Bio and Biochem AAMC FL #2 with complete solutions 2023

Bio and Biochem AAMC FL #2 with complete solutions 2023The information in the passage suggests that in mice CRY1 most likely affects XPA by: A. activating XPA protein activity. B. activating translation of XPA-encoding transcripts. C. repressing replication of the XPA-encoding gene. D. repressing transcription of the XPA-encoding gene. Solution: The correct answer is D. This is a biology question that falls under the content category “Transmission of genetic information from the gene to the protein.” The answer to this question is D because Figure 1 shows that XPA levels decrease as CRY1 levels increase. It is a Scientific Reasoning and Problem-Solving question because the question involves determining which cellular process would lead to a reduction in XPA levels. Which cells harvested from adult mice were most likely used as the highly proliferative benchmark in the experiment that generated the data shown in Figure 3? A. Adipocytes B. Cardiac muscle cells C. Gastrointestinal epithelial cells D. Neurons Solution: The correct answer is C. This is a Biology question that falls under the content category “Structure and integrative functions of the main organ system.” The answer to this question is C because the epithelial cells that line the gastrointestinal tract are typically highly proliferative. After a section of a DNA strand containing a UVR-induced lesion is removed and resynthesized, the newly synthesized strand is rejoined to the remainder of the DNA strand by what type of bond? A. Disulfide B. Hydrogen C. Peptide D. Phosphodiester Solution: The correct answer is D. This is a Biochemistry question that falls under the content category “Transmission of genetic information from the gene to the protein.” The answer to this question is D because phosphodiester bonds link the 3ʹ carbon atom of one deoxyribose and the 5ʹ carbon atom of another deoxyribose within the DNA molecules. Which image shows an example of a cyclobutane pyrimidine dimer? (Image on back of card) Solution: The correct answer is C. This is a Biochemistry question that falls under the content category “Transmission of genetic information from the gene to the protein.” The answer to this question is C because it is the only image that displays a dimer of two pyrimidine residues. AlP exposed to an aqueous solution in which pH range will result in the largest amount of phosphine production? A. pH < 4 B. 4 < pH < 7 C. 7 < pH < 10