Which explanation best describes the asymmetrically oriented structure of the proteins in the cell membrane?
a. Each type of protein has its own function.
b. These proteins are manufactured by free ribosomes.
c. These proteins are initially formed by ribosomes on the rough ER.
d. These proteins pass through the ER membrane into the ER lumen.
e. Enzymes are needed to modify the carbohydrate chains on these proteins.
a
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Since energy cannot be created, which arrow represents the energy that will be converted to chemical energy the chameleon can later use?
A. Arrow A, the tongue extending B. Arrow B, the insect being eaten C. Arrow C, sunlight striking the chameleon D. Arrow D, heat radiating from the chameleon
In the respiratory tract, ciliated cells constantly sweep mucus that contains trapped foreign matter
a. True b. False
Which situation(s) might warrant the removal of a histidine tag when purifying a recombinant protein?
A. The expression vector used for inserting the gene of interest already contains histidine-encoding sequences. B. Histidine residues inhibit protein folding, thereby decreasing the functionality of the protein. C. Histidine residues bind preferentially to nickel resins on the column during purification, and are not washed away. D. All of the choices are correct.
Bacterial sexual processes are not so regular. However, they serve the same aim: to mix the genes from two different organisms together. All of the following are sexual processes EXCEPT:
A. Mutation B. Transformation C. Conjugation D. Transduction