Homework Answers
18)
The calcium and cAMP are the major secondary messengers for several enzymes. Therefore, the correct option is (D) A&B.
19)
Every integral protein should have a hydrophobic region so that it could integrate into the membrane. Therefore, the correct option is (E).
20)
phosphorylation cascades result in which of the following amplification of singal. Thus, the correct option is (a) only.
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18)which of the following would be considered a second
messenger ?
19)for a protein to be...
Which statement about nitric oxide is true? a. It is a hydrophilic second messenger. b. It...
Which statement about nitric oxide is true? a. It is a hydrophilic second messenger. b. It is a hydrophobic autocrine signal. c. It is a hydrophilic paracrine signal. d. It is a hydrophilic gas. e. It is a hydrophobic second messenger.
The membrane spanning region of an integral membrane protein is primarily composed of which type of...
The membrane spanning region of an integral membrane protein is primarily composed of which type of amino acids? A. non-polar B. polar C. basic D. acidic
6. Lipid-soluble signaling molecules, such as testosterone, cross the plasma membranes of all cells A) by...
6. Lipid-soluble signaling molecules, such as testosterone, cross the plasma membranes of all cells A) by diffusion but affect only target cells because only target cells retain the appropriate DNA segments. B) by diffusion but affect only target cells because only target cells have the intracellular receptors for testosterone. C) through hydrophilic channels of transmembrane proteins but affect only target cells because only target cells retain the appropriate DNA segments. D) through hydrophilic channels of transmembrane proteins but affect only...
Signal amplification is an essential step in signal transduction. Which of the following steps of signal...
Signal amplification is an essential step in signal transduction. Which of the following steps of signal transduction amplify the signal (select all that apply)? Group of answer choices a) ligand binding to receptor b) release of GTP bound form of G protein from receptor c) binding of GTP bound form of G protein to target enzyme d) generation of second messenger by activated target enzyme e) activation of gene expression
What would happen in each of the following cases? Assume in each case that the protein...
What would happen in each of the following cases? Assume in each case that the protein involved is a soluble protein, not a membrane protein. You add a signal sequence (for the ER) to the N-terminal end of a normally cytosolic protein. You change the hydrophobic amino acids in an ER signal sequence into charged amino acids. You change the hydrophobic amino acids in an ER signal sequence into other hydrophobic amino acids. You move the N-terminal ER signal sequence...
Which of these statements about the composition of membranes is true?
Which of these statements about the composition of membranes is true?A) All biological membranes contain cholesterol.B) Free fatty acids are major components of all membranes. C) The inner and outer membranes of mitochondria have different protein compositions.D) The lipid composition of all membranes of eukaryotic cells is essentially the same.E) The lipid: protein ratio varies from about 1: 4 to 4: 1Membrane proteins:A) ere sometimes covalently attached to lipid moieties:B) are sometimes covalently attached to carbohydrate moieties.C) are composed of...
5. List two second messenger systems described in lecture. What kind of messenger system does insulin...
5. List two second messenger systems described in lecture. What kind of messenger system does insulin use? Doen vue Cycase + Prospholipose C 6. What kinds of signal molecules use second messenger systems (lipophilic or lipophobic) and why? 7. A response mechanism that results in the AMPLIFICATION of the initial change (ie uterine contractions during childbirth) is called 8. The path from the sensor to the integrating center is called the pathway, while the path from the integrating center to...
Question 1 1 pts Which of the following is the most common property of membrane lipids?...
Question 1 1 pts Which of the following is the most common property of membrane lipids? O a. They contain two hydrophobic tails. ob. They are sphingolipids. O c. They are amphipathic. O d. They are phospholipids. Question 2 1 pts Which of the following is most likely to contain a region of 20 hydrophobic amino acids? a. A peripheral membrane protein. b. A transmembrane protein. O c. A GPI-anchored protein. O d. A cytosolic protein. Question 3 1 pts...
21: Met c aion of the Polamino 21. Which of the following would NOT Change the...
21: Met c aion of the Polamino 21. Which of the following would NOT Change the structure and function of a protein A Methylation of a protein B. Lipid modification of a protein C. Change in the length of the Poly A tail of the mRNA transcript encoding a protein D. Change in the position of reactive amino acids E. Proteolysis 22. Two peptides have almost the exact same primary structure, except that one has about 10 fewer amino acids...
please help! 39. Albumin is a large protein which circulates freely in human irculates freely in...
please help!
39. Albumin is a large protein which circulates freely in human irculates freely in human plasma. Aquaporins act as a channel for water to enter and exit a cell and are located within the lipid bilayer of the cell membrane Based on their physiological locations, how would the tertiary structure of these two proteins mostly likely compare? A. Albumin has a nonpolar core with a polar outer layer, while aquaporins have a polar core with a norpolar outer...
6. Lipid-soluble signaling molecules, such as testosterone, cross the plasma membranes of all cells A) by diffusion but affect only target cells because only target cells retain the appropriate DNA segments. B) by diffusion but affect only target cells because only target cells have the intracellular receptors for testosterone. C) through hydrophilic channels of transmembrane proteins but affect only target cells because only target cells retain the appropriate DNA segments. D) through hydrophilic channels of transmembrane proteins but affect only...
5. List two second messenger systems described in lecture. What kind of messenger system does insulin use? Doen vue Cycase + Prospholipose C 6. What kinds of signal molecules use second messenger systems (lipophilic or lipophobic) and why? 7. A response mechanism that results in the AMPLIFICATION of the initial change (ie uterine contractions during childbirth) is called 8. The path from the sensor to the integrating center is called the pathway, while the path from the integrating center to...
Question 1 1 pts Which of the following is the most common property of membrane lipids? O a. They contain two hydrophobic tails. ob. They are sphingolipids. O c. They are amphipathic. O d. They are phospholipids. Question 2 1 pts Which of the following is most likely to contain a region of 20 hydrophobic amino acids? a. A peripheral membrane protein. b. A transmembrane protein. O c. A GPI-anchored protein. O d. A cytosolic protein. Question 3 1 pts...
21: Met c aion of the Polamino 21. Which of the following would NOT Change the structure and function of a protein A Methylation of a protein B. Lipid modification of a protein C. Change in the length of the Poly A tail of the mRNA transcript encoding a protein D. Change in the position of reactive amino acids E. Proteolysis 22. Two peptides have almost the exact same primary structure, except that one has about 10 fewer amino acids...
please help!
39. Albumin is a large protein which circulates freely in human irculates freely in human plasma. Aquaporins act as a channel for water to enter and exit a cell and are located within the lipid bilayer of the cell membrane Based on their physiological locations, how would the tertiary structure of these two proteins mostly likely compare? A. Albumin has a nonpolar core with a polar outer layer, while aquaporins have a polar core with a norpolar outer...
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