Self-Quiz Unit 3: Attempt review PDF

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Self-Quiz Unit 3: Attempt review...

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Self-Quiz Unit 3: Attempt review

30/11/2020, 8:35 PM

Home ! My courses ! BIOL 1121 - AY2021-T2 ! 26 November - 2 December ! Self-Quiz Unit 3 Monday, 30 November 2020, Started on 7:59 PM State

Finished Monday, 30 November 2020, 8:34 PM

Completed on Time taken

35 mins 54 secs

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27.00/27.00

Grade 100.00 out of 100.00

Question 1

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When viewing a specimen through a light microscope, scientists use __________ to distinguish the individual components of cells. Select one: a. a beam of electrons b. radioactive isotopes c. special stains d. high temperatures

2 The __________ is the basic unit of life. Select one: a. organism b. cell

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c. tissue d. organ

Question 3

Prokaryotes depend on __________ to obtain some materials and to get rid of wastes. Select one: a. ribosomes b. !agella c. cell division d. di"usion

4 Bacteria that lack #mbriae are less likely to __________. Select one: a. adhere to cell surfaces b. swim through bodily !uids c. synthesize proteins d. retain the ability to divide

Question 5

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Which of the following is surrounded by two phospholipid bilayers? Select one: a. the ribosomes b. the vesicles c. the cytoplasm d. the nucleoplasm

6 Peroxisomes got their name because hydrogen peroxide is: Select one: a. used in their detoxi#cation reactions b. produced during their oxidation reactions

c. incorporated into their membranes d. a cofactor for the organelles’ enzymes

Question 7

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In plant cells, the function of the lysosomes is carried out by __________. Select one:

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a. vacuoles b. peroxisomes c. ribosomes d. nuclei

8 Which of the following is found both in eukaryotic and prokaryotic cells? Select one: a. nucleus b. mitochondrion c. vacuole d. ribosomes

Question 9

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Which of the following is not a component of the endomembrane system? Select one: a. mitochondrion b. Golgi apparatus c. endoplasmic reticulum

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d. lysosome10

The process by which a cell engulfs a foreign particle is known as: Select one: a. endosymbiosis b. phagocytosis c. hydrolysis d. membrane synthesis

Question

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Which of the following is most likely to have the greatest concentration of smooth endoplasmic reticulum? Select one: a. a cell that secretes enzymes b. a cell that destroys pathogens c. a cell that makes steroid hormones d. a cell that engages in photosynthesis

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12

Which of the following sequences correctly lists in order the steps involved in the incorporation of a proteinaceous molecule within a cell? Select one: a. synthesis of the protein on the ribosome; modi#cation in the Golgi apparatus; packaging in the endoplasmic reticulum; tagging in the vesicle b. synthesis of the protein on the lysosome; tagging in the Golgi; packaging in the vesicle; distribution in the endoplasmic reticulum c. synthesis of the protein on the ribosome; modi#cation in the endoplasmic reticulum; tagging in the Golgi; distribution via the vesicle d. synthesis of the protein on the

lysosome; packaging in the vesicle; distribution via the Golgi; tagging in the endoplasmic reticulum

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13

Which of the following have the ability to disassemble and reform quickly? Select one: a. micro#laments and intermediate #laments b. micro#laments and microtubules c. intermediate #laments and microtubules d. only intermediate #laments

Question

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Which of the following do not play a role in intracellular movement? Select one: a. micro#laments and intermediate #laments b. micro#laments and microtubules c. intermediate #laments and microtubules d. only intermediate #laments

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15

Which of the following are found only in plant cells? Select one: a. gap junctions b. desmosomes c. plasmodesmata d. tight junctions

Question

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The key components of desmosomes are cadherins and __________. Select one: a. actin b. micro#laments c. intermediate #laments d. microtubules

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17

Which plasma membrane component can be either found on its surface or embedded in the membrane structure? Select one: a. protein b. cholesterol c. carbohydrate d. phospholipid

Question

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Which characteristic of a phospholipid contributes to the !uidity of the membrane? Select one: a. its head b. cholesterol c. a saturated fatty acid tail d. double bonds in the fatty acid tail

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19

What is the primary function of carbohydrates attached to the exterior of cell membranes? Select one: a. identi#cation of the cell b. !exibility of the membrane c. strengthening the membrane d. channels through membrane

Question

20

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Water moves via osmosis __________. Select one: a. throughout the cytoplasm b. from an area with a high concentration of other solutes to a lower one c. from an area with a high concentration of water to one of lower concentration

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d. from an area with a low concentration of water to one of higher concentration

21

The principal force driving movement in di"usion is the __________. Select one: a. temperature b. particle size c. concentration gradient d. membrane surface area

Question

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What problem is faced by organisms that live in fresh water? Select one: a. Their bodies tend to take in too much water. b. They have no way of controlling their tonicity.

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c. Only salt water poses problems for animals that live in it. d. Their bodies tend to lose too much water to their environment.

23

Active transport must function continuously because __________. Select one: a. plasma membranes wear out b. not all membranes are amphiphilic c. facilitated transport opposes active transport d. di"usion is constantly moving solutes in opposite directions

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How does the sodium-potassium pump make the interior of the cell negatively charged? Select one: a. by expelling anions

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b. c. in

by pulling in anions by expelling more cations than are taken

d. by taking in and expelling an equal number of cations

25

What happens to the membrane of a vesicle after exocytosis? Select one: a. It leaves the cell. b. It is disassembled by the cell. c. It fuses with and becomes part of the plasma membrane. d. It is used again in another exocytosis event.

Question

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Which transport mechanism can bring whole cells into a cell? Select one:

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a. pinocytosis b. phagocytosis c. facilitated transport d. primary active transport

27

In what important way does receptormediated endocytosis di"er from phagocytosis? Select one: a. It transports only small amounts of !uid. b. It does not involve the pinching o" of membrane. c. It brings in only a speci#cally targeted substance. d. It brings substances into the cell, while phagocytosis removes substances.

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