Higher Human Unit 1 Check

Which two units make up the backbone of DNA

• Ribose sugar

• Deoxyribose sugar

• Phosphate

• Bases

Which base pairing is correct?

• Adenine to Guanine

• Cytosine to Thymine

• Adenine to Thymine

• Guanine to Thymine

What are primers?

• Single stranded random sequences of nucleotides

• Single stranded sequences of nucleotides which are complementary to a target sequence

• Double stranded random sequences of nucleotides

• Double stranded sequences of nucleotides which are complementary to a target sequence

Which enzyme is used to join fragments on the lagging strand?

• RNA polymerase

• DNA polymerase

• Ligase

• Catalase

Why can both strands of DNA not be replicated continuously?

• DNA nucleotides can only be replicated in a 3'-5' direction

• DNA polymerase can only act on one strand at a time

• There is not enough space for both strands to be copied

• DNA nucleotides can only be replicated in a 5'-3' direction

What type of reaction builds up larger molecules from smaller ones?

• Catabolic

• Inhibition

• Anabolic

What type of inhibition occurs when an inhibitor molecule binds to the active site of the enzyme and stops the substrate from binding?

• Feedback inhibition

• Non-competitive inhibition

• Competitive inhibition

What is the type of inhibition that occurs when an inhibitor binds to a different part of the enzyme and changes the active site shape?

• Feedback inhibition

• Non-competitive inhibition

• Competitive inhibition

Which coloured line indicates the reaction rate of a competitive inhibitor?

• Purple

• Orange

• Green

What type of RNA carries a copy of the genetic code from the nucleus to the ribosome for protein synthesis?

• mRNA

• tRNA

• rRNA