BIOL 1010 Lecture Notes - Lecture 4: Deoxyribose, Ribose, Guanine
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14 May 2017
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Bio 1010 from their parents consists of dna. There is a second type rna, dna is transcribed into rna, the. Rna molecule moves out of the nucleus and interacts with the protein building machinery of the cell. The monomers that make up nucleic acids are nucleotides. At the centre is a five carbon sugar, the sugar is deoxyribose, whereas rna is just ribose. Dna has four nitrogenous bases: adenine, thymine, cytosine, and guanine, a links to t, c links to g. in rna u is found instead of t. Rna is a single strand where as dna is a double helix. 3. 14: fats are lipids that are mostly energy storage molecules. Lipids are diverse compounds that are grouped together because they share one trait, they do not mix well with water. Consists mainly of carbon and hydrogren atoms linked by nonpolar covalent bonds. Fat is a large lipid made from two kinds of smaller molecules: glycerol and fatty acids.
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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. |