Which of the following events occurs during prophase I?
a. one full set of chromosomes arrives at each spindle pole
b. crossing over
c. spindle microtubules connect chromosomes to spindle poles
d. separation of sister chromatids
b
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DNA methylation usually activates gene expression
Indicate whether the statement is true or false
Which of the following statements about the mouse is FALSE?
a. Its scientific name is Mus musculus. b. Females give birth to offspring about three weeks after mating. c. It has been used to disprove the "inheritance of acquired characters" hypothesis. d. Knockout mice are those that carry a lethal allele. e. Knockout mice are those that have a gene that is completely nonfunctional.
Human tapeworm infections occur by
A. ingesting eggs in contaminated water. B. eating insufficiently cooked infected pork or beef. C. eating freshly peeled fruit. D. being bitten by a mosquito. E. All of the choices are correct.
You have isolated a cell which contains murein. What other structure(s) can you safely assume this cell has?
A. a cell membrane B. all of the above C. a plasmid D. a pili E. a mitochondrion