1 Thin, threadlike processes within the cytoplasm that function in various kinds of cell movement areA) microfilaments and microtubules B) cilia and flagella C) centrioles D) vesicles 2 The nucleolus is a small, dense body composed mainly ofA) RNA and protein B) DNA C) invaginated cytoplasm D) chromatin 3 Chromatin fibers coil into rod-like structures known asA) ribosomes B) lysosomes C) chromosomes D) DNA 4 Passive mechanisms that transport materials across the cell membrane include all of the following exceptA) diffusion B) filtration C) osmosis D) endocytosis 5 The mechanism in which molecules or ions spread randomly from areas of higher concentration to areas of lower concentration isA) filtration B) osmosis C) exocytosis D) diffusion 6 If cells swell and rupture after being placed in a solution of unknown salt concentration, the solution was __________ to the cells.A) hypertonic B) hypotonic C) isotonic 7 Which of the following substances can diffuse readily through the cell membrane?A) sodium B) carbon dioxide C) glucose D) amino acids 8 Molecules such as glucose that are too large to pass through the membrane pores and are insoluble in lipids enter the cell from higher to lower concentration usingA) active transport B) filtration C) endocytosis D) facilitated diffusion 9 The only substance that moves through the cell membrane during osmosis isA) glucose B) water C) sodium D) oxygen 10 Osmosis is a special case ofA) filtration B) diffusion C) facilitated transport D) pinocytosis 11 Solutions with a higher osmotic pressure than body fluids are calledA) isotonic B) hypertonic C) hypotonic D) hypoosmotic 12 When fluid is forced through a membrane by hydrostatic or blood pressure, the mechanism is calledA) filtration B) facilitated diffusion C) controlled by electrically gated channels D) hormone mediated 13 In the process of exocytosisA) white blood cells remove bacteria from tissue B) fluid is brought into the cell C) substances are released by the cell, using ATP for energy D) receptors determine if a substance will be taken into the cell 14 Active transport requires ATP energy but passive transport does not.A) True B) False 15 The phase of the cell cycle in which cell contents grow and duplicate isA) interphase B) metaphase C) prophase D) telophase 16 Chromosomes first appear duringA) prophase B) metaphase C) anaphase D) telophase 17 Which of the following occurs during telophase?A) the chromosomes line up between the centrioles B) the centrioles move toward opposite ends of the cell C) the chromosomes are pulled toward the centrioles D) chromosomes approach the centrioles and nuclear envelopes form 18 Which of the following series of events of mitosis is in the correct sequence?A) telophase, anaphase, metaphase, prophase B) prophase, telophase, metaphase, anaphase C) anaphase, prophase, metaphase, telophase D) prophase, metaphase, anaphase, telophase 19 The process by which cells develop different characteristics in structure and function is calledA) maturation B) replication C) hybridization D) differentiation 20 Which of the following is not a characteristic of cancer?A) hyperplasia B) differentiation C) metastasis D) invasiveness 21 What is differentiation?A) cells break off from a cell mass and migrate to different parts of the body B) cells specialize, by turning on some genes and turning off others C) cells no longer know how to divide properly D) membranes let some substances in and not others. 22 All of the structures described in the composite cell can be found in every cell regardless of function.A) True B) False 23 The cell membrane is a static structure that separates one cell from another.A) True B) False 24 Peripheral proteins are found only on the outside of the cell membrane and are not found inside the cell.A) True B) False 25 Ions cannot pass directly through the phospholipid bilayer and must use protein “channels” that pass through the cell membrane.A) True B) False 26 Nutrients are received, processed, and used in the cytoplasm of the cell.A) True B) False 27 Flagella are found on the free surfaces of epithelial cells; cilia are longer, more abundant, and move cells within the body.A) True B) False 28 Microtubules are composed of the globular protein tubulin.A) True B) False 29 The cytoplasm is the site of ribosome production.A) True B) False 30 The cell membrane is a selective barrier that controls which substances enter and leave the cell.A) True B) False 31 Diffusion through a membrane will occur whenever a concentration gradient exists.A) True B) False 32 All cells come from lineages of stem cells and progenitor cells.A) True B) False