Biochemistry 2280A Chapter 5: Topic 14 Textbook Notes
49 views9 pages
6 Jul 2016
School
Department
Course
Professor
Document Summary
Qs: 5-1, 5-3, 5-5, 5-7, 5-8, 5-11b, 5-15. Cells use amino acids to build proteins polymers made of amino acids which are joined head to tail in a long chain that folds up into a 3d structure that is unique to each type of protein. Nucleotides are the subunits of dna and rna. Dna and rna are built from subunits called nucleotides. Nucleosides: made of a nitrogen containing ring compound linked to a 5-carbon sugar (either ribose or deoxyribose) Nucleotides are nucleosides that have one or more phosphate groups attached to the sugar, and come in 2 main forms: those with ribose are ribonucleotides and those with deoxyribose are deoxyribonucleotides. The nitrogen containing rings of all these molecules are generally referred to as bases. Pyrimidines which derive from a 6 membered pyrimidine ring and include cytosine (c), thymine (t), and uracil (u).
Get access
Grade+
$40 USD/m
Billed monthly
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
10 Verified Answers
Class+
$30 USD/m
Billed monthly
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
7 Verified Answers
Related Documents
Related Questions
QUESTION 1. Compared to eukaryotic genomes, only prokaryotic genomes:
A. contain DNA organized by histones. |
B. contain usually one, circular chromosome. |
C. contain plasmid DNA. |
D. have chromosomes contained in a nucleus. |
QUESTION 2. Azathioprine is a drug that may be prescribed to transplant recipients to reduce the chance of tissue rejection reactions. In its active state, it acts as a purine analogue, inhibiting DNA biosynthesis. This means that 6-mercaptopurine will be inserted in place of a purine containing nucleotides during DNA replication. Given this drug's mode of action, you would expect it to be incorporated into DNA in place of:
A. nucleotides containing guanine or cytosine. |
B. nucleotides containing adenine or thymine. |
C nucleotides containing adenine or guanine. |
D. nucleotides containing guanine nucleotide or uracil. |
QUESTION 3. RNA is distinguished from DNA because only RNA:
A. typically exists as a single-stranded molecule. |
B. has a 3' to 5' directionality. |
C. is composed of nucleotides that contain the sugar deoxyribose. |
D. is composed of nucleotides that contain the nitrogen bases T, C, G, and A. |
QUESTION 4. How are RNA nucleotides different from DNA nucleotides? To be marked correct, you'll need to select all true statements, as there may be more than one correct answer.
A. RNA nucleotides do not contain thymine. |
B. RNA nucleotides use the sugar ribose, while DNA nucleotides do not. |
C. RNA nucleotides lack phosphate. |
D. RNA nucleotides incorporate pyrimidine nitrogen bases, while DNA nucleotides only incorporate purine nitrogen bases. |