Nuclear pores have proteins that open and close, controlling flow of cell solutions and molecules in and out of the nuclear envelope (a double-thick membrane). In this, nuclear pores are similar in structure and function to
A. gap junctions.
B. cilia.
C. cytoskeleton microtubules.
D. anchoring junctions.
E. vacuoles.
A. gap junctions.
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Imagine that a woman is in the final week of her pregnancy. Her doctor gives her an injection of oxytocin. The likely result of this is that the pregnant woman would _____
A) undergo the loss of oxytocin receptors from her uterine smooth muscle cells B) stop secreting prostaglandins from the placenta C) undergo vigorous contractions of her uterine muscles D) increase the synthesis and secretion of progesterone E) be prevented from lactation
In metabolic processes that generate energy from six-carbon sugars like glucose, a molecule called NAD is often attached to an enzyme carrying out one of the metabolic reactions
Which one of the following folding domains is most likely to be found in the region of one of these enzymes where association with NAD occurs? A. Rossman folds B. TIM barrels C. beta barrels D. globin folds E. Rossman folds, TIM barrels, beta barrels and globin folds are all equally likely to be found in a metabolic enzyme in the region of attachment to NAd.
Which soil region is the top layer of surface litter, such as twigs and leaves?
a. A horizon b. B horizon c. C horizon d. D horizon e. O horizon
Which of the following is the least common ecosystem on Earth?
a. Freshwater b. Terrestrial c. Shallow ocean d. Deep ocean bottom