PORTAGE LEARNING CHEM 210-MODULE 6 EXAM

PORTAGE LEARNING CHEM 210 - MODULE 6 EXAM. In RNA, guanine always pairs with . Thymine Guanine Cytosine Uracil Both A and B CYSTOSINE DNA is built from which of the following? Nucleosides Genes Purines Nucleotide Codons NUCLEOTIDE The Z-form helix of DNA is stabilized mainly by . Ionic bonds Covalent bonds Hydrogen bonds Ion-dipole bonds Hydrogen covalent bonds HYDROGEN BONDS Which of the following pentose sugars is a constituent of mRNA? Ribose Xylose Ribitol 2-deoxyribose Arabinose RIBOSE Purines have ring(s), (each) containing nitrogen(s), whereas pyrimidines have ring(s), (each) containing nitrogen(s). 1; 1; 1; 1 1; 2; 1; 2 2; 1; 1; 2 2; 2; 1; 1 2; 2; 1; 2 2; 2; 1; 2 Identify the base guanine from among the following structures. A. B. C. D. E. D Which of the following nucleic acids is responsible for using the encoded genetic information to produce proteins found in living organisms? Peptide nucleic acid Ribonucleic acid Ribitol nucleic acid Deoxyribonucleic acid Glycerol nucleic acid RIBONUCLEIC ACID Identify the complementary bases from the following. Adenine-Cytosine Adenine- Thymine Guanine-Thymine Guanine-Adenine Cytosine-Uracil ADENINE-THYMINE How many hydrogen bonds are made between T and its complementary nucleotide? 2 3 4 5 6 2 The base sequence along one strand of DNA of 5’-GCATGAGCC-3’. What is the sequence of the complementary strand of DNA? 5’-CTAGTCCGC-3’ 3’-CGTACTCGG-5’ 3’-CTAGTCCGC-5’ 3’-CAGTCAGCT-5’ 5’-CTGACTACG-3’ 3’-CGTACTCGG-5’ Which of the following types of RNA functions as the molecule to bring amino acids to ribosomes? mRNA gRNA rRNA snRNA tRNA tRNA Which of the following is the set of three sequential nucleotides that encodes for a particular amino acid? Codon Anticodon Allele Gene Chromosome CODON A type of DNA that has a right-handed helix is the A-form X-Form C-form L-form Z-form A-FORM Which of the following is a second messenger in cells? FAD cAMP AMP dATP UTP cAMP functions as a protein coenzyme. ATP AMP FAD cAMP GGG FAD rRNA makes up about percent of ribosomes. 35 65 20 90 15 65 The conclusion that G and C are present in DNA in equimolar amounts is credited to . James Watson Francis Crick Erwin Chargaff Both A and B None of the above ERWIN CHARGAFF The primary sequence of DNA is written . N to C C to N 5’ to 3’ 3’ to 5’ Both A and D 5’ to 3’ In the Watson-Crick model for the double helix, which statement is NOT true? The two strands run parallel to one another The base-pairing occurs on the inside of the double helix. The double helix (B form) is right-handed. Two grooves that run up the sides of the helix. The two strands have complementary sequences. THE TWO STRANDS RUN PARALLEL TO ONE ANOTHER In the tRNA, below, the amino acid is attached to which position? A Besides ATP, which other nucleotide is part of energy storage in cells? ATP UTP TTP CTP GTP GTP Which of the following is a nucleoside? A. B. C. D. E. Both A and C E.BOTH A AND C Which of the following is heterocyclic? A. B. C. D. Both B and C E. None of the above C A major component of RNA but not DNA is: AMP GMP UMP CMP TMP UMP On the following molecule, which letter (A, B, C, D, or E) indicates the 5’ end? B (Short answer) Scientists say that two DNA strands are complementary. Briefly describe what is meant by complementary. Show one example in your response. The nucleotide sequences of complementary strands are such that, whenever an A occurs in one strand, there is a T in the other strand with which it can form a hydrogen-bonded base pair. Whenever a C occurs in one strand, a G occurs in the other. A is the base that is complementary to T, and C is the base complementary to G. (Short answer) Briefly describe how noncovalent interactions contribute to the three- dimensional shapes and structures of RNA molecules. Hydrogen bonding in regions of complementarity within an RNA chain can result in the formation of a structure. If no complementary regions exist, then an unstructured area will exist within the RNA. Question 28 5 / 5 pts (Short answer) In one sentence, identify the most noticeable difference between the A-form of DNA and the Z form of DNA. A-form is a right-handed helix while the Z-form of DNA is a left-handed helix. Question 29 5 / 5 pts (Fill in the blanks) In nucleic acid chemistry, compounds that contain an organic nitrogen-containing base, a sugar, and phosphate group are called A . Two purines found in DNA in are B and B . A pyrimidine found in all RNA but not in DNA is C . In DNA, the pair D is held together by three hydrogen bonds. In DNA, the pentose E serves as the monosaccharides. A) Nucleotides B) adenine and guanine C) Uracil D) G-C E) 2-deoxyribose Question 30 5 / 5 pts (Short answer) The monomers of RNA nucleic acids, called nucleotides, consist of three parts. What are those three parts? (Give three) Your Answer: phosphoric acid, ribose (a pentose sugar) and an organic base.