The Ras monomeric G protein has been shown in some cases to be associated with t
ID: 176015 • Letter: T
Question
The Ras monomeric G protein has been shown in some cases to be associated with the development of cancer in some individuals. This is most likely the result of inactivation of Ras. inactivation of the mitogen activated protein kinases. continual activation of Ras. continual activation of mitogen activated protein kinases. both C and D Which of the following processes would be most likely to occur in the Golgi apparatus? synthesis of DNA synthesis of steroids synthesis and packaging of lipids glycosylation of proteins detoxification of drugs When the size of a cell increases, the surface area/volume ratio. remains the same decreases increases initially and then begins to decrease decreases initially and then begins to increase DNA isolated from cow liver cells contains 30% T: what percent will be G? 20% 60% 30% 36% 56% Cyclins modulate the progression of cells through the cell cycle by increasing the production of DNA polymerases. phosphorylating histones. inducing synthesis of constitutively active forms of growth cell receptors. activating protein kinases that are critical regulators of cell division. directly activating G proteins. The is a complex network of interconnected filaments and tubules that extends throughout the cytosol, from nucleus to the inner surface of plasma membrane. cytoskeleton microtubule apparatus cell scaffold desmin sheath microfilament array The primary structure of a protein is important for determining the secondary and tertiary structure of a protein. is simply the order of amino acids from one end of the protein to another. is important structurally. is the linear sequence of amino acids that are linked together by peptide bonds. all of the above Which of the following choices reflects the appropriate order of locations through which a protein destined for the plasma membrane travels? lysosome rightarrow endosome rightarrow plasma membrane ER rightarrow lysosome rightarrow plasma membrane Golgi rightarrow lysosome rightarrow plasma membrane ER rightarrow Golgi rightarrow plasma membrane the correct order is not listedExplanation / Answer
16. The correct answer is : E) both C and D are correct.
Reason:Cancer in some individuals is caused due to continued and permanent activation of Ras that in turn continually activates the MAP kinase cascade of signalling that is associated with continual cell division and growth.
17.The correct answer is: D) Glycosylation of proteins
Reason: Many glycosylation enzymes are present in golgi that attach sugar moeities to the proteins.
18.The correct answer is: C) decreases.
Reason: With increase in cell size the surface area/volume decreases and vice versa.
19.The correct answer is:A)20%
Reason: As per chargaff's rule % A =% T and %G =%C
Since T = 30%, A=30% , G+ C = 100-60 = 40% ,G = 40/2 = 20%, C= 20%
20.The correct answer is :D) activating protein kinases that are critical regulators of cell division.
Reason: Cyclins activate proteins known as cyclin dependent kinases enzymes and these regulate the progression of cell cycle.
21.The correct answer is :A) Cytoskeleton
Reason: The cytoskeleton best describes the above statement and it gives shape to cell.
22.The correct answer is :E) All of the above
Reason: All of the above statements about the primary structure of protein are correct.
23.The correct answer is : D) ER-Golgi-plasma membrane
Reason: Proteins synthesized in rough ER are transported to golgi where they undergo glycosylation and then reach the plasma membrane.
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