Sample Questions– Exam 4 solved test updated solution 2020

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Sample Questions– Exam 4 solved test updated solution 2020 1) Which of the following about membrane phospholipids is NOT true? a) They associate to form bilayers b) They have hydropho... bic tails c) They have hydrophilic heads d) They give the membrane fluidity e) They readily flip-flop from one side of the membrane to the other 2) The main difference between a cell that responds to a signal and the one that does not is the presence of a a. DNA sequence that binds to the signal b. nearby blood vessel c. receptor d. second messenger e. transduction 3) The signals that bind to receptors of the same cell that made them are known as a. paracrine signals. b. juxtacrine signals. c. autocrine signals d. responders. e. hormones. 4) The general name for an enzyme that transfers phosphate groups from ATP to a protein is a. GTPase. b. phosphatase. c. protein kinase. d. phosphodiesterase. e. protease 5) Which of the following is NOT a membrane receptor? a. Ion channel receptor. b. Insulin receptor c. Cortisol receptor. d. G protein-linked receptor 6) Which of the following is NOT a second messenger? a. Calcium ion. b. Inositol trisphosphate. c. Diacylglycerol. d. ATP. e. Cyclic AMP. 7) Plasmodesmata are most similar in function to which of the following structures in animal cells? a) Desmosomes b) Extracellular matrix c) Gap junctions d) Tight junctions 8) Biological membranes are composed of a. nucleotides. b. enzymes only c. fatty acids. d. monosaccharides. e. lipids, proteins, and carbohydrates 9) Which of the following includes all the others? a) Osmosis b) Diffusion of a solute across a membrane c) Facilitated diffusion d) Passive transport 10) An artificial cell consisting of an aqueous solution enclosed in a selectively permeable membrane is immersed in a beaker containing a different solution. Initially, the solution outside the cell is____ to the cell a) Hypotonic b) Hypertonic c) isotonic 11) A deer smells a predator as it passes by and quickly bounds to safety. Which of the following represents the correct order of steps in the olfactory signal transduction pathway that is involved? a. Receptor binds signal, conformational change occurs in signal, signal travels to target cell, signal is transduced within the cell, effects from the signal transduction occur b. Signal travels to target cell, receptor binds signal, conformational change occurs in receptor, signal is transduced within the cell, effects from the signal transduction occur c. Signal travels to target cell, conformational change occurs in signal, signal is transduced within the cell, effects from the signal transduction occur d. Signal is transduced within the cell, signal causes conformational change in receptor, cell responds to the signal, effects from the signal transduction occur e. Cell responds to the signal, signal travels to target cell, signal is transduced within the cell, effects from the signal transduction occur 12) __________ is an enzyme that converts ATP to cAMP? a. Adenylyl cyclase b. Guanylyl cyclase c. Phosphodiesterase d. Phospholipase C e. Diacylglycerol 13) Viagra, used to treat erectile dysfunction, acts by inhibiting ________ a. phosphodiesterase. b. GTPase. c. nitric oxide. d. Guanylyl cyclase. e. acetylcholine. 14) Which of the following statements about the cell cycle is FALSE? a. It consists of interphase, mitosis, and cytokinesis b. The cell’s DNA replicates during the G1 phase c. A cell can remain in the G1 for weeks or much longer. d. DNA is not replicated during the G2 phase. e. Cells enter the cell cycle as a result of internal and external signals. 15) You view an animal cell through a microscope and observe dense, duplicated chromosomes scattered throughout the cell. Which state of mitosis are you looking at? a. Interphase b. Prophase c. Metaphase d. Anaphase e. Telophase 16) ______is the region on a duplicated chromosome that holds the sister chromatids together? a) A microtubule. b) A centriole. c) A centromere. d) A spindle. e) A centrosome. 17) Nucleosomes a) are made of chromosomes b) consist entirely of DNA c) consist of DNA wound around a histone core d) are present only during prophase 18) What type of cell is shown below? a) An animal cell in metaphase b) An animal cell in telophase c) An animal cell undergoing cytokinesis d) A plant cell in metaphase e) A plant cell undergoing cytokinesis 19) A researcher treats cells with a chemical that prevents DNA synthesis from starting. This treatment would trap the cells in which part of the cell cycle? a) G1 b) S c) G2 d) Mitotic phase 20) The restriction point is a. the G2 phase b. prophase c. the G1-to-S transition d. the M phase e. the S phase 21) Knowledge of the cell cycle has led to improved means of treating cancer. The drug 5-fluorouracil blocks the synthesis of thymine. This drugs inhibits the cell cycle at the end of a. G1. b. G2. c. S. d. Mitosis. 22) Which of the following phases of the cell cycle is NOT part of interphase? a. S b. G0 c. G1 d. G2 e. M 23) A cell containing 92 chromatids at metaphase of mitosis would, at its completion, produce two nuclei each containing how many chromosomes? a. 12 b. 16 c 23 d. 46 e. 92 [Show More]

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