30. Enzymes that move certain phospholipids between leaflets have also which of the following properties? A) Play a role in establishing and maintaining membrane lipid asymmetry B) Interacts with neighboring epithelial cells, or the basal membrane C) Blocks post-synaptic membrane D) Transport proteins E) All of these are correct 31. You have fused a mouse cell and a human cell and then treated the cell with specific antibodies that are covalently linked to fluorescent dyes (antibodies to mouse proteins – green; antibodies to human proteins – red). What does the cell look like immediately after fusion? A) The cell is half red and half green. B) The red and green labels are uniformly distributed across the entire membrane. C) The red and green labels are distributed in intermingled patches. D) The cell appears to be yellow in color. E) The cell appears to be brown in color. 32. The two chains of the DNA double helix are held together by _____. A) hydrophobic interactions B) hydrophilic interactions C) van der Waals interactions D) H bonds E) peptide bonds 33. Which of the following is a tenet of the Cell Theory? 1) All organisms are composed of one or more cells. 2) The cell is the structural unit of life. 3) Cells can arise only by division from a preexisting cell. 4) Cells divide only by fission. A) 1 B) 2 C) 3 D) 4 E) 1, 2 and 3 34. The process of photosynthesis converts a photon of light into a glucose molecule. This is an example of the ___ Law of Thermodynamics. Oxidation of a glucose molecule releases heat into the environment. This is an example of the ___ Law of Thermodynamics. A) First, Second B) Second, First C) First, First D) Second, Second
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Enzymes that move certain phospholipids between leaflets have also which of the following properties? Answer: **A) Play role establishing maintaining membrane lipid asymmetry** Show more…
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Which of these is most abundant in the plasma membrane? A) proteins B) carbohydrates C) cholesterol D) phospholipids If a liver cell were to be placed in a beaker with a solution containing the same solute concentration as that found inside the cell, we would say that the beaker contained a(n) solution. A) heterotonic B) hypertonic C) isotonic D) hypotonic You have a bacterial infection. Your immune system will be able to distinguish this foreign invader from other cells by A) recognizing cell adhesion molecules (CAMs) B) finding glycolipids on the plasma membrane C) identifying glycoproteins on the plasma membrane D) determining the presence or absence of a nucleus When bacteria appear in tissues, a type of large cell engulfs and destroys them. Which process are these cells using to engulf the bacteria? A) exocytosis B) active transport C) pinocytosis D) phagocytosis Which of the following is a membranous organelle that chemically modifies and ships proteins to other organelles or out of the cell? A) lysosome B) chloroplast C) mitochondria D) Golgi complex Most of the energy used by the cell is converted to ATP in . A) lysosomes B) Golgi complexes C) nuclei D) mitochondria
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40. Identify the incorrect description about the plasma membrane structure: a. Surface proteins are used to identify cells (ex. blood typing.) b. Transmembrane (Integral) proteins add strength and flexibility to the membrane. c. Phospholipids form a bilayer, with the nonpolar tails facing each other and the polar heads facing the cytosol and extracellular fluid. d. Surface proteins act as receptors to recognize and bond with hormones. e. Phospholipids are the most abundant molecule in the plasma membrane 41. Identify the correct statement describing transport across the plasma membrane: a. Passive transport uses ATP to move material from lesser to greater concentration. b. Simple diffusion, facilitated diffusion and osmosis are all examples of active transport mechanisms c. Active transport mechanisms move substances from greater to lesser concentration. d. Ions and small polar molecules like water, glucose, and amino acids use proteins for transport across the plasma membrane by facilitated diffusion e. Nonpolar molecules like Steroids, lipids, O2 and CO2 use cholesterol for transport across the plasma membrane by simple diffusion 42. Identify the incorrect statement describing transport across the plasma membrane: a. Active transport uses ATP to move substances from areas of lesser to greater concentrations. b. Ions and small polar molecules like water, glucose, and amino acids use proteins for transport across the plasma membrane by facilitated diffusion. c. Nonpolar molecules like Steroids, lipids, O2 and CO2 use the phospholipid bilayer for transport by facilitated diffusion. d. Passive transport mechanisms move substances from greater to lesser concentration. e. Passive transport mechanisms include simple diffusion, osmosis and facilitated diffusion
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25.) In eukaryotes, fatty acids are stored as triglycerides in cells that have: A) Golgi that store glucose, B) too little ATP, C) lysosomes that make glycogen, D) liposomes that contain an enzyme that performs dehydration synthesis to form triglycerides, E) mRNA that makes amino acids into fat. 26.) The sequence of nucleotides found in mRNA is determined by the: a) structure of DNA polymerase, b) sequence of amino acids in a protein, c) large complex proteins, d) sequence of nucleotides in a gene in the DNA, e) fatty acids and glycerol in the cell. 27.) Which is NOT a characteristic of mitochondria? They: A) have two membranes. B) are the site of cellular aerobic respiration. C) have a true nucleus. D) contain their own DNA and ribosomes. E) the material inside their inner membrane (the cellular matrix) is their own cytoplasm. 28.) The space between the endoderm and the ectoderm is important in the evolution of protostomes and deuterostomes because it provides: a) a stable internal, fluid environment inside that is different from the outside environment. b) homeostatic regulation of molecules and ions that pass into and out of the cells, c) provides an environment for communication between different cells and tissues. d) Maintains homeostasis for adjacent cells. e) All are true. 29.) Many eukaryote cells are not able to synthesize (make their own) the amino acids that they require for life functions. When such a cell is placed in an aqueous (water) solution containing the 20 essential amino acids, one would expect that: a) nothing would happen. b) amino acids would be moved into the cell by specific membrane transport proteins. c) H2O would dissolve in the membrane. d) the cell would make Glucose into amino acids. e) the cell would divide. 30.) The Beta cell of the pancreas, an example of a eukaryotic cell, produces a protein called Insulin. You would expect that such cell products are secreted from the cell during which of the following stages of the Cell Cycle: a) Meiosis, b) Gap (G1) Growth 1, c) Synthesis, d) Gap 2 (G2) Growth 2, e) none of these are correct.
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