Biology ยท Science General
Cell Biology and Structure
3,062 Questions
Cell biology focuses on the structure and function of cellular organelles. Key topics include cellular respiration, DNA inheritance, and energy production. These fundamental biology concepts are crucial for medical entrance and state service examinations.
Cell organelles functionsCellular respiration sitesDNA and ribosomesAnimal cell structurePlant cell components
Cell Biology and Structure Questions
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Cell Membrane
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Cell Wall
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Nucleus
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Ribosome
C
Correct answer
Explanation
The nucleus contains the cell's genetic material (DNA) and acts as the control center for cellular activities.
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Endomembrane
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Smooth ER
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Golgi Apparatus
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Cytoskeleton
A
Correct answer
Explanation
The endomembrane system is a group of membranes and organelles in eukaryotic cells that works together to modify, package, and transport lipids and proteins.
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All living things are composed of cells.
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Cells are the basic units of structure in living things.
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Cells are spontaneously produced from nonliving matter.
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New cells are produced from existing cells.
C
Correct answer
Explanation
Cell theory states that all living things are made of cells, cells are the basic unit of life, and all cells come from pre-existing cells. Spontaneous generation was disproven by experiments like those of Pasteur.
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ribosomes
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nucleus
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cytoplasm
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plasma membrane
B
Correct answer
Explanation
The defining feature of a eukaryotic cell is the presence of a membrane-bound nucleus that houses the genetic material.
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preexisting cells
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free cell formation
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spontaneous generation
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crystalization
A
Correct answer
Explanation
Cell theory posits that all cells arise from pre-existing cells through the process of cell division.
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atoms
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molecules
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cells
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elements
C
Correct answer
Explanation
Cells are considered the basic unit of structure and function in all living organisms.
B
Correct answer
Explanation
Robert Hooke coined the term 'cell' because the structures he observed in cork under a microscope reminded him of the small rooms (cellulae) inhabited by monks.
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having more than one phone
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having more than one room
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made up of a single cell
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made up of more than one cell
D
Correct answer
Explanation
The prefix 'multi-' means many. Therefore, a multicellular organism is one composed of many cells rather than just one.
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a room
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the smallest unit of life
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a phone
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some unknown word
B
Correct answer
Explanation
In biology, the cell is defined as the basic structural, functional, and biological unit of all known living organisms.
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prokaryotic
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karyotic
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eukaryotic
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antikaryotic
C
Correct answer
Explanation
Eukaryotic cells are defined by having a membrane-bound nucleus and other membrane-bound organelles. Prokaryotic cells lack these structures.
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Cytoplasm and Mitochondria
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Cytoplasm only
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Nucleus and cytoplasm
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Nucleus and Golgi apparatus
A
Correct answer
Explanation
Aerobic respiration begins in the cytoplasm (glycolysis) and is completed in the mitochondria (Krebs cycle and electron transport chain).
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Nucleus
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Cytoplasm
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Mitochondria
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Golgi apparatus
B
Correct answer
Explanation
Glycolysis, the pathway for anaerobic respiration, occurs entirely within the cytoplasm of the cell.
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cell membrane
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cell wall
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lysosome
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nucleus
A
Correct answer
Explanation
The cell membrane is a selectively permeable barrier that controls the movement of substances into and out of the cell.
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mitochondria
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chloroplasts
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ribosomes
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lysosome
A
Correct answer
Explanation
Mitochondria are the organelles responsible for cellular respiration, converting chemical energy from food into ATP.
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DNA
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endoplasmic reticulum
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cell wall
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cell membrane
B
Correct answer
Explanation
Prokaryotic cells lack membrane-bound organelles, such as the endoplasmic reticulum, nucleus, or mitochondria.