The only means by which an extracellular chemical messenger can bring about a de
ID: 204300 • Letter: T
Question
The only means by which an extracellular chemical messenger can bring about a desired intracellular response is by binding an intracellular receptor
True
False
A solution of lower solute concentration has a highe concentration of water, therefore, it has a lower osmotic pressure than does a solution with a higher solute concentration
True
False
Paracrines
a. are long-range chemical mediators that are specifically secreted into the blood by endocrine glands and are carried to distant target organs.
b. are hormones released into the blood specifically by neurosecretory neurons.
c. are hormones released specifically from the parathyroid glands.
d. are local chemical mediators whose effect is exerted only on neighboring cells in the immediate environment of their site of secretion.
e. are very short-range chemical mediators released by neurons in response to action potentials.
Which process occurs during post-transcriptional modification of mRNA
a.Addition of a GTP cap
b.Introns are cut out and removed
c.Addition of a poly-A tail
d.All of the above
Explanation / Answer
1. The only means by which an extracellular chemical messenger can bring about a desired intracellular response is by binding an intracellular receptor
Answer : False
Explanation : There are three ways by which an extracellular chemical messenger can bring about a desired intracellular response
2. A solution of lower solute concentration has a high concentration of water, therefore, it has a lower osmotic pressure than does a solution with a higher solute concentration
Answer : True
Explanation : Lower solute concentration result in lower osmotic pressure and higher solute concentration result in higher osmotic pressure. The solutes insert pressure on the walls, which increase with increasing solute concentration
3. Paracrines
Answer : are local chemical mediators whose effect is exerted only on neighboring cells in the immediate environment of their site of secretion.
Explanation : The paracrine signalling is cell to cell communication and it will affect only the neighbouring cells.
4.
Which process occurs during post-transcriptional modification of mRNA
a.Addition of a GTP cap
b.Introns are cut out and removed
c.Addition of a poly-A tail
d.All of the above
Answer : All the above
Explanation : The Post transcriptional modification involves three main process
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