Why does the transcriptome differ within an organism's cell types?
What will be an ideal response?
All the genes of a multicellular organism are not expressed in every cell type. The various cell types express different subsets of the genome, and the makeup of the transcripts (the transcriptome) differs depending on which genes are expressed at a given time.
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According to the phylogenetic tree showing evolutionary relationships among viruses in Figure 13.6, which one of the following is most closely related to the human lentivirus HIV2?
A. a horse lentivirus B. another human lentivirus C. a cow lentivirus D. a simian lentivirus E. a cat lentivirus
A fairly conserved gene is compared between a human, a chimpanzee, a bear and a banana. How
would you expect their DNA sequences to relate? What will be an ideal response?
Why is back pain so common in humans? What will be an ideal response?
Which of the following produces the cellulose-digesting enzyme (cellulase) in a cow's digestive tract?
A) Gallbladder B) Cells lining the small intestine C) Pancreas D) Liver E) Microorganisms in the rumen