Practice Questions

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?

#Introduction to Biochemistry

DNA cannot be repaired and this explains why mutations occur.
The new nucleotides base pair accurately with those on the complementary strand.
The repair enzyme recognizes the removed nucleotide and brings in an identical one to replace it.
The three-dimensional structure determines the order of nucleotides.

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TLS Online TPP Program

#Question id: 54

#Introduction to Biochemistry

About 25 of the 92 natural elements are known to be essential to life. Which 4 of these 25 elements make up approximately 96% of living matter?

TLS Online TPP Program

#Question id: 56

#Introduction to Biochemistry

Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by humans and other vertebrates, but not by other organisms such as bacteria or plants?

TLS Online TPP Program

#Question id: 57

#Introduction to Biochemistry

A(n) ________ has charge but negligible mass, whereas a(n) ________ has mass but no charge.

TLS Online TPP Program

#Question id: 58

#Introduction to Biochemistry

A covalent chemical bond is one in which ________.

TLS Online TPP Program

#Question id: 61

#Introduction to Biochemistry

Which of the following correctly describes chemical equilibrium?