The agouti gene, when expressed in mice, makes them obese, ravenous, yellow, and prone to diabetes. The agouti phenotype is dominant. During ovulation an agouti mouse is given a drug that methylates (or shuts off the agouti gene). She is then bred to another mouse and gives birth to a litter of baby mice, none of whom have the agouti phenotype. Which of the following is accurate?
A. An epigenetic change in the mother was passed to her offspring.
B. Her offspring inherited the methylated form of the agouti gene.
C. The agouti gene will be inactivated for the entire lives of her offspring.
D. All of these are correct.
D. All of these are correct.
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A eukaryotic cell
A. does not usually have a nucleus. B. does not have membrane-bounded organelles. C. has membrane-bounded organelles. D. is usually smaller than a prokaryotic cell. E. has a cell wall with peptidoglycan.
In this step in the identification of the colony
that contains a targeted gene, a. bacterial cells are cloned. b. bacterial colonies are transferred. c. bacterial cells are ruptured. d. DNA is lysed. e. cells with the targeted gene are identified.
When the generative cell divides, the daughter cells are sperm cells
____________________ Indicate whether the statement is true or false.
Which of the following infections presents with three stages: a cold stage hallmarked by shivering and a sensation of cold, a hot stage with fever, and a sweating stage?
A) ehrlichiosis B) Lyme disease C) invasive candidiasis D) malaria E) Rocky Mountain spotted fever