If you were to take a cross section of a tree from the tropics, would you be able to determine the
accurate age of the tree? Why or why not? What will be an ideal response?
Concepts to Consider: No. Annual rings can be seen as differences in cell size between secondary
xylem formed during the summer of the previous year (when water is less plentiful) and the following
spring (when water is abundant). Tropical climates often have year-round precipitation patterns, which
may alter the number of rings shown in the trees, so an accurate determination of age is unlikely.
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A plasmid cloning vector and DNA fragments containing the XYZ gene, each digested with the same restriction
enzyme, are mixed with DNA ligase. Which product(s) will result?
a. recombinant plasmids only b. nonrecombinant plasmids only c. joined-together copies of the DNA fragment containing the XYZ gene only d. a mixture of recombinant plasmids, nonrecombinant plasmids, and joined-together copies of the DNA fragment containing the XYZ gene e. no reaction will occur because DNA polymerase rather than DNA ligase is needed to insert the DNA fragments into the plasmid cloning vector
Which of the following hormones is NOT
related to sexual reproduction?
a. GnRH b. ACTH c. LH d. FSH e. all of these are hormones related to sexual reproduction
Name the substance that serves as the hereditary material in eukaryotes and prokaryotes
What will be an ideal response?
Bacteria in the colon protect people from some infections.?
Indicate whether the statement is true or false.