Which of the following is false regarding nondisjunction?
A. Nondisjunction results in sex cells having too few or too many chromosomes.
B. The frequency of nondisjunction increases in women over the age of 37.
C. Nondisjunction is a cause of Down syndrome.
D. A cell with one too few chromosomes is trisomic.
D. A cell with one too few chromosomes is trisomic.
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Hydrolytic enzymes function in the
A) initial degradation of nutrients. B) transport of substrates within the cell. C) chemotactic response, particularly in gram-negative Bacteria. D) regeneration of the periplasm.
Mating an individual expressing a dominant phenotype, but whose genotype is unknown, with an
individual expressing the corresponding recessive phenotype is an example of: a. a heterozygous cross. b. an F1 cross. c. an F2 cross. d. a parental cross. e. a test cross.
In land mammals, the pelvic girdle is the point where the leg bones attach to the rest of the skeleton. Whales also have a small pelvic girdle. What type of evidence for common descent would include the whale's pelvic girdle?
A) a homologous gene B) a homologous structure C) fossil evidence D) a vestigial structure
Why is it important that CO2 be rapidly removed from the cells of animals?
a. because high cellular CO2 affects cellular respiration b. because high cellular CO2 is a narcotic poison c. because CO2 damages nerve function d. because CO2 damages muscle function