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TLS Online TPP Program

#Question id: 67

When a region of DNA must be repaired by removing and replacing some of the nucleotides, what ensures that the new nucleotides are in the correct sequence?

#SCPH06 I Botany

  1. DNA cannot be repaired and this explains why mutations occur.

  2. The new nucleotides base pair accurately with those on the complementary strand.

  3. The repair enzyme recognizes the removed nucleotide and brings in an identical one to replace it.

  4. The three-dimensional structure determines the order of nucleotides.

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TLS Online TPP Program

#Question id: 5215

#SCPH28 | Zoology

What is it about short tandem repeat DNA that makes it useful for DNA fingerprinting?
TLS Online TPP Program

#Question id: 3891

#SCPH06 I Botany

Protein amino acid side chains can hydrogen bond in the major groove of DNA, and discriminate between each of the four possible base pairs.  In which one of the following groups of amino acids can all three members potentially be used in such DNA-protein recognition?
TLS Online TPP Program

#Question id: 3650

#SCPH28 | Zoology

Which of the following is true for the most important form of DNA damage which produces pyrimidine dimers from adjacent pyrimidine bases?
TLS Online TPP Program

#Question id: 11964

#I Life Science/ Life Sciences Group – I-V

 Animals cannot produce enzymes to digest cellulose, yet many termite species consume cellulose from plant material as a main part of their diet. How do termites access the nutrients contained in cellulose?
TLS Online TPP Program

#Question id: 752

#I Life Science/ Life Sciences Group – I-V

The A260/A280 ratio of a double-stranded DNA sample can be used to assess its purity. The value for the pure DNA is ----------------