Is the following statement TRUE or FALSE? Explain why you think so. "Proteins are the only biomolecules capable of catalyzing bond formation."
What will be an ideal response?
Answer: A theme to this answer should be how several different RNA molecules catalyze the formation of bonds in the process of protein synthesis (translation) and/or mRNA processing. Specifically, the peptidyl transferase reaction is catalyzed by 23S rRNA, rather than by ribosomal proteins. Catalytic RNAs are also involved in splicing the introns of mRNA in Archaea and Eukarya.
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Most cancers require at least two mutations: 1) one in an oncogene, which encodes proteins that trigger cell division,
and 2) one in a tumor suppressor gene, whose protein products, in their unmutated form, play a key role in preventing the cell cycle from progressing if the DNA is damaged or in the absence of specific cues. Which class of proteins might be considered tumor suppressors?
a. Cdk inhibitors b. cyclins c. growth factor receptors d. microtubules e. transcription factors
As temperature decreases, the metabolic rate of an endotherm typically ____ and the metabolic rate of an ectotherm
typically ____.
a. decreases; decreases b. increases; decreases c. decreases; increases d. increases; increases e. increases; remains the same
Please refer to the table for question 107-110 in the 1999 test Which of the following can be correctly concluded about the relationship between intestinal length and body size for the organisms in the table?
A. Carnivores have greater intestinal length relative to body size than do herbivores B. Herbivores have greater intestinal length relative to body size than do carnivores C. Omnivores have greater intestinal length relative to body size, the more nutrients are absorbed. D. THe smaller the intestinal length relative to body size, the more nutrients are absorbed E. No relationship exists between intestinal length and mode of nutrition
Triglycerides are so named because they are formed by a reaction among three fatty acid molecules and one ______
amino acid glucose glycerol lipid