Exam 4 Genetics

Question 1

Whats the molecular difference between Ribose and Deoxyribose?

Answer 1

Ribose has an -OH at its 2’ carbon

Question 2

What is RNA pol?

Answer 2

Catalyzes the addition of each ribonucleotide to the 3’ end of the nascent strand of RNA.
-DNA dependent RNA polymerase

Question 3

What is mRNA function?

Answer 3

Used to encode the polypeptide sequence.
-May be polycistronic in bacteria and archaea.
-Encodes single polypeptides in all eukaryotes

Question 4

What is rRNA function?

Answer 4

-helps form large and small ribosomal subunits that unite for translation of mRNA

Question 5

What is tRNA function?

Answer 5

Carries amino acids to ribosomes and bind there to mRNA by complementary base pairing to add amino acids to the elongating polypeptide

Question 6

What is snRNA fucntion?

Answer 6

In eukaryotic nuclei. Joins with proteins to create spliceosomes to remove introns

Question 7

What is miRNA function?

Answer 7

Eukaryotic regulatory RNAs that base pair to certain mRNAs to alter their stability and efficiency of translation

Question 8

What is siRNA function

Answer 8

Eukaryotic regulatory RNAs made from long ds molecules that are cut into short pieces to regulate mRNA stability and translation