The spontaneous loss of amino groups from adenine in DNA results in hypoxanthine
ID: 99984 • Letter: T
Question
The spontaneous loss of amino groups from adenine in DNA results in hypoxanthine, an uncommon base, opposite thymine. What combination of proteins could repair such damage? A) topoisomerase, helicase, single-strand binding protein B) nuclease, DNA polymerase, DNA ligase C) topoisomerase, primase, DNA polymerase D) DNA ligase, replication fork proteins, adenylyl cyclase The nitrogenous base adenine is found in all members of which of the following groups of molecules? A) glucose, ATP, and DNA B) proteins, ATP, and DNA C. ATP, RNA, and DNA D) proteins, triglycerides, and testosterone E) proteins, carbohydrates, and ATP Which of the following best describes the significance of the TATA box in eukaryotic promoters? A) It is the recognition site for a specific transcription factor. B) It sets the reading frame of the mRNA. C) It signals the end of the nucleotide sequence of the gene. D) It is the recognition site for ribosomal binding. RNA polymerase in which direction along the DNA? A) 3' to 5' along the template strand B) 5 to 3' along the double-stranded DNA C) 5' to 3' along the template strand D) 3' to 5' along the nontemplate strand E) 5' to 3' along whichever strand it's on Use the following model of a eukaryotic transcript to answer the question E_1-4 refer to the and I_1-3 refer to the introns in the pre-mRNA transcript. 5'UTR E_1 I_1 E_2 I_2 E_3 I_3 E_4 UTR 3' Which components of the previous molecule will also be found in mRNA in the cytosol A) 5' UTR E_1 E_2 E_3 E_4 UTR 3' B) 5' E_1 I_1 E_2 I_2 E_3 I_3 E_4 3' C) 5' I_1 I_2 I_3 3' D) 5' UTR I_1 I_2 I_3 UTR 3' E) 5' E_1 E_2 E_3 E_4 3' Use the following model of a eukaryotic transcript to answer the question. E_1-4 refer to the exons and I_1-3 refer to the introns in the pre-mRNA transcript. 5' UTR E_l I_1 E_2 I_2 E_3 I_3 E_4 UTR 3' Where on a pre-mRNA transcript does a spliceosome bind? A) to the exons B) to each end of an intron C) to the 5' UTR D) to the 3' UTRExplanation / Answer
Answer
36). B. Nuclease, DNA polymerase, DNA ligase
Explanation:
Nucleases are enzymes that degrade DNA molecules by breaking the phosphodiester bonds that link one nucleotide to the next in a DNA strand.
DNA polymerases are enzymes that catalyse the synthesis of a new DNA strand from a pre-existing strand.The enzyme adds deoxyribonucleotides to the free 3’-OH of the chainundergoing elongation.
Ligases are enzymes that join the nucleic acid molecules together. These nucleic acids can either be DNA or RNA, and the enzymes are thus called DNA ligase and RNA ligase, respectively.
37). C. ATP, RNA & DNA
Explanation:
Adenine is a nitrogen base present in DNA & RNA. ATP consists of adenine, phosphate & ribose sugar
38). A) It is the recognition site for a specific transcription factor.
Explanation:
A TATA box is a DNA sequence that indicates where a genetic sequence can be read and decoded. It is a type of promoter sequence, which specifies to other molecules where transcription begins. Transcription is a process that produces an RNA molecule from a DNA sequence.
39). A) 3' to 5' along the template strand
Explanation:
In DNA replication, transcription proceeds in the 5' 3' direction. The DNA template strand is read 3' 5' by RNA polymerase and the new RNA strand is synthesized in the 5' 3' direction.
40). A. 5' UTR E1 E2 E3 E4 UTR 3'
41). B. to each end of an intron
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