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WorksheetsBIOL 1407: Chp. 21 - Genomes and Their Evolution Quiz
Total questions: 15
Worksheet time: 8mins
Approximately how much of the human genome codes for proteins?
98.5%
44%
20%
1.5%
What are pseudogenes?
Genes that code for rRNA
Genes that regulate other genes
Nonfunctional former genes with mutations
Functional genes that code for proteins
Which of the following statements correctly describes one characteristic of retrotransposons?
They contribute a significant portion of the genetic variability seen within a population.
They use an RNA molecule as an intermediate in transposition.
They are found only in animal cells.
They generally move by a cut-and-paste mechanism.
Which of the following can be duplicated in a genome?
Only entire sets of chromosomes
DNA sequences, chromosomes, or sets of chromosomes
Only entire chromosomes
Only DNA sequences
How are transposons different from retrotransposons?
Transposons use an RNA intermediate.
Retrotransposons use a DNA intermediate.
Transposons move by a cut-and-paste mechanism.
Retrotransposons are found only in prokaryotes.
What is the role of Alu elements in the genome?
They are responsible for cell division.
They help regulate gene expression.
They are involved in DNA replication.
They code for proteins.
Which of the following statements correctly describes one characteristic of a multigene family?
A multigene family includes multiple genes whose products must be coordinately expressed.
A multigene family includes genes whose sequences are very similar and that probably arose by duplication.
A multigene family includes a gene whose exons can be spliced in a number of different ways.
A multigene family includes a highly conserved gene found in a number of different species.
Why is sequencing of eukaryotic genomes more difficult than sequencing genomes of bacteria or archaea?
There is a high proportion of G-C base pairs in eukaryotic DNA, which makes sequencing difficult to complete.
It is due to the large size of eukaryotic proteins.
Eukaryotic genomes contain sequences for hard-to-find proteins.
The large size of eukaryotic genomes and the large amount of eukaryotic repetitive DNA make sequencing difficult.
What is a short tandem repeat (STR)?
A type of transposable element
A long sequence of non-repetitive DNA
A single nucleotide polymorphism
A series of repeating units of 2 to 5 nucleotides
What is the function of lysozyme?
It plays a role in milk production in mammals.
It regulates gene expression.
It helps protect animals against bacterial infection.
It is involved in DNA replication.
What is the significance of sequence conservation in noncoding DNA?
It shows that these regions are unique to humans.
It implies that these regions are involved in protein synthesis.
It suggests that these regions have important functions.
It indicates that these regions have no function.
What is the result of unequal crossing over during prophase I of meiosis?
It results in the loss of entire chromosomes.
It results in the formation of new alleles.
It results in one chromosome with a deletion and another with a duplication.
It results in two identical chromosomes.
What is the role of transposable elements in genome evolution?
They always cause harmful mutations.
They can provide sites for crossover between nonsister chromatids.
They are only found in prokaryotic genomes.
They do not affect gene expression.
What is polyploidy?
A condition where an organism has multiple sets of chromosomes
A condition where an organism has only one set of chromosomes
A condition where an organism has a single chromosome
A condition where an organism has no chromosomes
What is exon shuffling?
The duplication of exons within a single gene
The mixing and matching of exons within a gene or between two nonallelic genes
The process of removing exons from a gene
The deletion of exons from a gene
