As the strands are synthesized in replication, which of the following is true?
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- QUESTION 25 During lagging strand synthesis of DNA, the RNA primers are replaced with DNA by __________. DNA Polymerase I DNA Polymerase II DNA Polymerase III PrimaseQUESTION 26 In a double-stranded DNA molecule, how are the sequences of each strand related to each other? A The sequences are identical. B The sequences are identical except that one strand has a U where the other strand has a T. C The sequences are the reverse compliment of each other and use the nucleotides, A, G, U, and C only. D The sequences are the reverse complement of each other.QUESTION NO. 1 Patients with the rare genetic disease xeroderma pigmentosum (XP) are very sensitive to light and are highly susceptible to skin cancers. The study of such patients has enhanced our knowledge of DNA repair because XP is caused by defective DNA repair nucleotide excision repair. (A variant, XP-V, is deficient in postreplication repair.) In nucleotide excision repair A. removal of the damaged bases occurs on only one strand of the DNA. B. only thymine dimers generated by UV light can be removed . C. the excision nuclease is an exonuclease. D. a single multifunctional enzyme carries out the repair process. E. only the damaged nucleotides are removed. QUESTION NO.2 Homologous recombination: A. occurs only between two segments from the same DNA molecule. B. requires that a specific DNA sequence be present. C. requires one of the duplexes undergoing recombination be nicked in both strands. D. involves a…
- QUESTION NO. 1 A transition mutation A. occurs when a purine is substituted for a pyrimidine or vice versa. B. results from the insertion of one or two bases into the DNA chain. C. is most frequently caused by chemicals (like acridine) that intercalate into DNA. D. results from substitution of one purine for another or of one pyrimidine for another. E. always is a missense mutation QUESTION NO. 2 Degeneracy of the generic code denotes the existence of A. multiple codons for a single amino acid. B. codons consisting of only two bases. C. base triplets that do not code for any amino acid. D. different systems in which a given trip let codes for different amino acids. E. codons that include one or more of the unusual bases. QUESTION NO. 3 Replication A. requires that a phosphodiester bond of the incoming dNTP be hydrolyzed in order to be added to the growing chain. B. uses 5' to 3' polymerase activity to synthesize one…Question-1 During DNA replication, a.No errors occur b.only one strand of the molecule acts as a template c.Both strands of a molecule act as templates. d.The reaction is catalyzed by RNA polymeraseQUESTION 25 What is the most common type of DNA sequence present in eukaryotic genomes? A. Repetitive DNA sequences B. Minisatellites C. Exons of genes encoding proteins D. Introns of genes encoding proteins
- QUESTION 9 These are enzymes that untwist the double helix at the replication forks of replicating DNA. Helicases Stingle-strand binding proteins Topoisomerase TelomeraseQUESTION 12 The leucine zipper domain of transcription factors is not involved in DNA recognition but rather in facilitating dimerization. Given the chemical properties of the amino acid leucine, dimerization of transcription factors via this domain by (select the correct option). Facilitating hydrogen bonding with the aqueous environment. Chelation of bivalent ions such as Zn2+. Formation of coiled-coils through hydrophobic non-covalent interactions between evenly spaced Leu residues in alpha-helical domains. Physically connecting the two transcription factor subunits through unstructured loops.Question 46 The degeneracy of the genetic code most often involves: the third base of the codon the second base of the codon the first base of the codon two bases of the codon Question 47 Immunological memory is an important feature of: the adaptive immune system the innate immune system Neutrophils macrophages
- QUESTION 27 Which of the following methods can be used to compare the amounts of one specific mRNA that is expressed by two different cell lines? A. Immunohistochemistry B. Western blotting C. Polymerase chain reaction (PCR) D. ImmunocytochemistryQUESTION 21 What is a promoter? The site where the ribosome begins translation The site where RNA polymerase attaches to the DNA in front of the gene. The site where DNA replication begins The site where Okazaki fragments are linked togetherQuestion 1: tRNA and amino acyl tRNA synthetases Part a: How many codons encode the amino acid Isoleucine (Ile, I)? Part b: How many codons encode the amino acid Valine (Val, V)? Part c: How many codons encode the amino acid Methionine (Met, M)? Part d: How many tRNAs decode the Ile codons? Part e: How many tRNAs decode the Val codons? Part f: How many tRNAs decode the Met codon?