Question

Description Instructions Timed Test This test has a time limit of 40 minutes. This test will save and submit automatically when the time expires Warnings appear when all the time. 5 minutes 1 minute and 30 seconds remain Mule Atems Note This can only be taken once Force Completion Once this best must be completed in one sitting Do not leave the best before doing Save and Submit This test does not allow backtracking Changes to the newer her submission are prohibited. Remaining Time: 35 minutes, 52 seconds. Question Completion Status: Moving to the next question prevents changes to Question of Question 1 1 points Save Answer Radioactively labeled 3 phosphoglycorate was created using 140. When is molecule is added to a col which of the following would not become radioactively labeled? a Amino acids Polysacchard d. Nucleic acids Lipids Moving to the next to prevents changes to this Question of 20 O here to search BÌ e à 11:37 AM à 0

Answer 1

When 3-phosphoglycerate is 14C radioactively labeled and incorporated into a cell it will make amino acids, polysaccharides, nucleic acids, and lipids will be radioactively labeled.

3-phosphoglycerate is involved in glycolysis and the reverse process of glucose production through gluconeogenesis, hence radioactive 3-phosphoglycerate will lead to radioactive labeling of polysaccharides.

3-phosphoglycerate is one of the precursor of amino acids family, serine family, hence will radioactively label the amino acids in the serine family (serine, glycine, and cysteine).

3-phosphoglycerate is also involved in the the glycerophospholid synthesis begining with the phosphatidate formation. Thus, the cell will also contain radioactively labeled lipid.

Phosphoribosyl pyrophosphate (PRPP) is one of the precursor of de novo synthesis of DNA. PRPP is synthesised from glycine amino acid, ATP, and ribose-5-phosphate. Glycine is a serine family amino acid which has 3-phosphoglycerate as the precursor, hence nucleic acids will also be radioactively labeled.

Since 14C is labeled in the 3-phosphoglycerate, there is no C in water molecule hence water will not be radioactively labeled. So the correct answer is water.