Y11 SL Review Quiz For January Exam

Which scientist(s) first proposed that adenine pairs with thymine and cytosine pairs with guanine?

• Rosalin Franklin

• Watson & Crick

• Erwin Chargaff

• Meselson & Stahl

If DNA replicated conservatively what type(s) of DNA would have been true of Generation 1 (tube 2) of Meselson and Stahl's experiment?

• All DNA molecules would contain one heavy strand and one light strand

• Half of the DNA molecules would contain two heavy strands and half would contain two light strands

• All DNA molecules would contain two light strands

• Half of the DNA molecules would contain two heavy strands and half would contain a heavy strand and a light strand

Which of the following does not happen during DNA replication?

• DNA helicase unwinds DNA

• DNA polymerase joins nucleotides on the new strand

• Only one strand acts as a template

• Free nucleotides attach by complementary base pairing

Which of the following are true of the DNA pyrimidine bases?

I. they are cytosine and thymine

II. they contain one ring

III. they contain nitrogen

• I and II only

• I and III only

• II and III only

• I, II and III

Which of the following is true of both DNA and RNA?

• They contain thymine

• They have a ribose-phosphate backbone

• They are polynucleotides

• They are double stranded

Which of the following DNA base sequences corresponds to a tRNA molecule that has the anticodon ACU?

• ACU

• ACT

• UGA

• TGA

Which of the following is/are involved in translation?

I. RNA polymerase

II. Thymine

III. tRNA

• I and III only

• II and III only

• III only

• I, II and III

Why is the genetic code said to be degenerate?

• the same mRNA codons code for the same amino acids in all organisms

• different mRNA codons can code for different amino acids

• different mRNA codons code for different amino acids in all organisms

• different mRNA codons can code for the same amino acid

Which of the following are connected by hydrogen bonds?

I. adenine and thymine

II. non-adjacent amino acids in a protein's secondary structure

III. the oxygen and hydrogen atoms in a water molecule

• I and II only

• I and III only

• II and III onlu

• I, II and III

What is the correct order for the following events during translation?

I. a peptide bond forms between amino acids

II. ribosome moves one codon along

III. previous tRNA molecule detaches from the ribosome

• I --> II --> III

• I --> III --> II

• II --> I --> III

• II --> III --> I