Biology Worksheet - With Answers
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31. A sequence of three nitrogenous bases in a messenger-RNA
Base your answers to questions 5 and 6 on the chart below and
molecule is known as a
on your knowledge of biology.
1) codon
2) gene
3) polypeptide
4) nucleotide
2. The inability of an organism to produce certain proteins can occur
when an organism is lacking an enzyme needed to combine
1) oxygen molecules
2) simple sugars
3) amino acids
4) biological catalysts
5. Which amino acid will be carried to a ribosome by a transfer
3. Which statement indicates one difference between the gene that
RNA molecule containing the triplet code A–A–A?
codes for insulin and the gene that codes for testosterone in
humans?
1) valine
2) lysine
3) leucine
4) phenylalanine
1) The gene for insulin is replicated in vacuoles, while the gene
for testosterone is replicated in mitochondria.
2) The gene for insulin has a different sequence of
6. Which base sequence of a DNA molecule produces a codon on an
molecular bases than the gene for testosterone.
mRNA molecule that will allow the amino acid arginine to be
3) The gene for insulin is turned on in liver cells, but the gene
incorporated into a protein?
for testosterone is not.
1) C – G – A
2) G – C – T
4) The gene for insulin is a sequence of five different
3) C – G – U
4) G – C – U
molecular bases while the gene for testosterone is a
sequence of only four different molecular bases.
4. Four stages in the production of protein molecules in a cell are
listed below.
7. Which is a major difference between messenger RNA molecules
and transfer RNA molecules?
A – Transfer RNA molecules bring amino acids
1) Messenger RNA molecules contain ribose, and transfer
to the ribosome
RNA molecules contain deoxyribose.
B – DNA molecules serve as templates for
2) Messenger RNA molecules function in carrying coded
messenger RNA molecules.
information to the ribosomes, and transfer RNA
C – Messenger RNA molecules move to
molecules function in carrying amino acids to the
ribosomes.
ribosomes.
D – Polypeptides are formed on ribosomes.
3) Messenger RNA molecules contain thymine, and transfer
RNA molecules contain uracil.
Which sequence best represents the correct order of these stages?
4) Messenger RNA molecules function when they are
1) A
B
C
D
2) B
C
A
D
double-stranded, and transfer RNA molecules function
3) C
B
A
D
4) D
B
A
C
when they are single-stranded.
8. DNA controls cellular activities most directly by coding for the
synthesis of
1) inorganic compounds
2) enzymes
3) carbohydrates
4) fatty acids
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