Erwin Chargaff showed that DNA that has 30% adenine has ________ thymine.
A) 20%
B) 30%
C) 60%
D) 40%
B) 30%
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Copies of recombinant DNA are produced in a genetically engineered organism by ____
a. reverse transcriptase b. exonucleases c. restriction endonucleases d. DNA ligase e. DNA polymerase
An individual with hemophilia generally lacks or has very low numbers of platelets
Indicate whether the statement is true or false
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.
This tissue gives pear flesh a gritty texture and makes seed coats hard:
a. xylem b. collenchyma c. phloem d. sclerenchyma e. parenchyma