(d) are made mainly of lipids and of proteins that lie like thin sheets on the membrane surface

Transcription

1 Which of the following statements is no true? Biological membranes (a) are composed partly of amphipathic lipids (b) have hydrophobic and hydrophilic regions (c) are typically in a fluid state (d) are made mainly of lipids and of proteins that lie like thin sheets on the membrane surface (e) function in signal transduction Visit site-

2 Which of the following statements is no true? Biological membranes (a) are composed partly of amphipathic lipids (b) have hydrophobic and hydrophilic regions (c) are typically in a fluid state (d) are made mainly of lipids and of proteins that lie like thin sheets on the membrane surface (e) function in signal transduction ANSWER-D Visit site-

3 According to the fluid mosaic model, membranes consist of (a) a lipid-protein sandwich (b) mainly phospholipids with scattered nucleic acids (c) a fluid phospholipid bilayer in which proteins are embedded (d) a fluid phospholipid bilayer in which carbohydrates are embedded (e) a protein bilayer that behaves as a liquid crystal

4 According to the fluid mosaic model, membranes consist of (a) a lipid-protein sandwich (b) mainly phospholipids with scattered nucleic acids (c) a fluid phospholipid bilayer in which proteins are embedded (d) a fluid phospholipid bilayer in which carbohydrates are embedded (e) a protein bilayer that behaves as a liquid crystal ANSWER-C Visit site-

5 Transmembrane proteins (a) are peripheral proteins (b) are receptor proteins (c) extend completely through the membrane (d) extend along the surface of the membrane (e) are secreted from the cell

6 Transmembrane proteins (a) are peripheral proteins (b) are receptor proteins (c) extend completely through the membrane (d) extend along the surface of the membrane (e) are secreted from the cell ANSWER-C

7 Which of the following statements is NOT part of the cell theory? a. All organisms are composed of one or more cells. b. Cells come from other cells by division. c. Cells are the smallest living things. d. Eukaryotic cells have evolved from prokaryotic cells.

8 Which of the following statements is NOT part of the cell theory? a. All organisms are composed of one or more cells. b. Cells come from other cells by division. c. Cells are the smallest living things. d. Eukaryotic cells have evolved from prokaryotic cells. ANSWER-D Visit site-

9 All cells have all of the following except a. plasma membrane. c. cytoplasm. b. genetic material. d. cell wall.

10 All cells have all of the following except a. plasma membrane. c. cytoplasm. b. genetic material. d. cell wall. ANSWER-D Visit site-

11 Eukaryotic cells are more complex than prokaryotic cells. Which of the following are found only in a eukaryotic cell? a. Cell wall b. Plasma membrane c. Endoplasmic reticulum d. Ribosomes

12 Eukaryotic cells are more complex than prokaryotic cells. Which of the following are found only in a eukaryotic cell? a. Cell wall b. Plasma membrane c. Endoplasmic reticulum d. Ribosomes ANSWER-C

13 The most important factor that limits the size of a cell is the a. quantity of proteins and organelles a cell can make. b. rate of diffusion of small molecules. c. surface area-to-volume ratio of the cell. d. amount of DNA in the cell.

14 The most important factor that limits the size of a cell is the a. quantity of proteins and organelles a cell can make. b. rate of diffusion of small molecules. c. surface area-to-volume ratio of the cell. d. amount of DNA in the cell. ANSWER-C

15 All eukaryotic cells possess each of the following except A. mitochondria. c. cytoskeleton. b. cell wall. d. nucleus. Visit site-

16 All eukaryotic cells possess each of the following except a. mitochondria. c. cytoskeleton. b. cell wall. d. nucleus. ANSWER-B Visit site-

17 Which of these organelles is NOT associated with the production or sorting of proteins in a cell? a. Ribosomes b. Smooth endoplasmic reticulum (SER) c. Rough endoplasmic reticulum (RER) d. Golgi apparatus

18 Visit site-

19 Different motor proteins like kinesin and myosin are similar in that they can A.interact with microtubules. b. use energy from ATP to produce movement. c. interact with actin. d. do both a and b. Visit site-

20 Different motor proteins like kinesin and myosin are similar in that they can a. interact with microtubules. b. use energy from ATP to produce movement. c. interact with actin. d. do both a and b. ANSWER-B

21 The protein sorting pathway involves the following organelles/ compartments in order: a. SER, RER, transport vesicle, Golgi. b. RER, lysosome, Golgi. c. RER, transport vesicle, Golgi, final destination. d. Golgi, transport vesicle, RER, final destination.

