Gene expression introduction

What is the primary function of DNA in cells?

• To store energy

• To provide structural support

• To store coded information for protein synthesis

• To transport nutrients

How many different mononucleotides are used to make DNA?

• 2

• 3

• 4

• 5

Which of the following is NOT a nitrogenous base found in DNA?

• Adenine

• Thymine

• Uracil

• Cytosine

How many molecules of DNA are found in the nucleus of most human cells?

• 23

• 46

• 92

• 12

What are the sections of chromosomes that code for proteins called?

• Nucleotides

• Ribosomes

• Genes

• Chromatids

Approximately how many protein-coding genes are in the human genome?

• 10,000

• 20,000

• 30,000

• 40,000

Where are ribosomes that make proteins found?

• Only in the nucleus

• Only in the cytoplasm

• In the cytoplasm and attached to the rough endoplasmic reticulum

• Only in the mitochondria

What is the role of mRNA in protein synthesis?

• To store energy

• To act as a messenger carrying the code from DNA to ribosomes

• To provide structural support

• To transport nutrients

What is the process of making an mRNA copy of a single gene called?

• Translation

• Replication

• Transcription

• Mutation

How many strands of nucleotides does mRNA have?

• 1

• 2

• 3

• 4