A sequence of nucleotides that codes for a single protein is known as a ________
ID: 8478 • Letter: A
Question
A sequence of nucleotides that codes for a single protein is known as a __________.Chromosome
Gene
Codon
Genome
Question 2 (1 point)Save Question 2Save
Which is INCORRECT regarding ligand:protein binding reactions?
Allosteric modulation of the protein's functional binding site occurs directly at the functional binding site itself
Allosteric modulation can alter the affinity of the protein for the ligand
Phosphorylation of the protein is an example of covalent modulation.
If two ligands can each bind to the binding site of the protein (not at the same time), competition for the binding site will occur
Question 3 (1 point)Save Question 3Save
Which of the following is NOT characteristic of intracellular receptors?
They are located on the extracellular surface of the cell membrane.
They interact with lipid-soluble messengers.
They typically alter gene transcription.
All of the above are characteristic of intracellular receptors.
Question 4 (1 point)Save Question 4Save
Receptor X responds to messenger A. Extended exposure of X to very high concentrations of A can lead to a decrease in the # of X, thus reducing the sensitivity to A. This is an example of _________?
Cooperativity
Competitive Antagonism
Down-regulation
Up-regulation
Question 5 (1 point)Save Question 5Save
During Gq/11 signaling, phospholipase C is activated by the alpha subunit of the G-protein, leading to what?
Inositol triphosphate fomration.
Diacylglycerol formation.
Increase in intracellular Ca2+ concentration.
Activation of Protein Kinase C.
All of the above.
Question 6 (1 point)Save Question 6Save
Which of the following will inhibit a forward-progressing chemical reaction?
A low activation energy
A large concentration of reactants.
Presence of a catalyst.
A large concentration of product.
Question 7 (1 point)Save Question 7Save
Which of the following is NOT true regarding glycolysis?
It occurs in the mitochondria.
It does not require oxygen.
Glycolytic breakdown of 1 molecule of glucose to 2 molecules of pyruvate results in a net yield of 2 ATP
Pyruvate, the product of glycolysis, will enter the Kreb's cycle of oxygen is present, or will be converted to lactate in the absence of oxygen.
Question 8 (1 point)Save Question 8Save
The final electron acceptor in oxidative phosphorylation is _______?
Water
Carbon dioxide
Oxygen
NADH
Question 9 (1 point)Save Question 9Save
Which of the following is an example of a mediated-transport system?
Active transport
Facilitated diffusion
Ion channels
Simple diffusion
More than one of the above.
Question 10 (1 point)Save Question 10Save
Movement of an ion through a channel in the cell membrane will be dependent upon all of the following EXCEPT _____?
Concentration gradient of the ion across the cell-membrane.
Electrical gradient across the cell membrane.
State of the ion channel (opened or closed).
Degree of saturation of the binding site between the channels and the ions.
Explanation / Answer
1.A sequence of nucleotides that codes for a single protein is known as a codon.
2.Which is INCORRECT regarding ligand:protein binding reactions?-----If two ligands can each bind to the binding site of the protein (not at the same time), competition for the binding site will occur
3.Which of the following is NOT characteristic of intracellular receptors?----They are located on the extracellular surface of the cell membrane.
4.Receptor X responds to messenger A. Extended exposure of X to very high concentrations of A can lead to a decrease in the # of X, thus reducing the sensitivity to A. This is an example of _________?-----------------Down-regulation
5.During Gq/11 signaling, phospholipase C is activated by the alpha subunit of the G-protein, leading to what?-------------All of the above.
6.Which of the following will inhibit a forward-progressing chemical reaction?------A large concentration of product.
7.Which of the following is NOT true regarding glycolysis?--------------It occurs in the mitochondria.
8.The final electron acceptor in oxidative phosphorylation is _______?--------Oxygen
9.Which of the following is an example of a mediated-transport system?-----------Active transport
10.Movement of an ion through a channel in the cell membrane will be dependent upon all of the following EXCEPT _____?------------------Degree of saturation of the binding site between the channels and the ions
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