When an enzyme has an allosteric activator, it means that
a. a product of the enzyme, or other downstream product, will bind to the enzyme at the
active site and inhibit enzyme activity.
b. a product of the enzyme, or other downstream product, will bind to the enzyme at the
active site and stimulate enzyme activity.
c. a product of the enzyme, or other downstream product, will bind to the enzyme at a site
other than the active site and inhibit enzyme activity.
d. a product of the enzyme, or other downstream product, will bind to the enzyme at a site
other than the active site and stimulate enzyme activity.
e. a product of a different pathway (not a direct or indirect product of the enzyme) will
stimulate the enzyme's activity.
D
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Extracellular molecules activating membrane proteins that in turn activate molecules inside the cell that control differentiation is an example of signal ____
Fill in the blank with the appropriate word.
A microbe is discovered growing near a deep sea thermal vent. When researchers bring a sample up to the surface and try to grow it in a lab at room temperature in a normal incubator, they are unsuccessful. Why?
A. The pressure isn't the same at sea level as it is on the ocean floor. B. Oxygen concentrations are very different between the two environments-it's possible the microbe is a strict anaerobe and is poisoned by the air (oxygen) in the lab. C. Salt concentrations might be different in the media the researchers are attempting to use and the salt water the microbe is used to living in. This might be causing osmotic pressure differences that the microbe can't tolerate. D. The temperature is probably different-the thermal vent would be very hot, while these researchers are trying to grow this microbe at room temperature. The enzymes in the cells are probably outside of their normal operating range at room temperature, and therefore nonfunctional. E. All of the above.
What hormone stimulates the production of cortisol?
A. gonadotropic hormone B. growth hormone C. adrenocorticotropic hormone D. antidiuretic hormone E. thyroid-stimulating hormone
The two forms of starch found in food are
What will be an ideal response?