strands. C) by hydroxylating DNA bases. D) by causing breaks in one or both strands. E) All the above are mechanisms by which carcinogens can damage DNA.
A northern blot differs from a Southern blot in the
A) type of probe used. B) presence or absence of a nitrocellulose membrane. C) size of the genetic sequences involved. D) number of genetic sequences detected. E) type of nucleic acid being isolated.