An average hemodialysis session usually lasts 4 hours and occurs about
A) three times a week.
B) 7 days a week.
C) once a week.
D) once a month.
E) three times a month.
A
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CD4 molecules are found on T ________ cells, whereas CD8 molecules are characteristic of T________ cells.
Fill in the blank(s) with the appropriate word(s).
A strong stimulus will cause the neuron to generate a larger action potential than does a weaker
stimulus. ____________________ Indicate whether the statement is true or false.
Erwin Chargaff discovered that DNA contains equal numbers of adenine and thymine bases and equal numbers of cytosine and guanine bases. Which hypothesis would this have most likely led to?
A.) DNA might be in the form of a helix. B.) There might be some kind of symmetry in the DNA molecule. C.) DNA is not the only molecule involved in the passing on of hereditary traits. D.) Guanine and cytosine have very different structures than adenine and thymine.
Recombinant DNA is any DNA that ____.
A. has been cut by restriction enzymes B. is at least four to eight base pairs in length C. has had its gene sequence rearranged D. consists of DNA from two or more organisms of the same or different species E. inserted into plasmids