Positron emission tomography (PET) utilizes ____ to yield results of a scan
a. x-rays
b. tracers
c. glucose
d. ion
e. photons
ANSWER: b
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Genetic material transferred from parents to offspring is known as the:
A. karyotype. B. genome. C. open reading frame. D. nucleoid. E. mRNA.
The discovery of Tiktaalik roseae was significant for which of the following reasons?
A. It provided evidence that terrestrial vertebrates are descended from fish. B. It provided evidence that birds and dinosaurs are closely related. C. It was the first fossil to be found with soft parts preserved. D. It provided evidence that the continents were once linked together. E. It was the first fossil from which DNA and other macromolecules were successfully extracted.
More than one mode of inheritance can be seen for a single trait. Indicate whether the statement is true or false
In an allopolyploid organism, what is true regarding the fertility of interspecies hybrids?
A) Interspecies hybrids are fertile due to nonhomology of chromosomes. B) Chromosome doubling and nondisjunction in gametocytes can lead to homologous chromosome pairing, disjunction, and fertile hybrids. C) Interspecies hybrids will be fertile so long as there is an even number of chromosomes in the offspring. D) Mitotic nondisjunction results in haploid cells. E) Meiotic nondisjunction produces three haploid gametes and one diploid gamete.