Worksheet:
1. Draw the structure of Leucine? Explain why Leucine is considered as a hydrophobic amino acid?
2. Draw the structure of Lysine? Explain why Lysine is considered as a basic amino acid?

Here's what I get

Explanation:

Most of the common amino acids have the general formula RCH(NH₂)COOH.

We call the R groups the side-chains.

They account for the properties of the different amino acids, and we classify the amino acids according to the nature of the side chains.

1. Leucine

Leucine contains a four-carbon sidechain — an isobutyl group.

Alkyl groups are nonpolar and hydrophobic, so leucine is a hydrophobic amino acid.

2. Lysine

Lysine contains four carbon atoms and an NH₂ group.

Amino groups are basic, so lysine is a basic amino acid.

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.