4.1 Dna Gnes

Question 1

DNA is short & circular

Answer 1

Pro

Mitch

Question 2

DNA is associated with proteins called histones

Answer 2

Euk

Question 3

DNA is not associated with proteins

Answer 3

Pro

Mitch

Question 4

DNA is long & linear

Answer 4

Euk

Question 5

Chromosomes are formed from this DNA which is associated with histones

Answer 5

Euk

Question 6

1. What is a gene?

Answer 6

A base sequence of DNA that codes for the amino acid sequence of a polypeptide or for a functional RNA

Question 7

1. What is a ‘locus’?

Answer 7

The position of a gene on a chromosome

Question 8

Universa

Answer 8

a. The same three bases code for the same amino acid in all organisms

Question 9

Non-overlapping

Answer 9

a. Each base is only part of one ‘triplet’ (it is only ‘read’ once)

Question 10

Degenerate: So

Answer 10

ome amino acids are coded for by more than one set of three base

Question 11

1. What is an exon?

Answer 11

A base sequence within a gene which codes for a sequence of amino acids

Question 12

1. What is an intron?

Answer 12

1.

A base sequence within a gene which is non-coding

Question 13

1. What is meant by a ‘non-coding’ base sequence?

Answer 13

1. What is a “non-coding multiple repeat base Does not code for amino acid/tRNA/rRNA;

Question 14

1. What is a “non-coding multiple repeat base sequence”

Answer 14

short sequence of bases which repeats a number of times, e.g. CAGCAGCAGCAG, or ATATATAT
These can be found between genes and do not function as sequences that code for amino acids