Question;1;of 30;Light microscopes;can generally magnify objects about 10,000 times without blurring.;typically provide more resolution than an electron microscope.;work by reflecting electrons off the surface of an object being studied.;use light and glass lenses to magnify an image.;All of the choices are correct.;Question;2;of 30;A;scanning electron microscope is used to study __________, whereas a;transmission electron microscope is used to study __________.;live cells... dead cells;cell surfaces... internal cell structures;dead cells... live cells;internal cell structures... cell surfaces;plant tissue... animal tissue;Question;3;of 30;Which of the following statements is consistent with the Cell Theory?;All cells originate spontaneously without prior parent cells.;The cell is the basic structural and functional unity of life.;Cells can only function when associated with other like cells.;Many kinds of living things are not made of cells at all.;Cells of living things all contain the same number and kind of interior organelles.;Question;4;of 30;We can characterize the fluid mosaic model of a membrane as ____________ floating in a sea of;lipids, protein;proteins, lipid;phospholipids, carbohydrate;fats, water;glucose, amino acids;Question;5;of 30;Large, round cells can overcome surface area to volume problems by;becoming larger and rounder.;increasing their size by at least twice.;becoming smaller, narrower or flatter.;increasing the amount of cytoplasm within the cell membrane.;Question;6;of 30;As cell size increases, the;volume and surface area decrease.;volume increases faster than the surface area.;surface area increases faster than the volume.;surface area and volume increase at the same rate.;None of the choices are correct.;Question;7;of 30;Cells that lack a membrane-bound nucleus are __________ cells.;plant;animal;prokaryotic;eukaryotic;fungal;Question;8;of 30;The membranous compartmentalization of a cell;divides the cell into two equal-sized halves.;allows different metabolic processes to occur simultaneously.;requires the presence of a cell wall.;requires the presence of a large central vacuole.;is common in prokaryotes and eukaryotes.;Question;9;of 30;If a biologist said that eukaryotic cells get their power from bacteria, they would be referring to;cells that break down bacteria to provide energy for life.;the bacteria in our large intestines that digest food for us.;the mitochondria in our cells that may have originated as endosymbiotic bacteria.;infectious bacteria that make our bodies work harder to fight infections.;Question;10;of 30;Long fibers of DNA and protein are called a;chromatin.;nucleolus.;ribosome.;lysosome.;central vacuole.;Question;11;of 30;Smooth endoplasmic reticulum;stores calcium ions in muscle cells.;is the major site of carbohydrate synthesis in eukaryotic cells.;produces proteins for cell membranes.;produces antibodies.;helps assemble ribosomes for protein synthesis.;Question;12;of 30;Secretory proteins are;produced by ribosomes on the smooth endoplasmic reticulum.;chemically modified in the nucleus.;produced by the cell for internal use.;released from the cell through the plasma membrane.;incorporated into the mitochondrial membrane.;Question;13;of 30;The Golgi apparatus;is composed of stacks of membranous vesicles that are continuous with one another.;stores, modifies, and packages proteins.;strings together amino acids to produce proteins.;forms fats from glycerols and fatty acids.;is the site of carbohydrate breakdown.;Question;14;of 30;Lysosomes;help to digest worn-out or damaged organelles.;recycle materials within the cell.;fuse with food vacuoles to expose nutrients to lysosomal enzymes.;destroy harmful bacteria engulfed by white blood cells.;All of the choices are correct.;Question;15;of 30;Contractile vacuoles;are generally found in protists that inhabit salt water.;help in the excretion of excess salt.;prevent cells from bursting as a result of the influx of excess water.;allow organisms to avoid dehydration by absorbing water from the environment.;All of the choices are correct.;Question;16;of 30;Cilia differ from flagella in that;cilia are composed of microfilaments and flagella are composed of intermediate filaments.;cilia;contain nine microtubule doublets surrounding a central pair of;microtubules, flagella contain only nine microtubule doublets.;the protein filaments of cilia are naked, those of flagella are wrapped in an extension of the cell membrane.;cilia are typically more numerous and shorter than flagella.;cilia;are anchored only in the proteins of the cell membrane, flagella are;anchored in a special structure called the basal body.;Question;17;of 30;Plants with rigid cell walls are unable to do which process?;diffusion;osmosis;active transport;phagoctyosis;Question;18;of 30;Which of the following cell structures is not associated with the breakdown of harmful substances or substances that are no longer needed by the cell?;lysosomes;mitochondria;peroxisomes;vacuoles;All of the choices play a role in these functions.;Question;19;of 30;Small, nonpolar, hydrophobic molecules such as fatty acids;easily pass through a membrane's lipid bilayer.;very slowly diffuse through a membrane's lipid bilayer.;require transport proteins to pass through a membrane's lipid bilayer.;are actively transported across cell membranes.;usually enter the cell via endocytosis.;Question;20;of 30;Membrane phospholipids;have hydrophobic heads that face the center of the membrane and are shielded from water.;have hydrophilic tails that face outward and are exposed to water.;often have "kinks" in their tails caused by the presence of a single rather than a double bond between carbons.;remain fluid because they are tightly packed against one another.;None of the choices are correct.;Question;21;of 30;Which one of the following is not a function of membrane proteins? Membrane proteins;serve as enzymes.;attach the membrane to the cytoskeleton.;provide cellular identification tags.;form junctions between cells.;All of the choices are membrane protein functions.;Question;22;of 30;Diffusion does not require the cell to expend ATP. Therefore, diffusion is considered a type of;exocytosis.;phagocytosis.;passive transport.;active transport.;endocytosis.;Question;23;of 30;If you were to transfer a saltwater, single-celled protist to fresh water, which of the following is likely to happen?;The cell will shrink;Salt will be pumped out of the cell;Enzymes will flow out of the cell;The cell will swell and burst;Question;24;of 30;Osmosis can be defined as;the diffusion of water across a membrane.;the diffusion of nonpolar molecules.;active transport across a membrane.;the diffusion of a solute.;endocytosis across a membrane.;Question;25;of 30;If you were to transfer a freshwater, single-celled protist to saltwater, which of the following is likely to happen?;The cell will shrink.;Salt will be pumped out of the cell.;Enzymes will flow out of the cell.;The cell will swell and burst.;Question;26;of 30;Which of the following statements is true?;Cells placed in an isotonic solution will swell.;Cells placed in a hypotonic solution will swell.;Cells placed in a hypotonic solution will shrink.;Cells placed in a hypotonic solution will remain the same size.;Question;27;of 30;A cell that has neither a net gain nor a net lose of water when it is immersed in a solution is;isotonic to its environment.;hypertonic to its environment.;hypotonic to its environment.;metabolically inactive.;dead.;Question;28;of 30;Active transport;uses ATP as an energy source.;can move solutes up a concentration gradient.;requires the cell to expend energy.;is necessary to allow nerves to function properly.;All of the choices are correct.;Question;29;of 30;The act of a white blood cell engulfing a bacterium is;osmosis.;diffusion.;receptor-mediated endocytosis.;pinocytosis.;phagocytosis.;Question;30;of 30;Phagocytosis is to eating as pinocytosis is to;osmosis.;drinking.;chewing.;hydrolysis.;lysis.
Paper#63223 | Written in 18-Jul-2015Price : $22