7. Which letter in the diagram below indicates the structure that is most closely associated with excretion?

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1 1. Which sequence of terms is in the correct order from simplest to most complex? 1) cells tissues organs organ systems 2) tissues organisms cells organ systems 3) cells tissues organ systems organs 4) organs organisms organ systems cells 2. The invention of the compound light microscope enabled scientists to observe cells, helping them to 1) determine the number of atoms in a molecule 2) discover a basic similarity among organisms 3) study the behavior of chordates 4) develop techniques for growing plants in a laboratory 3. Which letter indicates a cell structure that directly controls the movement of molecules into and out of the cell? 7. Which letter in the diagram below indicates the structure that is most closely associated with excretion? 1) A 2) B 3) C 4) D 8. A structure that performs a specialized function within a cell is known as 1) a tissue 2) an organelle 3) an organ 4) a system 9. Base your answer to the following question on the diagram below which represents the fluid-mosaic model of a cell membrane. 1) Q 2) R 3) S 4) T 4. In a cell, all organelles work together to carry out 1) diffusion 2) active transport 3) information storage 4) metabolic processes 5. Which cell organelle is most directly involved with the bonding of amino acids? 1) mitochondrion 2) endoplasmic reticulum 3) cell wall 4) ribosome 6. One difference between plant and animal cells is that animal cells do not have 1) a nucleus 2) chloroplasts 3) a cell membrane 4) centrioles The arrow points to a component of the membrane that is best described as a 1) sugar floating in lipids 2) protein floating in lipids 3) lipid floating in proteins 4) lipid floating in sugars 10. Which statement regarding the functioning of the cell membrane of all organisms is not correct? 1) The cell membrane forms a boundary that separates the cellular contents from the outside environment. 2) The cell membrane is capable of receiving and recognizing chemical signals. 3) The cell membrane forms a barrier that keeps all substances that might harm the cell from entering the cell. 4) The cell membrane controls the movement of molecules into and out of the cell. Un7 Prev Page 1

2 11. Which structure is most directly responsible for maintaining homeostasis in all cells? 1) chloroplast 2) cell membrane 3) centriole 4) cell wall 12. Base your answer to the following question on In the diagram below, the dark dots indicate small molecules. These molecules are moving out of the cells, as indicated by the arrows. The number of dots inside and outside of the two cells represents the relative concentrations of the molecules inside and outside of the cells. ATP is being used to move the molecules out of the cell by 1) cell A, only 2) cell B, only 3) both cell A and cell B 4) neither cell A nor cell B 13. Base your answer to the following question on The diagram below represents movement of a large molecule across a membrane. Which process is best represented in this diagram? 1) active transport 2) diffusion 3) protein building 4) gene manipulation 14. An environmental change causes the contractile vacuoles of a paramecium to stop functioning, while most of the other cell structures appear to be unaffected. Which environmental change would most likely produce this result? 1) temperature change from 20ºC to 25ºC 2) ph change from 7.0 to 6.5 3) large decrease in the amount of light 4) slight increase in salt concentration in the environment Un7 Prev Page 2

3 15. A cell is represented in the diagram shown below. Which statement about the cell is correct? 1) Structure A synthesizes and secretes cellular products. 2) Structure B contains nucleotides involved in transmitting genetic information. 3) Structure C utilizes carbon dioxide in the process of photosynthesis. 4) Structure D is the site of aerobic respiration. 16. Which organelle is the site of cellular respiration? 1) endoplasmic reticulum 2) mitochondria 3) ribosomes 4) chloroplast function 17. Which organelle is correctly paired with its function? 1) nucleus provides carbohydrates for fermentation 2) chloroplast serves as a site for photosynthesis 3) centriole synthesizes digestive enzymes 4) lysosome packages cellular products 18. Base your answer to the following question on Which process accomplishes the movement of gases illustrated by the arrows in the diagram below? 1) transpiration 2) diffusion 3) phagocytosis 4) osmosis Un7 Prev Page 3

4 Base your answers to questions 19 and 20 on the graph below. The graph shows the relative concentrations of different ions inside and outside of an animal cell. 19. Name the process responsible for maintaining high concentrations of K+ ions inside the cell. 20. Write the symbol of the ion that is closest to equilibrium inside and outside of the cell. Un7 Prev Page 4

5 21. Identify a specific structure in a single-celled organism. State how that structure is involved in the survival of the organism. 22. Just like complex organisms, cells are able to survive by coordinating various activities. Complex organisms have a variety of systems, and cells have a variety of organelles that work together for survival. Describe the roles of two organelles. In your answer be sure to include: a the names of two organelles and the function of each b an explanation of how these two organelles work together c the name of an organelle and the name of a system in the human body that have similar functions 23. Base your answer to the following question on Base your answer to the following question on the diagram below, which shows some of the specialized organelles in a single-celled organism. a Write the letter of one of the labeled organelles and state the name of that organelle. b Explain how the function of the organelle you selected in part a assists in the maintenance of homeostasis. c Identify a system in the human body that performs a function similar to that of the organelle you selected in part a. Un7 Prev Page 5

6 24. Base your answer to the following question on The diagram below represents a cell viewed using a compound light microscope. Select one of the lettered parts from the diagram. Record the letter of the part chosen in the space provided on your answer paper and, using one or more complete sentences, state the function of the part. 25. Base your answer to the following question on A plant cell is represented in the diagram below. Select one of the lettered structures. Record the letter of the structure chosen and, using one or more complete sentences, state the function of the structure. Base your answers to questions 26 and 27 on the two sets of cell organelles in the chart below and on your knowledge of biology. 26. Select one set of organelles and record the letter of the set. Identify a cellular process that is accomplished by organelle 1 in the set you selected. Un7 Prev Page 6

7 27. Explain how the two organelles in the set you selected interact to carry out the cellular process you identified in the previous question. 28. Base your answer to the following question on the diagram below, which represents a unicellular organism in a watery environment. The s represent molecules of a specific substance. Arrow A represents active transport. State two ways that active transport is different from diffusion. Un7 Prev Page 7

8 Base your answers to questions 29 and 30 on the diagram below of sugar in a beaker of water. 29. In lab setup B, structure Z prevents the movement of sugar molecules into side 1. Which part of a living cell serves the same purpose as structure Z? 30. What process accounts for the change shown in lab setup A? Un7 Prev Page 8

9 Un7 Prev Page 9

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