Which of the following protein tags allows for affinity chromatography using Ni2+ as the ligand?
A. glutathione-S-transferase (GST)
B. His tag
C. maltose-binding protein
D. ?-galactosidase
E. protein A
B
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Both Giardia lamblia and parvum are resistant to chlorine
Indicate whether this statement is TRUE or FALSE.
Gardasil prevents infection by group B Streptococcus types 6, 11, 16, and 18.
Answer the following statement true (T) or false (F)
Suppose you are a genetic counsellor, and a man and woman come to you with concerns that if they have a child together, it could have hemophilia. Also suppose that the man has an X-linked recessive form of hemophilia, but the woman does NOT, and that genetic tests reveal the woman is NOT a carrier for hemophilia. Which of the following is the best advice you could give them?
a. Each child that they produce will have a 50% chance of having hemophilia. b. None of their offspring should have hemophilia, but each of their female offspring will be carriers for hemophilia. c. Each of their male offspring will have a 50% chance of having hemophilia; and while their female offspring should not have hemophilia, they will each have a 50% chance of being carriers. d. Each of their male offspring will have hemophilia, and each of their female offspring will have a 50% chance of
In a method called patch-clamping, a glass capillary can be converted into a microelectrode that measures the electrical currents across biological membranes. Which of the following is not true about the patch-clamp method?
(a) The glass capillary adheres to a "patch" of membrane through the application of suction. (b) The aperture in the glass capillary used to make a microelectrode is about 1 ?m in diameter. (c) If the experimental conditions are held constant, fluctuations in electrical currents across the patch of membrane are still observed. (d) Single-channel patch-clamp recordings have demonstrated that gated membrane channels will only open and close in response to specific stimuli. Ion Channels and Signaling in Nerve Cells