If 14c-labeled uracil is added to the growth medium of cells, what macromolecules will be labeled?

If 14c-labeled uracil is added to the growth medium of cells, what macromolecules will be labeled? RNA

14C-labeled compounds

Specifications:

If 14c-labeled uracil is added to the growth medium of cells, the macromolecules will be labeled Ribonucleic acid (RNA).

Ribonucleic acid (RNA) is a polymeric molecule essential in various biological roles in coding, decoding, regulation and expression of genes. RNA (ribonucleic acid) is made up of four chemical bases: adenine (A), cytosine (C), guanine (G) and uracil (U) connected by a ribose backbone. RNA is a single-stranded molecule and it is not stable under alkaline conditions. RNA directly codes for amino acids and as acts as a messenger between DNA and ribosomes to make proteins.

When there are 14c-lable uracil that are added to the growth medium of cells, the macromolecules that will be labled are RNA. Uracil is a nucleobase that make up the DNA or the RNA. In RNA, uracil binds with other nucleobase (adenine) through hydrogen bonds.

Grade:  9

Subject:  chemistry

Chapter:  RNA

Keywords:  RNA

i don t now

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.