22 The protein sorting pathway involves the following organelles/ compartments in order: a. SER, RER, transport vesicle, Golgi. b. RER, lysosome, Golgi. c. RER, transport vesicle, Golgi, final destination. d. Golgi, transport vesicle, RER, final destination. ANSWER-C

23 Chloroplasts and mitochondria have many common features because both a. are present in plant cells. b. arose by endosymbiosis. c. function to oxidize glucose. d. function to produce glucose.

24 Chloroplasts and mitochondria have many common features because both a. are present in plant cells. b. arose by endosymbiosis. c. function to oxidize glucose. d. function to produce glucose. ANSWER-B Visit site-

25 Eukaryotic cells are composed of three types of cytoskeletal filaments. How are these three filaments similar? a. They contribute to the shape of the cell. b. They are all made of the same type of protein. c. They are all the same size and shape. d. They are all equally dynamic and flexible.

26 Eukaryotic cells are composed of three types of cytoskeletal filaments. How are these three filaments similar? a. They contribute to the shape of the cell. b. They are all made of the same type of protein. c. They are all the same size and shape. d. They are all equally dynamic and flexible. ANSWER-A

27 Plasmodesmata in plants and gap junctions in animals are functionally similar in that a. each is used to anchor layers of cells. b. they form channels between cells that allow diffusion of small molecules. c. they form tight junctions between cells. d. they are anchored to the extracellular matrix.

28 Plasmodesmata in plants and gap junctions in animals are functionally similar in that a. each is used to anchor layers of cells. b. they form channels between cells that allow diffusion of small molecules. c. they form tight junctions between cells. d. they are anchored to the extracellular matrix. ANSWER-B Visit site-

29 The smooth endoplasmic reticulum is a. involved in protein synthesis. b. a site of protein glycosylation. c. used to store a variety of ions. d. the site of lipid and membrane synthesis.

30 The smooth endoplasmic reticulum is a. involved in protein synthesis. b. a site of protein glycosylation. c. used to store a variety of ions. d. the site of lipid and membrane synthesis. ANSWER-D Visit site-

31 The cytoskeleton includes a. microtubules made of actin filaments. b. microfilaments made of tubulin. c. intermediate filaments made of twisted fibers of vimentin and keratin. d. smooth endoplasmic reticulum.

32 The cytoskeleton includes a. microtubules made of actin filaments. b. microfilaments made of tubulin. c. intermediate filaments made of twisted fibers of vimentin and keratin. d. smooth endoplasmic reticulum. ANSWER-C

33 Which of the following are differences between bacteria and archaea? a. The molecular architecture of their cell walls b. The type of ribosomes found in each c. Archaea have an internal membrane system that bacteria lack. d. Both a and b

34 Which of the following are differences between bacteria and archaea? a. The molecular architecture of their cell walls b. The type of ribosomes found in each c. Archaea have an internal membrane system that bacteria lack. d. Both a and b ANSWER-A Visit site-

35 Junctions that help form the blood brain barrier are (a) tight junctions (b) adhering junctions (c) desmosomes (d) gap junctions (e) plasmodesmata

36 Junctions that help form the blood brain barrier are (a) tight junctions (b) adhering junctions (c) desmosomes (d) gap junctions (e) plasmodesmata ANSWER-A

37 Junctions that permit the transfer of water, ions, and molecules between adjacent plant cells are (a) tight junctions (b) adhering junctions (c) desmosomes (d) gap junctions (e) plasmodesmata

38 Junctions that permit the transfer of water, ions, and molecules between adjacent plant cells are (a) tight junctions (b) adhering junctions (c) desmosomes (d) gap junctions (e) plasmodesmata ANSWER-E

39 Anchoring junctions that hold cells together at one point like a spot weld are (a) tight junctions (b) adhering junctions (c) desmosomes (d) gap junctions (e) plasmodesmata

40 Anchoring junctions that hold cells together at one point like a spot weld are (a) tight junctions (b) adhering junctions (c) desmosomes (d) gap junctions (e) plasmodesmata ANSWER-C

41 When a ligand binds with a receptor (a) tight junctions develop (b) a third messenger is activated (c) cell signaling is stopped (d) it activates the receptor (e) a G protein is destroyed

42 When a ligand binds with a receptor (a) tight junctions develop (b) a third messenger is activated (c) cell signaling is stopped (d) it activates the receptor (e) a G protein is destroyed ANSWER-D Visit site-

43 G proteins (a) relay a message from the activated receptor to an enzyme that activates a second messenger (b) are GTP molecules (c) stop cell signaling (d) directly activate protein kinases (e) Are hormones that function as first messengers

