_____ are responsible for blood clotting.
a) Sarcomeres
b) Leukocytes
c) Erythrocytes
d) platelets
Ans: d) platelets
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Energy yields are high enough for Fe2+ oxidation that the bacteria that perform this reaction require only small quantities of Fe2+ to be available
Indicate whether the statement is true or false.
The feeding biology of sponges is referred to as:
a. grazing. b. filter feeding. c. carnivory. d. deposit feeding. e. omnivory
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 would be much more useful than mRNA that is only translated into one protein. 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 the 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.
Elucidation of the histone code might
A. allow us to turn specific genes on or off. B. lead to chromatin remodeling. C. allow us to control translation. D. allow the determination of nucleosome composition.