Hfr means high frequency of ________, and these cells are capable of transferring genes from their ________ to other cells
A) transformation / chromosome
B) transduction / plasmids
C) recombination / chromosome
D) transduction / chromosome
Answer: C
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Assuming complete dominance, what is the expected ratio of phenotypes of the offspring following the cross of two heterozygotes?
A. 1:2:1 B. 3:1 C. 1:1 D. 4:1
Antibodies present in mom's milk primarily belong to the _______ class.
A. IgG B. IgM C. IgA D. IgE
Why does red and blue light support the highest rates of photosynthesis?
a. These wavelengths activate ATP synthase. b. These are the only wavelengths reaching Earth from the sun. c. These are the only wavelengths that carotenoids cannot absorb. d. These wavelengths have the highest energy in the visible spectrum. e. These wavelengths are absorbed by chlorophyll more than any other wavelength.
A scientist isolates a mutant of a gated ion channel that transports ions into the cell in the presence of a particular chemical signal. She determines that the mutation causes the channel to remain open even in the absence of any chemical signal. She measures concentrations of the ion on either side of the membrane and finds that the concentration is higher inside the cell than outside at the beginning of the experiment. After an hour, she measures the concentrations again. What do you expect she will find?
A) The concentration of the ion has increased inside the cell after an hour. B) The concentration of ion inside the cell is equal to the concentration outside the cell. C) The concentration of the ion has become higher outside the cell than inside the cell after an hour. D) The concentrations of the ion inside and outside of the cell have remained constant. E) The ions have all diffused into the membrane.