Term
| Name the 3 parts of a nucleotide |
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Definition
pentose sugar, phosphate group nitrogenous base |
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Term
| Insert the missing words "nucleotides may join together by ...............reactions to form ..................such as .........or............ |
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Definition
condensation polynucleotides DNA/RNA |
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Term
| List the 4 organic bases in RNA |
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Definition
| Cytosine, Guanine, Adenine and Uracil |
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Term
| Biochemical analysis of a sample of elephant DNA showed it to contain 33% guanine. What would be the % of Adenine in the sample? |
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Definition
17% (33+33=66 G+C so A=T=34 so A = 34/2) |
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Term
| In which stage of the cell cycle does DNA replication take place? |
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Definition
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Term
| What is meant by semi-conservative replication? |
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Definition
| When DNA replicates to form two double helices, each double helix has one original (conserved) strand and one newly synthesised strand |
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Term
Identify the 3 forms of RNA from their descriptions i) formed in the nucleus it carries the genetic code from DNA ii) a clover-leaf shaped molecule that transports amino acids to mRNA iii) Together with proteins this forms ribosomes. |
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Definition
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Term
This is the sequence of bases in a strand of DNA fro part of a gene: GGTCACTTCGAGCCC a) What is meant by the term Gene? b)What sequence of bases in mRNA would this code for? |
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Definition
a) A gene is a sequence of bases in DNA that codes for the synthesis of a particular polypeptide or protein b)CCAGUGAAGCUCGGG |
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Term
How many different triplets can be produced by the 4 types of base in DNA? |
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Definition
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Term
| Why is the genetic code sometimes described as degenerate? |
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Definition
| Because more than one triplet can code for the same amino acid |
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Term
| What is meant by transcription? |
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Definition
| The copying of the genetic code from a gene on DNA to a strand of messenger RNA |
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Term
What was the original DNA sequence transcribed by this mRNA sequence: AGGUUCUUUCGAAGC |
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Definition
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Term
| wHERE DOES THE PROCESS OF TRANSLATION TAKE PLACE? |
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Definition
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Term
These tRNA anticodons carry the specific amino acids: CAC-valine, UUC-lysine,GGU-proline and GAG-leucine What amino acid is coded for by the gene with : GGTCACTTCGAG ? |
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Definition
| Proline-valine-lysine-leucine |
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