L1 - Molecular Genetics

Question 1

Genome

Answer 1

Contains genetic info of an organism

Question 2

Gene

Answer 2

Basic unit of inheritance

Ie : sequence of a protein

Question 3

BACK bone of nuclei acids like DNA & RNA

Answer 3

Sugar phosphate back bone has a negative charge

Question 4

Exons
Introns
Splicing

Answer 4

Bits of DNA (both) exons contain protein coded sequence introns do NOT

REMOVAL of intron = splicing

Question 5

Tandem repeats

Answer 5

• Repeated sections of DNA one after the other ie immediately
• Occur at centromeres & telomeres (ends of chromosomes)

Question 6

Reverse transcriptase

Answer 6

Reverse of transcription

mRNA — DNA

Question 7

Note when mRNA is synthesised

Answer 7

It contains introns that must be spliced — this is called PRE mRNA

mRNA – introns have been SPLICED out

Question 8

Function of telomerase

Answer 8

Repairs ends of chromosomes (telomeres)

As they can never be fully 100% copied

Question 9

Parasitic DNA

Answer 9

Has no real function

May be NB in future tho