The only means by which an extracellular chemical messenger can bring about a de
ID: 204129 • 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 - It is a FALSE statement.
Extracellular chemical messanger can bring about a desired intracellular response by binding to cell surface receptors as well as intracellular receptors.
2. A solution of lower solute concentration has a higher concentration of water, therefore, it has a lower osmotic pressure than does a solution with a higher solute concentration - TRUE
Presence of high solute concentration gives high osmotic presssure to the solution as compared to solution of low solute concentration.
3. Paracrine - are local chemical mediators whose effect is exerted only on neighboring cells in the immediate environment of their site of secretion.
Paracine secretion affect the cells which are present nearly to secreting cells. Paracrine secretion doesnot go in blood stream.
4. Which process occurs during post-transcriptional modification of mRNA
Option d (All of the above) is correct
During post-transcriptional modification of mRNA, GTP capping, intron removal and addition of poly A tail occurs.
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