What do the "puffs" of polytene chromosomes represent?
What will be an ideal response?
Ans: A puff is a region of the polytene chromosome where the chromosome fibers have become unraveled from their tight packing. This is correlated with gene expression in that region. The structure is relaxed in this region to allow access of proteins necessary for transcription.
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Why is it that primers are needed for DNA replication? They help with the joining of Okazaki fragments
A. A tiny amount of RNA is needed to tell the cell where genes are located. B. DNA polymerase can only add nucleotides to an existing chain, it cannot initiate synthesis of a new strand. C. The primers help with the proofreading function of DNA polymerase. D. They help direct the placement of the telomeres.
Complementary DNA (cDNA) probes are produced using
A. RNA polymerase. B. DNA ligase. C. restriction endonucleases. D. reverse transcriptase.
A birdhouse is nailed into a tree 6 feet up from the ground. If the tree grows about 2 feet taller each year, where will the birdhouse be 25 years later?
A. 50 feet B. 56 feet C. 26 feet D. 6 feet E. 4 feet Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about a tree grows? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach 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?
Stimulation of T lymphocytes, leading to their synthesis of a growth factor resulting in T lymphocyte proliferation, is an example of _______ signaling.
a. autocrine b. endocrine c. paracrine d. direct cell-to-cell