IB Biology unit 2.7 AHA

The sequence of nucleotides in a section of RNA is:

GCCAUACGAUCG.

What is the base sequence of DNA sense strand?

• CGGUAUGCUAGC

• GCCATACGATCG

• CGGTATGCTAGC

• GCCAUACGAUCG

A certain gene in a bacterium codes for a polypeptide that is 120amino acids long.

How many nucleotides are needed in the mRNA to code for this polypeptide?

• 30

• 40

• 360

• 480

What enzyme is usd in transcription but NOT in translation?

• DNA Polymerase

• Helicase

• Protease

• RNA polymerase

If mRNA has a codon CAU the corresponding anticodon on the tRNA molecule is...

Where does RNA Polymerase bind during the process of transcription?

• The polysome

• The operator

• The promoter

• The initiator

Wat sequence of processes is carried out by the structure labelled X during Translation?

• Combining with an amino acid and then binding to an anticodon

• Binding to an anticodon and then combining with an amino acid

• Binding to a codon and then combining with an amino acid

• Combining with an amino acid and then binding to a codon

What is a codon?

• A sequence of nucleotides on rRNA that corresponds to an amino acid

• A sequence of nucleotides on mRNA that corresponds to an amino acid

• A sequence of nucleotides on tRNA that corresponds to an amino acid

• A sequence of nucleotides on DNA that corresponds to an amino acid

The percentage of thymine in the DNA of an organism is approximately 30%. What is the percentage of guanine?

• 70%

• 30%

• 40%

• 20%

The following diagram shows a short stretch of DNA. What bases are indicated by labels Y and Z?

• Thymine

  Adenine

• Thymine

  Guanine

• Uracil

  Guanine

• Uracil

  Adenine

Which molecules form the nucleotide marked in the diagram?

• phosphate, deoxyribose and nitrogenous base

• phosphorus, ribose and nitrogenous base

• phosphorus, deoxyribose and guanosine

• phosphate, ribose and guanine