Biology Self-Quiz Unit 3

Dashboard / My courses / Started on State Completed on Time taken / 16 September - 22 September / Self-Quiz Unit 3 Wednesday, 22 September 2021, 9:10 AM Finished Wednesday, 22 September 2021, 9:17 AM 7 mins 16 secs Marks 24.00/27.00 Grade 88.89 out of 100.00 Question 1 Correct Mark 1.00 out of 1.00 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 The correct answer is: special stains Question 2 Correct Mark 1.00 out of 1.00 The __________ is the basic unit of life. Select one: a. organism b. cell c. tissue d. organ The correct answer is: cell  Question 3 Incorrect Mark 0.00 out of 1.00 Prokaryotes depend on __________ to obtain some materials and to get rid of wastes. Select one: a. ribosomes b. flagella c. cell division  d. diffusion The correct answer is: diffusion Question 4 Correct Mark 1.00 out of 1.00 Bacteria that lack fimbriae are less likely to __________. Select one: a. adhere to cell surfaces b. swim through bodily fluids c. synthesize proteins d. retain the ability to divide The correct answer is: adhere to cell surfaces  Question 5 Correct Mark 1.00 out of 1.00 Which of the following is surrounded by two phospholipid bilayers? Select one: a. the ribosomes b. the vesicles c. the cytoplasm d. the nucleoplasm  The correct answer is: the nucleoplasm Question 6 Incorrect Mark 0.00 out of 1.00 Peroxisomes got their name because hydrogen peroxide is: Select one: a. used in their detoxification reactions b. produced during their oxidation reactions c. incorporated into their membranes d. a cofactor for the organelles’ enzymes The correct answer is: produced during their oxidation reactions  Question 7 Correct Mark 1.00 out of 1.00 In plant cells, the function of the lysosomes is carried out by __________. Select one: a. vacuoles  b. peroxisomes c. ribosomes d. nuclei The correct answer is: vacuoles Question 8 Correct Mark 1.00 out of 1.00 Which of the following is found both in eukaryotic and prokaryotic cells? Select one: a. nucleus b. mitochondrion c. vacuole d. ribosomes The correct answer is: ribosomes  Question 9 Correct Mark 1.00 out of 1.00 Which of the following is not a component of the endomembrane system? Select one: a. mitochondrion  b. Golgi apparatus c. endoplasmic reticulum d. lysosome The correct answer is: mitochondrion Question 10 Correct Mark 1.00 out of 1.00 The process by which a cell engulfs a foreign particle is known as: Select one: a. endosymbiosis b. phagocytosis c. hydrolysis d. membrane synthesis The correct answer is: phagocytosis  Question 11 Correct Mark 1.00 out of 1.00 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 The correct answer is: a cell that makes steroid hormones Question 12 Correct Mark 1.00 out of 1.00 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; modification 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; modification 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 The correct answer is: synthesis of the protein on the ribosome; modification in the endoplasmic reticulum; tagging in the Golgi; distribution via the vesicle  Question 13 Correct Mark 1.00 out of 1.00 Which of the following have the ability to disassemble and reform quickly? Select one: a. microfilaments and intermediate filaments b. microfilaments and microtubules c.  intermediate filaments and microtubules d. only intermediate filaments The correct answer is: microfilaments and microtubules Question 14 Correct Mark 1.00 out of 1.00 Which of the following do not play a role in intracellular movement? Select one: a. microfilaments and intermediate filaments b. microfilaments and microtubules c. intermediate filaments and microtubules d. only intermediate filaments The correct answer is: only intermediate filaments  Question 15 Correct Mark 1.00 out of 1.00 Which of the following are found only in plant cells? Select one: a. gap junctions b. desmosomes c. plasmodesmata  d. tight junctions The correct answer is: plasmodesmata Question 16 Correct Mark 1.00 out of 1.00 The key components of desmosomes are cadherins and __________. Select one: a. actin b. microfilaments c. intermediate filaments d. microtubules The correct answer is: intermediate filaments  Question 17 Correct Mark 1.00 out of 1.00 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 The correct answer is: protein Question 18 Correct Mark 1.00 out of 1.00 Which characteristic of a phospholipid contributes to the fluidity of the membrane? Select one: a. its head b. cholesterol c. a saturated fatty acid tail d. double bonds in the fatty acid tail The correct answer is: double bonds in the fatty acid tail  Question 19 Correct Mark 1.00 out of 1.00 What is the primary function of carbohydrates attached to the exterior of cell membranes? Select one: a. identification of the cell  b. flexibility of the membrane c. strengthening the membrane d. channels through membrane The correct answer is: identification of the cell Question 20 Correct Mark 1.00 out of 1.00 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 d. from an area with a low concentration of water to one of higher concentration The correct answer is: from an area with a high concentration of water to one of lower concentration  Question 21 Correct Mark 1.00 out of 1.00 The principal force driving movement in diffusion is the __________. Select one: a. temperature b. particle size c. concentration gradient  d. membrane surface area The correct answer is: concentration gradient Question 22 Incorrect Mark 0.00 out of 1.00 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. c. Only salt water poses problems for animals that live in it. d. Their bodies tend to lose too much water to their environment. The correct answer is: Their bodies tend to take in too much water.  Question 23 Correct Mark 1.00 out of 1.00 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. diffusion is constantly moving solutes in opposite directions  The correct answer is: diffusion is constantly moving solutes in opposite directions Question 24 Correct Mark 1.00 out of 1.00 How does the sodium-potassium pump make the interior of the cell negatively charged? Select one: a. by expelling anions b. by pulling in anions c. by expelling more cations than are taken in d. by taking in and expelling an equal number of cations The correct answer is: by expelling more cations than are taken in  Question 25 Correct Mark 1.00 out of 1.00 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. The correct answer is: It fuses with and becomes part of the plasma membrane. Question 26 Correct Mark 1.00 out of 1.00 Which transport mechanism can bring whole cells into a cell? Select one: a. pinocytosis b. phagocytosis c. facilitated transport d. primary active transport The correct answer is: phagocytosis  Question 27 Correct Mark 1.00 out of 1.00 In what important way does receptor-mediated endocytosis differ from phagocytosis? Select one: a. It transports only small amounts of fluid. b. It does not involve the pinching off of membrane. c. It brings in only a specifically targeted substance.  d. It brings substances into the cell, while phagocytosis removes substances. The correct answer is: It brings in only a specifically targeted substance. ◄ Written Assignment Unit 3 Jump to... Graded Quiz Unit 3 ►