Practice Quiz for
Molecular Level of Genetics

No. of Questions= 17
INSTRUCTIONS: To answer a question, click the button in front of your choice. A response will appear in the window below the question to let you know if you are correct. Be sure to read the feedback. It is designed to help you learn the material. You can also learn by reading the feedback for incorrect answers.

1 ________________ are organic molecules that have the function of starting and regulating chemical reactions.
a)  carbohydrates
b)  lipids
c)  enzymes
d)  endoplasmic reticula
2 Amino acids are the building blocks of:
a) DNA and RNA
b) lipids
c) proteins
d) carbohydrates
3 There are ________ different kinds of amino acids.
a) 20
b) 46
c) 100
d) 20,000-25,000
4 The largest molecules in our bodies are:
a) nucleic acids
b) chromosomes
c) proteins
d) amino acids
5 Which of the following statements is true?
a) Each DNA molecule is a single gene.
b) DNA molecules are in the shape of a double helix.
c) mRNA molecules are in the shape of a double helix.
6 The human body is composed mostly of:
a) calcium, iron, phosphorus, and zinc
b) oxygen, hydrogen, calcium, and iron
c) oxygen, nitrogen, hydrogen, and carbon
7 Which of the following statements is true about DNA?
a) At the beginning of protein synthesis, a section of a DNA molecule unwinds and unzips.
b) All of our DNA is normally located in the nucleus of our cells.
c) DNA is composed of amino acids, phosphates, sugars, and bases.
8 Which of the following statements is true about the protein synthesis process?
a) When a section of a DNA molecule unwinds and unzips along its bases, a transfer RNA forms by copying one side of the DNA.
b) The transfer RNA leaves the nucleus and goes out to the ribosomes in the cytoplasm where proteins are assembled with the help of messenger RNA.
c) Both statements are false
9 Which of the following occurs at the ribosomes?
a) Most of a cell's DNA molecules are stored there.
b) Proteins are produced there.
c) mRNA are produced there.
10 Each tRNA anticodon has three bases. The three base combinations are codes for attracting specific kinds of:
a) endoplasmic reticula
b) ribosomes
c) amino acids.
11 Which of the following statements is true about DNA replication?
a) One DNA molecule becomes two identical ones as a result of this process.
b) It occurs during meiosis but not mitosis.
c) It is part of the protein synthesis process.
12 A DNA codon consists of:
a) one nucleotide
b) three nucleotides
c) hundreds or even thousands of nucleotides
13 A gene is essentially a:
a) sequence of many codons in a DNA molecule
b) single codon in a DNA molecule
c) chromosome
14 There are about 3 billion chemical base pairs in human DNA. Approximately what percent of these base pairs actually code for genes? 
a) 100%
b) 30-50%
c) 1-2%
15 Portions of DNA molecules that do not contain the codes for proteins are called:
a) introns
b) exons
c) mutagens
16 Which of the following statements is true regarding the DNA code?
a) Each of the 64 types of codons in DNA and RNA code for a different amino acid.
b) Not all codons specify amino acid components to be included in a protein.
c) DNA replication has a built-in mechanism that prevents or corrects all errors.
17 The DNA code is:
a) unique to humans
b) found only in mammals
c) shared by all living things



Copyright 1999-2012 by Dennis O'Neil. All rights reserved.