44 G proteins a. relay a message from the activated receptor to an enzyme that activates a second messenger (b) are GTP molecules (c) stop cell signaling (d) directly activate protein kinases (e) are hormones that function as first messengers ANSWER-A

45 A cell takes in dissolved materials by forming tiny vesicles around fluid droplets trapped by folds of the plasma membrane. This process is (a) carrier-mediated active transport (b) pinocytosis (c) receptormediated endocytosis (d) exocytosis (e) facilitated diffusion

46 A cell takes in dissolved materials by forming tiny vesicles around fluid droplets trapped by folds of the plasma membrane. This process is (a) carrier-mediated active transport (b) pinocytosis (c) receptormediated endocytosis (d) exocytosis (e) facilitated diffusion ANSWER-B

47 When plant cells are in a hypotonic medium, they (a) Undergo plasmolysis (b) build up turgor pressure (c) wilt (d) decrease pinocytosis (e) lose water to the environment

48 When plant cells are in a hypotonic medium, they (a) undergo plasmolysis (b) build up turgor pressure (c) wilt (d) decrease pinocytosis (e) lose water to the environment ANSWER-B Visit site-

49 After a ligand binds to receptors in coated pit (a) the ligand binds to receptors in coated vesicle (b) a coated vesicle forms by endocytosis (c) a vesicle enters the cytosol by facilitated diffusion (d) lysosomes destroy protein coating of the pit (e) G proteins signal phagocytosis

50 After a ligand binds to receptors in coated pit (a) the ligand binds to receptors in coated vesicle (b) a coated vesicle forms by endocytosis (c) a vesicle enters the cytosol by facilitated diffusion (d) lysosomes destroy protein coating of the pit (e) G proteins signal phagocytosis ANSWER-B

51 In signal transduction (a) an extracellular signal is converted to an intracellular signal (b) a signal is relayed through a series of molecules in the membrane (c) signal molecules are destroyed before target cells can respond to the signal (d) answers a, b, and c are correct (e) only answers a and b are correct

52 In signal transduction (a) an extracellular signal is converted to an intracellular signal (b) a signal is relayed through a series of molecules in the membrane (c) signal molecules are destroyed before target cells can respond to the signal (d) answers a, b, and c are correct (e) only answers a and b are correct ANSWER-E Visit site-

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54 The patch clamp technique (a) cannot be applied to plant cells (b) is mainly used to study exocytosis (c) allows researchers to study single ion channels (d) helped researchers understand signal transduction involving G proteins (e) was developed by Singer and Nicolson

55 The patch clamp technique (a) cannot be applied to plant cells (b) is mainly used to study exocytosis (c) allows researchers to study single ion channels (d) helped researchers understand signal transduction involving G proteins (e) was developed by Singer and Nicolson ANSWER-C Visit site-

56 The action of sodium-potassium pumps is an example of (a) carrier-mediated active transport (b) pinocytosis (c) aquaporin transport (d) exocytosis (e) facilitated diffusion

57 The action of sodium-potassium pumps is an example of (a) carrier-mediated active transport (b) pinocytosis (c) aquaporin transport (d) exocytosis (e) facilitated diffusion ANSWER-A

58 Which of the following is an example of carrier-mediated transport? (a) simple diffusion (b) facilitated diffusion (c) movement of water through aquaporins (d) osmosis (e) osmosis when a cell is in a hypertonic solution

59 Which of the following is an example of carrier-mediated transport? (a) simple diffusion (b) facilitated diffusion (c) movement of water through aquaporins (d) osmosis (e) osmosis when a cell is in a hypertonic solution ANSWER-B Visit site-

60 Which of the following processes requires the cell to expend metabolic energy directly (for example, from ATP)? (a) active transport (b) facilitated diffusion (c) all forms of carrier-mediated transport (d) osmosis (e) simple diffusion

61 Which of the following processes requires the cell to expend metabolic energy directly (for example, from ATP)? (a) active transport (b) facilitated diffusion (c) all forms of carrier-mediated transport (d) osmosis (e) simple diffusion ANSWER-C

62 Which of the following is not a function of the plasma membrane? (a) transports materials (b) helps to structurally link cells together (c) manufactures proteins (d) anchors the cell to the extracellular matrix (e) has receptors that relay signals

63 Which of the following is not a function of the plasma membrane? (a) transports materials (b) helps to structurally link cells together (c) manufactures proteins (d) anchors the cell to the extracellular matrix (e) has receptors that relay signals ANSWER-C