The secondary structure of a protein refers to the .a. three-dimensional folded structure of the protein. b. configuration of the folded protein when bound to other proteins. c. linear assembly of amino acids into a chain. d. twisting of the amino acid chain into a corkscrew-like shape or into a zigzag folding pattern. e. None of the above answer choices is correct.

(A.) three dimensional folded structure of the protein

Explanation:

The secondary structure of a protein is a regular structure built from interactions between neighboring amino acids as the polypeptide starts to fold or coil into its functional three-dimensional shape.

The two kinds of secondary structures arising from this polypeptide 'flexing' are either the  α-helix and β-pleated structures, all of which are vital to globular and fibrous proteins.

1. the question asks the most appropriate, which seems to rule out "all of the above." your choice appears to be the correct one.

2. the protocol described is good for identifying correlation, but not cause and effect. for cause/effect, you need to devise a protocol that will assign the treatment (or not) to groups that have essentially the same "demographics" with respect to all the other variables. your choice regarding control group seems appropriate. random assignment of treatment (choice d) may be appropriate also. (i think you can argue that b and d are just different descriptions of the same method.)

3. d will randomize the birds, but may not guarantee there are 10 in each group. e will do both, so seems the better choice.

comment on question 2

based on the problem statement, it seems clear that confident, attentive drivers are more likely to use daytime running lights. so, the protocol might need to be devised in such a way that the lights would be turned on or off without the driver's knowledge. (an attentive driver will figure it out.) assigning a confident, attentive driver to a group required to drive without running lights might mess with his/her confidence and attentiveness. you don't want your experiment to do that. (nor do you want the experiment to subject a driver to greater risk of accident as a consequence of driving without running lights.) experiments involving human safety are always problematic.

2b2t

explanation:

2b2t