Bio

69 cards   |   Total Attempts: 182
  

Cards In This Set

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Using the yeast signal transduction pathways, both types of mating cells release the mating factors. These factors bind to specific receptors on the correct cells,
Which induce changes in the cells that lead to cell fusion.
What is most likely to happen to an animal's target cells that lack receptors for local regulators?
They might not be able to multiply in response to growth factors from nearby cells.
Which of the following is a likely explanation of why natural selection favored the evolution of signals for sexual reproduction?
Even in the simplest organisms, sexual reproduction required several coordinated responses by cells.
Which of the following is characterized by a cell releasing a signal molecule into the environment, followed by a number of cells in the immediate vicinity responding?
Paracrine signaling
In the formation of biofilms, such as those forming on unbrushed teeth, cell signaling serves which function?
Aggregation of bacteria that can cause cavities
In yeast signal transduction, the yeast cells
Secrete molecules that result in response by other yeast cells.
In which of the following ways do plant hormones differ from hormones in animals?
Plant hormones may travel in air or through vascular systems.
In an experiment to track the movement of growth factor molecules from secretion to the point of receptor binding in a particular species of mammal, a student found a 20-fold reduction in mm traveled when in the presence of an adrenal hormone. This is in part attributable to which of the following?
The growth factor is a paracrine signal.
When a neuron responds to a particular neurotransmitter by opening gated ion channels, the neurotransmitter is serving as which part of the signal pathway?
Signal molecule
Of the following, a receptor protein in a membrane that recognizes a chemical signal is most similar to
The active site of an allosteric enzyme that binds to a specific substrate.
Which of the following is true for the signaling system in an animal cell that lacks the ability to produce GTP?
It would not be able to activate and inactivate the G protein on the cytoplasmic side of the plasma membrane.
Testosterone functions inside a cell by
Binding with a receptor protein that enters the nucleus and activates specific genes.
Which of the following is true of transcription factors?
They control gene expression.
One of the major categories of receptors in the plasma membrane reacts by forming dimers, adding phosphate groups, and then activating relay proteins. Which type does this?
Receptor tyrosine kinases
Because most receptors are membrane proteins, which of the following is usually true?
They change their conformation after binding with signal polypeptides.