protein synthesis

Question 1

what’s a retrovirus

Answer 1

a virus that has RNA containing its genetic material rather than DNA

Question 2

whats pre-mRNA

Answer 2

contains both introns and exons

Question 3

what happens after mRNA complementary base paired with bases on DNA template strand/ after pre-mRNA mol has been formed

Answer 3

-H bonds between bases on DNA and mRNA break
-H bonds between complementary bases of both original DNA strands form again
-DNA wound into helix again

Question 4

what enzyme catalyses production of phosphodiester bonds between mRNA nucleotides

Answer 4

RNA polymerase

Question 5

where does transcription take place in prokaryotic cells

Answer 5

the cytoplasm as they don’t have a nucleus

Question 6

what is the first step of transcription

Answer 6

DNA helicase attaches to unwind double helix, exposing the bases
so bases on strand directed in 5’ 3’ direction can be paired with

Question 7

what is key about tRNA when it comes to protein structure

Answer 7

each tRNA anticodon codes for a specific amino acid, carries that specific amino acid to ribosomes

Question 8

codon and anticodon definition

Answer 8

codon=sequence of 3 nucleotides that codes for a specific amino acid

anticodon=sequence of 3 nucleotides, specific to tRNA, complementary to codon and codes for a specific amino acid