Immediate source of energy for organisms:
a. carbohydrates
b. proteins
c. fat
Ans: a. carbohydrates
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Imagine that you and your colleagues are working in a lab to develop a protein synthesis system for a new type of synthetic cell. During your brainstorming sessions, you propose that polycistronic mRNA (an mRNA with multiple start and stop codons)
would be much more useful than mRNA that is only translated into one protein (with just one start and stop codon). This would allow for multiple proteins necessary for a particular function to be translated together. One of your colleagues says that is a good idea, but if you decide to go with polycistronic mRNA, you'd better make sure to use a prokaryotic translation system. Why might it be problematic to use a eukaryotic translation system with polycistronic mRNA? A. Introns would always prevent translation of the mRNA. B. Eukaryotic ribosomes initiate translation by binding to the 5-cap, which is only at one end of the mRNA. C. Prokaryotic ribosomes do not detach from mRNA when they reach a stop codon. D. Eukaryotic start and stop codons are different from prokaryotic start and stop codons.
In 2006, scientists discovered a fossil that had scales and gills, a flat head with eyes on top like a crocodile, and fin and neck bones that would allow it to prop itself out of the water. The best explanation for this fossil is that it is
A. a transitional fossil between fish and amphibians. B. a transitional fossil between amphibians and reptiles. C. a ray-finned fish. D. a modern amphibian.
A mutation in the gene encoding the integrase enzyme renders the protein non-functional. How would this affect-the HIV infection cycle?
A. The gp120 glycoprotein would not be able to bind the CCR5 receptor. B. Reverse transcription would not be possible. C. The viral DNA would not be able to integrate the viral genome into a chromosome. D. Cutting and assembling the capsid would be halted. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about the HIV infection cycle? 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?
Which vitamin could build up to dangerous levels within the body?
A) vitamin B12 B) vitamin C C) vitamin D D) folic acid