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Biology - Unit 5 > Structure Of Ribonucleic Acid > Flashcards

Flashcards in Structure Of Ribonucleic Acid Deck (19):
0

What sort of RNA transfers the DNA code from the nucleus to the cytoplasm?

Messenger RNA (mRNA)

1

How comes mRNA can leave the nucleus but the DNA cannot?

The mRNA is small enough to move through the nuclear pores

2

What is the genetic code?

A sequence of nucleotide bases

3

What is a codon?

A sequence of three bases on mRNA that code for a single amino acid

4

What are stop codons?

Codons that mark the end of a polypeptide chain and do not code for an amino acid

5

What are the three key features of the genetic code?

It is degenerate, Non-overlapping and is a universal code

6

What is the degenerate code?

This means that most amino acids have more than one codon

7

What is meant by non-overlapping?

Each base is only read one

8

Explain the idea of a universal code?

The same codons code for the same amino acids in all organisms

9

What is RNA?

A polymer made up of repeating mononucleotide sub-units

10

What type of sugar is found in RNA?

A pentose sugar (Ribose)

11

What are the four bases found in RNA?

Adenine, Guanine, Cytosine and Uracil

12

What else is present in RNA?

A phosphate group

13

Other than mRNA what is another type of RNA?

Transfer RNA (tRNA)

14

Describe the shape of tRNA

A single stranded chain folded into a clover-leaf shape, with one end of the chain extending beyond the other

15

What does tRNA carry?

Amino acids

16

What is found at the end of a tRNA molecule that consists of three organic bases?

The anticodon

17

What is the anticodon complimentary to?

The codon on mRNA

18

What pairs with adenine on RNA?

Uracil