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Ch 11 Quiz
1. What happens in the lac operon when lactose is present (1)?
When lactose is present, it binds to the repressor rendering it inactive and allowing the
genes to be expressed, producing enzymes to digest the lactose.
2. Compare and contrast repressors and activators (2).
Repressors cease expression of genes. They block RNA polymerase from binding. When
bound to the operator, there is no gene expression. Activators activate gene expression.
They make it easier for the RNA polymerase to bind. When bound to the operator, there
is gene expression. They are both control gene expression.
3. A homeotic gene (1)
A) turns on the genes necessary for synthesis of proteins.
B) serves as a master control gene that functions during embryonic development by
controlling the developmental fate of groups of cells.
C) represses gene transcription and promotes mRNA translation.
D) produces a product that controls the transcription of other genes.
E) is found only in adult somatic cells.
4. The term "gene expression" refers to the (1)
A) fact that each individual of a species has a unique set of genes.
B) fact that individuals of the same species have different phenotypes.
C) process by which genetic information flows from genes to proteins.
D) fact that certain genes are visible as dark stripes on a chromosome.
E) flow of information from parent to offspring.
5. Explain how nuclear transplantation cloning works (1).
Nuclear transplantation cloning removes the nucleus from an egg cell and inserts a
nucleus with full genome from a donor cell. The egg cell with donor nucleus is grown in
culture and implanted into a surrogate mother to maturity, at which point, the clone
organism is born.
6. A gene that can cause cancer when present in a single copy in a cell is called a(n) (1).
A) oncogene.
B) enhancer gene.
C) silencer gene.
D) carcinogen.
E) proto-oncogene.
7. What are histones and nucleosomes and what purpose do they serve? (1).
Histones are proteins that bind to the DNA to assist with the initial coiling and folding of
the chromosome. Nucleosomes are a complex of 8 nucleosomes and DNA, which enable
the chromosome to be further coiled.
8. How does reverse transcriptase make a single strand of DNA from a mRNA (2)?
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Name ______________________
Ch 11 Quiz
1. Compare and contrast repressors and activators (1).
2. What are histones and nucleosomes and what purpose do they serve? (1).
3. What happens in the lac operon when lactose is present (1)?
4. A gene that can cause cancer when present in a single copy in a cell is called a(n) (1).
A) oncogene.
B) enhancer gene.
C) silencer gene.
D) carcinogen.
E) proto-oncogene.
5. Explain how nuclear transplantation cloning works (1).
6. The term "gene expression" refers to the (1)
A) fact that each individual of a species has a unique set of genes.
B) fact that individuals of the same species have different phenotypes.
C) process by which genetic information flows from genes to proteins.
D) fact that certain genes are visible as dark stripes on a chromosome.
E) flow of information from parent to offspring.
7. How does reverse transcriptase make a single strand of DNA from a mRNA (2)?
8. A homeotic gene (1)
A) turns on the genes necessary for synthesis of proteins.
B) serves as a master control gene that functions during embryonic development by
controlling the developmental fate of groups of cells.
C) represses gene transcription and promotes mRNA translation.
D) produces a product that controls the transcription of other genes.
E) is found only in adult somatic cells.