2019 p2

Question 1

explain why long-sighted person has difficulty seeing near objects clearly

Answer 1

because light focuses behind the retina
-as lens cannot thicken enough

Question 2

what lens can be used in spectacles to treat myopia

Answer 2

concave lenses

Question 3

2 steps of protein synthesis

Answer 3

transcription and translation

Question 4

what is transcription

Answer 4

take a single gene of dna and copy into a structure called mrna

Question 5

what is translation

Answer 5

take mrna strand and change into protein

Question 6

differences between mRNA and DNA

Answer 6

mRNA is:
-shorter than dna
-only a single strand
-contains base uracil instead of thyamine

Question 7

what creates mRNA bases

Answer 7

rna polymerase

Question 8

what are mrna to dna

Answer 8

complimentary

Question 9

whats the dna which mrna move along called

Answer 9

the temporary strand

Question 10

describe steps of how amino acid sequence is assembled used dna base sequence of gene

Answer 10

-strand of mRNA is transcribed from gene in nucleus
-mRNA leaves nuckeus
-mRNA binds to ribosome
-triplet code from mRNA is matched by a complementary tRNA anticodon at ribosome
-tRna transfers amino acids to polypeptide chain in specific order