Free Practice Quiz Question List

5 Genetics and Molecular Biology Online Quiz Questions

Use this free practice quiz with 20 questions to review 5 Genetics and Molecular Biology, test your knowledge, and prepare for your next test or exam.

20 questions

Choose one

1 point

After semiconservative DNA replication, what does each resulting DNA molecule contain?

A
Each resulting DNA molecule contains two newly made strands.
B
Each resulting DNA molecule contains one original strand and one newly made strand.
C
One resulting DNA molecule contains both original strands, and the other contains both new strands.
D
Each resulting DNA molecule contains two original strands.

True or false

1 point

DNA polymerase proofreading and DNA-repair systems prevent every DNA-copying error.

A
True
B
False

Written response

1 point

What RNA base sequence is transcribed from the DNA template segment 3′-TAC-5′?

Fill in the blank

1 point

In typical eukaryotic RNA processing, are removed from the initial transcript, and are joined.

Choose one

1 point

During translation, what role does a transfer RNA (tRNA) perform?

A
They remove introns from RNA in the nucleus.
B
They copy a DNA template to produce mRNA.
C
They match anticodons to mRNA codons and deliver amino acids to the ribosome.
D
They join DNA fragments during replication.

Written response

1 point

Two parents with genotype Aa have offspring under the simple inheritance model described. What is the probability that an offspring has genotype aa? Enter the probability as a decimal between 0 and 1.

True or false

1 point

A mutation in an ordinary body cell is generally passed to an individual's offspring.

A
True
B
False

Choose all

1 point

A coding sequence gains or loses a number of bases that is not a multiple of three. Which consequences are supported? Select all correct answers.

A
It can shift the reading frame.
B
It can change many downstream codons.
C
It is always inherited if it occurs in any body cell.
D
It can affect only one amino acid.

Fill in the blank

1 point

At a replication fork, DNA polymerase synthesizes DNA in the direction. The short fragments made on one strand are later joined by .

Choose one

1 point

A characteristic is influenced by both inherited alleles and environmental conditions. Which statement best describes that characteristic?

A
It is an observable characteristic that can reflect both genes and environment.
B
It is the set of alleles an individual carries for a gene.
C
It is the location of a gene on a chromosome.
D
It is the process by which DNA is copied.

Choose all

1 point

Which statements about dominance are supported? Select all correct answers.

A
Dominance describes how alleles affect a particular trait in a heterozygote.
B
A dominant allele is not necessarily more common than a recessive allele.
C
A dominant allele is necessarily stronger or better than a recessive allele.
D
A dominant allele must be expressed in every possible genetic context.

Written response

1 point

What is the genetics term for the particular location a gene occupies on a chromosome?

Choose one

1 point

Which statement best describes how chromosome location affects the inheritance of genes during meiosis?

A
Alleles of a gene are always passed together into the same reproductive cell.
B
Different chromosome pairs usually assort independently, but nearby genes on the same chromosome can be inherited together more often.
C
Every pair of genes is inherited independently, regardless of chromosome location.
D
Homologous chromosomes remain paired in each reproductive cell after meiosis.

Open ended

1 point

Compare a substitution with an insertion or deletion in a coding DNA sequence. Explain how their possible effects differ, including what may happen when an insertion or deletion is not a multiple of three bases.

True or false

1 point

A mutation occurs in an ordinary body cell that does not contribute to eggs or sperm. Is this mutation generally passed to the individual's offspring?

A
True
B
False

Choose one

1 point

RNA polymerase transcribes the DNA template segment 3′-TAC-5′. Which RNA segment is produced?

A
5′-UAC-3′
B
5′-AUG-3′
C
5′-ATG-3′
D
3′-AUG-5′

Choose one

1 point

A eukaryotic cell processes an initial RNA transcript before translation. Which change typically occurs?

A
Introns are joined, and exons are removed.
B
Both introns and exons are removed.
C
Introns are removed, and exons are joined.
D
Introns and exons remain unchanged.

Written response

1 point

During DNA replication, which enzyme joins the short fragments formed on one strand?

Choose one

1 point

A coding sequence gains one nucleotide. What is a likely consequence for translation of the sequence downstream of the insertion?

A
It always leaves the amino-acid sequence unchanged.
B
It changes only the first amino acid and leaves later codons in the same frame.
C
It creates a second DNA strand with a different base-pairing rule.
D
It can shift the reading frame and change many downstream codons.

Choose one

1 point

For a particular trait, what does it mean to say allele A is dominant over allele a?

A
It describes how the alleles affect the trait in a heterozygote.
B
It means the allele is more common in the population.
C
It means the allele is biologically stronger or better.
D
It means the allele is inherited by more offspring.