QUESTION 29 The major characteristic of amino acids in positions a, d, a' or d' in coiled coils is that they are word/adjective) (one

Question 34 The following are events in the transmission of a signal at a chemical synapse. 1. Neurotransmitter binds with receptors associated with the postsynaptic membrane. Calcium ions rush into neuron's cytoplasm. 2. An action potential depolarizes the membrane of the presynaptic axon terminal. 3. The ligand-gated ion channels open. 4. The synaptic vesicles release neurotransmitter into the synaptic cleft. Which sequence of events is correct? O 3 2-5-1-4 0 1 2 3 4 5 O 3 2 5 4 1 04-3 1-2-5 Question 35 1 pts 1 pts

Question 36 Most eukaryotic RNA consists of coding regions, called and noncoding regions, called A introns; codons B introns; exons (c) codons; spliceons (D exons; introns

QUESTION NO. 1 Cystic fibrosis is a frequent generic disease of Caucasians. The CF gene codes for a protein called the cystic fibrosis transmembrane conductance regulator (CFTR) which functions as a cAMP-regulated chloride channel. The protein has two membrane-spanning domains, two domains that interact with ATP, and one regulatory domain. The most common defect is in the gene for one of the ATP binding domains. The result is a protein that does not fold correctly in the endoplasmic reticulum, is not properly glycosylated, and is nor transported to the cell surface. Rather, it is degraded in the cytosol within proteasomes. Drugs that foster chaperone interaction with the mutant protein are a potential therapeutic approach. Chaperones  A. are always required to direct the folding of proteins. B. when bound to protein increase the rate of protein degradation. C. usually bind to strongly hydrophilic regions of unfolded proteins. D. sometimes maintain proteins in an…

QUESTION 18 Which cell type is the most metabolically active among the following: TABLE 3.1 Composition of Selected Membranes Membrane Protein Lipid Carbohydrate Red blood cell membrane 49% 43% 8% Myelin membrane around nerve cells 18% 79% 3% Inner mitochondrial membrane 76% 24% 0% Myelin surrounding nerve cells These membranes are metabolically equal Inner mitochondrial membrane Red blood cell

QUESTION 20 You are studying the effects of removing integrins from cells. Which of the following abilities is the cell most likely to lose?   A The cells are going to lose their ability to make connections with the ECM.   B The cells will lose their ability to secrete growth factors.   C The cells are going to lose their ability to form cell-cell adhesions.   D The cells are going to lose their ability to communicate with the cytoskeleton.

question 24  DNA is a hereditary molecular that is composed of A Deoxyribose,phosphate, and nitrogen bases B Deoxyribose,a pentose, and nucleic acids C Sugar,proteins and thymine D Adenine, phosphate, and ribose

Question 24 The glucose transporter in erythrocytes is named GLUT1. The transport system is an example of A symporters ion channels OB. active transport OC. facilitated diffusion

QUESTION 13 Two chambers, X and Y, are separated by a semi-permeable membrane that allows water and urea, but not glucose, to pass through. At the start, chamber X contains a solution of urea in wate and chamber Y contains a solution of glucose in water. The molarity (measure of concentration) of urea in chamber X is the same number as the molarity of glucose in chamber Y. Which of the following will occur after sufficient time? There will be overall diffusion of water from Y to X. There will be no overall diffusion of water across the membrane. There will be overall diffusion of water from X to Y.

Question 14 ZORANG PENYATA G O a polar head and tail TANAMAN A phospholipid molecule is best described as: O a polar head and nonpolar tail a nonpolar head and tail ****** an adenine with three phosphates