Portage Learning Chem 210 - Module 6 exam.

Question 1 3 / 3 pts In RNA, guanine always pairs with ________. Thymine Guanine Cytosine Uracil Both A and B CYSTOSINE Question 2 3 / 3 pts DNA is built from which of the following? Nucleosides Genes ...

Question 1 3 / 3 pts In RNA, guanine always pairs with ________. Thymine Guanine Cytosine Uracil Both A and B CYSTOSINE Question 2 3 / 3 pts DNA is built from which of the following? Nucleosides Genes Purines Nucleotide Codons NUCLEOTIDE Question 3 3 / 3 pts The Z-form helix of DNA is stabilized mainly by __________. Ionic bonds Covalent bonds Hydrogen bonds Ion-dipole bonds Hydrogen covalent bonds HYDROGEN BONDS Question 4 3 / 3 pts . Which of the following pentose sugars is a constituent of mRNA? Ribose Xylose Ribitol 2-deoxyribose Arabinose RIBOSE Question 5 3 / 3 pts 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 Question 6 3 / 3 pts Identify the base guanine from among the following structures. A. B. C. D. E. D Question 7 3 / 3 pts 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 Question 8 3 / 3 pts Identify the complementary bases from the following. Adenine-Cytosine ! Adenine- Thymine Guanine-Thymine Guanine-Adenine Cytosine-Uracil ADENINE-THYMINE Question 9 3 / 3 pts How many hydrogen bonds are made between T and its complementary nucleotide? 2 3 4 5 6 2 Question 10 3 / 3 pts 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’ Question 11 3 / 3 pts Which of the following types of RNA functions as the molecule to bring amino acids to ribosomes? mRNA gRNA rRNA snRNA tRNA tRNA Question 12 3 / 3 pts Which of the following is the set of three sequential nucleotides that encodes for a particular amino acid? Codon Anticodon Allele Gene Chromosome CODON Question 13 3 / 3 pts A type of DNA that has a right-handed helix is the A-form X-Form C-form L-form Z-form A-FORM Question 14 3 / 3 pts 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 Question 17 0 / 3 pts 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 Question 18 3 / 3 pts 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’ Question 19 3/ 3 pts 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 Question 20 3 / 3 pts In the tRNA, below, the amino acid is attached to which position? A Question 21 3 / 3 pts 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 Question 23 3 / 3 pts Which of the following is heterocyclic? A. B. C. D. Both B and C E. None of the above C Question 24 3 / 3 pts A major component of RNA but not DNA is: AMP GMP UMP CMP TMP UMP Question 25 3 / 3 pts On the following molecule, which letter (A, B, C, D, or E) indicates the 5’ end? B Question 26 5 / 5 pts (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. Question 27 4 / 5 pts (Short answer) Briefly describe how noncovalent interactions contribute to the threedimensional 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