Which of the following is an example of post-transcriptional control of gene expression?
A) the addition of methyl groups to cytosine bases of DNA
B) the binding of transcription factors to a promoter
C) the removal of introns and alternative splicing of exons
D) gene amplification contributing to cancer
E) the folding of DNA to form heterochromatin
Answer: C
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In a certain breed of chicken, two genes control color. A dominant allele (I) inhibits the expression of any color gene
(C). The recessive allele (c) results in albinism when homozygous (cc). Give the F2 phenotypic ratio of a cross between a colored chicken (ii CC) with a white chicken (II cc). What will be an ideal response?
Which one of the following is TRUE regarding electrons, shells, and energy?
A) Electrons are located in shells around the nucleus. B) Electrons are attracted to each other because they have the same charge. C) In order for an electron to move closer to the nucleus, it must absorb energy. D) The innermost electron shell has the most potential energy. E) As an electron moves to a shell further from the nucleus, it loses energy.
Amniocentesis is _____.
A. a surgical means of repairing deformities B. a form of chemotherapy that modifies or inhibits gene expression or the function of gene products C. used in prenatal diagnosis to detect chromosomal mutations and metabolic disorders in embryos D. a form of gene replacement therapy E. commonly performed on newborns
Which of the following best describes the main structural components of a virus?
a) nucleic acid and enzymes b) prophage and nucleic acid c) nucleic acid and protein capsid d) protein capsid and enzymes e) prophage and protein capsid