Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Unit 1.5 Biology AS Level 🌺 > DNA replication > Flashcards

DNA replication Flashcards

1
Q

what were the 3 theories of dna replication

A

conservative
semi conservative
dispersive

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what is the theory of semi conservative replication

A

each strand of a parental double helix acts as a template for the formation of a new molecule

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is the key points of the DNA replication experiment (3)

A
  • dna bases should contain nitrogen
  • N14 is light, N15 is heavy
  • bacteria uses nitrogen to make the nitrogenous bases found in DNA
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what is the name of DNA replication experiment

A

Meselsohn-Stahl

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

SEMI CONSERVATIVE

A

each strand of a DNA molecule is used as a template for a newly synthesised strand

new DNA molecule will include 1 original strand and 1 newly synthisied strand

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

how many bases code for each amino acid

A

3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

how many amino acids are there?

A

20

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

how many stop codes are there?

A

3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what would happen if one base coded for one amino acid

A

only four amino acids could be made

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what would happen if two bases coded for one amino acid

A

16 combinations

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what would happen if three bases coded for one amino acid

A

64 combinations which is enough for 20 amino acids

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

what are degenerate codes

A

more than one triplet code coding for the same amino acid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

what is the equivilant of dna triplets in RNA

A

rna codons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

what is a non-overlapping code

A

each base only appears in one triplet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

what is a universal code

A

the same in all living organisms

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

definition of stop - codon code

A

acts as a terminating signal

17
Q

defenition of degenerate code

A

more than one triplet code for an amino acid

18
Q

what happens if theres a mutation in the DNA / m RNA

A

triplet code will chane which COULD change the amino acid

19
Q

what parts can mutate

20
Q

exons and introns in prokaryots

A

mRNA directs the synthesis of the polypeptide

21
Q

exons and introns in eukaryots

A

RNA has the be processed before it can be used to synthesise the polypeptide

22
Q

what is the phase before final mRNA

23
Q

what needs to be removed in pre mRNA

24
Q

how are introns cut off

A

using endonucleases

25
Q

intron defenition

A

non coding nucleotide sequence

26
Q

how do you turn pre mRNA to mature

A

remove non coding intron

27
Q

exon definition

A

nucleotide sequence that remains presnt in the final mature mRNA

Unit 1.5 Biology AS Level 🌺 (7 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions