Unit 1: An overview of cells - Practice Quiz

1 Who first used the term "cell" after observing thin slices of cork?

2 Which scientist was among the first to observe living microorganisms using a microscope?

3 What is the basic structural and functional unit of life?

4 Which process allows cells to produce new cells?

5 Which structure controls the movement of many substances into and out of a cell?

6 What does the unity of cells refer to?

7 Why do cells have different shapes and structures?

8 Which instrument is commonly used to observe cells?

9 What is magnification?

10 Which tool is often used to add color to cell structures for easier observation?

11 Which type of cell lacks a membrane-bound nucleus?

12 Which type of cell contains a membrane-bound nucleus?

13 Which organism is made of prokaryotic cells?

14 Which structure is found in plant cells but not usually in animal cells?

15 Which structure gives additional support and protection to plant cells?

16 Which organelle is commonly called the control center of a eukaryotic cell?

17 Which cell component contains the cell's genetic material in most eukaryotic cells?

18 What is the jelly-like material that fills much of a cell called?

19 Why are viruses generally not considered cellular organisms?

20 What is a viroid?

21 A scientist observes repeated box-like compartments in a thin slice of cork. Which conclusion is most directly supported by this observation?

22 Why was Leeuwenhoek’s work important in the history of cell biology?

23 A cell is placed in an environment where nutrients are available, but its plasma membrane becomes unable to regulate transport. Which function would be most directly disrupted?

24 A cell maintains a stable internal pH despite changes in its surroundings. This ability is an example of:

25 A mutation prevents a cell from producing proteins needed for energy metabolism. Which cellular property would be affected most immediately?

26 Muscle cells and nerve cells have different shapes and functions, yet both contain DNA and ribosomes. What does this best illustrate?

27 Two organisms have cells with plasma membranes, ribosomes, and genetic material. One organism is unicellular, while the other is multicellular. Which conclusion is most appropriate?

28 A student switches from a objective lens to a objective while using a ocular lens. What is the new total magnification?

29 A specimen appears enlarged but blurry when viewed under a light microscope. Which adjustment would most directly improve sharpness without changing magnification?

30 A stain is added to an unstained cheek-cell sample before microscopy. What is the primary purpose of the stain?

31 A newly discovered cell contains DNA in a nucleoid region but has no membrane-bound nucleus. How should it be classified?

32 A drug blocks the function of the endoplasmic reticulum in a cell. The drug would affect eukaryotic cells more directly because they:

33 Which observation would provide the strongest evidence that a cell is eukaryotic?

34 A plant cell is placed in bright light and supplied with carbon dioxide. Which organelle is most directly involved in converting light energy into chemical energy?

35 A cell has a large central vacuole, a cellulose cell wall, and chloroplasts. Which type of cell is it most likely to be?

36 If lysosomes in an animal cell stop functioning, which process would be most directly impaired?

37 Why are most cells relatively small rather than extremely large?

38 A cell’s volume increases substantially while its surface area increases only slightly. Which consequence is most likely?

39 A toxin damages ribosomes but leaves the plasma membrane intact. Which cellular activity would be affected first?

40 A virus can reproduce only after entering a host cell. What does this indicate about viruses?

41 Why did Robert Hooke's observations of cork lead to the term "cell" without establishing that all living organisms are cellular?

42 Which observation most directly supported Schleiden and Schwann's cell theory while also exposing a limitation later corrected by Virchow?

43 A synthetic compartment contains enzymes, genetic material, and a selectively permeable boundary but cannot maintain internal conditions or reproduce independently. Which conclusion is most appropriate?

44 Why is compartmentalization especially important for a large metabolically active cell?

45 A bacterium and a human cell both synthesize proteins using ribosomes. Which inference best illustrates cellular unity without ignoring cellular diversity?

46 Two cells have similar genomes but differ greatly in shape, metabolism, and function. Which mechanism most plausibly accounts for this difference?

47 A specimen appears blurred because structures outside the focal plane contribute light to the image. Which method would most directly improve optical sectioning?

48 A researcher wants to observe organelle ultrastructure at nanometer-scale resolution but must examine fixed, nonliving material. Which choice is most suitable?

49 A fluorescent label is visible only when its target is abundant, even though the target is present throughout the cell. Which limitation most likely explains this result?

50 A cell contains circular DNA, 70S ribosomes, and a plasma membrane but no nucleus. Which additional observation would most strongly distinguish it from a typical bacterium?

51 Why can a prokaryotic cell divide rapidly despite lacking the extensive internal membrane system of a eukaryotic cell?

52 An antibiotic inhibits bacterial ribosomes but has little immediate effect on cytosolic protein synthesis in a human cell. Which explanation is most defensible?

53 A plant cell placed in a hypotonic solution does not normally burst, whereas an animal cell may lyse. Which structural difference best explains this outcome?

54 A mutation prevents formation of functional plasmodesmata in a plant tissue. Which process would be most directly disrupted?

55 A cell has chloroplasts, a large central vacuole, and cellulose walls but lacks mitochondria. Which prediction is most accurate?

56 If a spherical cell doubles its radius while retaining the same composition, how do its surface-area-to-volume ratio and diffusion challenge change?

57 A cell's volume increases eightfold while its radius changes proportionally. Which change would occur if its shape remained spherical?

58 Which cell design most effectively maintains rapid exchange with the environment while increasing total metabolic capacity?

59 A pathogen contains a short circular RNA molecule, has no capsid, and replicates only within plant cells. Which classification best fits it?

60 Why is a virus generally excluded from definitions of autonomous cellular life even when it carries genetic information and evolves?