rscc ripp quiz 3 chap 11-
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| transcription | The process by which RNA is made from a DNA template. It does not require a primer:template junction.
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| pyrimidines | thymine and cytosine
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| purines | adenine and guanine
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| What are the three different forms of RNA? | Messenger RNA (mRNA) – contains information derived from DNA Transfer RNA (tRNA) – carries amino acids to ribosomes Ribosomal RNA (rRNA) – helps maintain the proper shape of ribosomes.
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| Describe the basic structure of DNA | helical the two strands are complementary and wind around each other bases are purines and pyrimidines It is composed of nucleotides a phosphate, deoxyribose, and a nucleotide base. The strands are anti-parallel 5 to 3 the other 3 to 5
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| What nucleotide based pair with each other in DNA? | adenine pairs with thymine Cytosine pairs with quanine
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| gene | A gene is a segment of DNA that codes for a functional product (for example, a protein).
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| Why is the genetic code said to be degenerate? | some codons code for the same amino acid, and we say that the genetic code is degenerate (or it is redundant).
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| Where does DNA replication start? | A portion of the DNA is paired with a short piece of RNA called a primer to start replication.
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| What is a coden | There are 64 codons and 20 amino acids. Therefore,
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| Describe the basic structure of RNA. How does it differ from DNA? | It contains the sugar ribose (rather than deoxyribose). It contains uracil instead of thymine. Uracil pairs up with adenine. It is usually found in single-stranded form.
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