Explain how a single gene can result in more than one RNA product due to different ways of processing the pre-mRNA
What will be an ideal response?
Ans: Alternative splicing, in which the intron removal and exon splicing process may vary, can result in two or more different RNA products from the same gene. For example, splicing junctions may be either recognized or skipped to either include or exclude specific exons in the final transcript, or splicing junctions may be skipped to extend the length of an exon to an alternate splice site.
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a. melanocytes c. neuroglial cells b. keratinocytes d. neurons
When comparing viruses and bacteria, which one of the following statements is CORRECT?
A) Viruses are larger than bacteria. B) Viruses are pathogens; bacteria are decomposers. C) Viruses have membrane-bound organelles; bacteria do not have membrane-bound organelles. D) Viruses and bacteria are both able to reproduce on their own. E) Viruses and bacteria both contain genetic material.
Why do transmembrane proteins have domains?
a. because they have to interact with both foreign DNA and the hydrophobic core b. because they have to recognize cancer cells c. because the cell needs them in order to reproduce d. because they have to interact with both the aqueous environment and the hydrophobic core
After following populations of E. coli for 1150 generations, Sandra Trindale and her colleagues noted that most mutations are _______
Fill in the blank with the appropriate word.