Which option correctly lists the direction carbon dioxide travels as it leaves the body of a human?
A) alveoli, bronchioles, bronchi, trachea, pharynx, larynx
B) alveoli, bronchi, bronchioles, trachea, larynx, pharynx
C) alveoli, bronchioles, bronchi, trachea, larynx, pharynx
D) alveoli, bronchi, bronchioles, trachea, pharynx, larynx
Answer: C
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Following electrical stimulation of a muscle cell, calcium functions to
A) stimulate the enzymes that produce ATP. B) bind to the protein troponin. C) leak out of the muscle cell to re-establish the membrane potential. D) break down acetylcholine. E) maintain the relaxed state of the muscle.
A primary immune response is the ________
A) production of primary-type antibodies in the first day of exposure to a microorganism B) immune response elicited by the second exposure of lymphocytes to a particular antigen C) immune response elicited by the first exposure of lymphocytes to a particular antigen D) immune response elicited by the first exposure of memory cells to a particular antigen
Fall is coming, with the prospect of frost, so you decide to pick the last tomatoes on the vine even though they are still green. If you wanted to ripen these tomatoes, which method would be most effective?
A) Put the green tomatoes in a paper bag, and keep the top of the bag open. B) Put the green tomatoes in a dark closet, but with a flash of light about every 4 hours. C) Put the green tomatoes in a plastic bag with an overripe apple. D) Store each green tomato in a separate plastic bag and put them in the dark.
Using genetic engineering techniques, you have created a set of proteins that contain two (and only two) conflicting signal sequences that specify different compartments. Predict which signal would win out for the following combinations
Explain your answers. A. Signals for import into the nucleus and import into the ER. B. Signals for export from the nucleus and import into the mitochondria. C. Signals for import into mitochondria and retention in the ER.