BIO 150 Sample Questions – Exam solution docs latest solution

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BIO 150 Sample Questions – Exam solution docs latest solution 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) Simple 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) ______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. 16) 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 17) Through a microscope you see a cell plate beginning to form across the middle of a cell and nuclei reforming on either side of the cell plate. This cell is most likely a) An animal cell in the process of cytokinesis b) A plant cell in the process of cytokinesis. c) An animal cell in the S phase of the cell cycle. d) A bacterial cell dividing e) A plant cell in metaphase 18) The restriction point is a. the G2 phase b. prophase c. the G1-to-S transition d. the M phase e. the S phase 19) Knowledge of the cell cycle has led to improved means of treating cancer. Taxol, which prevents the microtubules of the spindle fiber from functioning normally, prevents the cell cycle from entering a. G1. b. G2. c. S. d. prophase. e. interphase. 20) 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 21) Knowledge of the cell cycle has led to improved means of treating cancer. The drug 5-fluorouracil, which blocks the synthesis of thymine, inhibits the cell cycle during a. G1 phase. b. G2 phase. c. S phase. d. prophase. e. metaphase. Use the figure below to answer question 23 22) The cell labeled _______ shows an animal cell in a hypotonic environment, while the cell labeled ____ shows a plant cell in a hypertonic environment. a. C ,,, B b. D ,,, A c. E … C d. A ,,, E e. B… D 23) Knowledge of the cell cycle has led to improved means of treating cancer. Taxol, which prevents the microtubules of the spindle fiber from functioning normally, prevents the cell cycle from entering a. G1. b. G2. c. S. d. prophase. e. interphase. 24) After observing that fish live in clean water but not in polluted water, researchers state that “polluted water kills fish.” Scientifically, this statement is an example of a(n) a. fact. b. observation. c. opinion. d. theory. e. hypothesis. [Show More]

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