Biology · 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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Nail
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Hair
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Skin
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Blood Tissues
B
Correct answer
Explanation
Hair is the fastest-growing tissue in the human body, growing about 1.25 cm per month. This outpaces nails and skin regeneration rates. The growth occurs in hair follicles through rapid cell division in the matrix.
A
Correct answer
Explanation
This statement is correct. Neurons (brain cells) can indeed survive and function for a person's entire lifetime, making them among the longest-living cells in the human body. Unlike most other cell types that regularly undergo cell division and replacement, most neurons are post-mitotic, meaning they don't divide after formation. While some neurons do die with aging or injury, many cerebral cortex neurons persist from birth until death, potentially living 80-100+ years. This longevity is why brain injuries are so devastating - lost neurons typically aren't replaced.
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dead cell
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animal cell
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plant cell
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human cell
C
Correct answer
Explanation
Plant cells are the only option among these that contain both plastids (like chloroplasts for photosynthesis) and large central vacuoles. Plastids are membrane-bound organelles unique to plant and algal cells, while vacuoles store water, nutrients, and help maintain cell structure.
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plant cell
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human cell
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dead cell
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red blood cell
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B1-G10
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B1.G10
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B1:G10
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B1;G10
C
Correct answer
Explanation
Excel uses a colon (:) to specify ranges. The format is always top-left cell:bottom-right cell. For a range starting at B1 and extending to G10, the correct notation is B1:G10.
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A. to one another and also adopt
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B. one to the other, and also they adopt
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C. one to the other, but also adopting
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D. to one another but also adopt
D
Correct answer
Explanation
The "not only... but also" construction requires parallel verb forms. "Not only adhere... but also adopt" keeps both verbs in base form after the auxiliary.
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A. to one another and also adopt
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B. one to the other, and also they adopt
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C. one to the other, but also adopting
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D. to one another but also adopt
D
Correct answer
Explanation
This question tests parallel structure and correct conjunction use. The sentence structure 'not only...but also' requires parallel verb forms. Option D correctly provides 'to one another but also adopt' - both infinitive verbs ('adhere' and 'adopt') are in base form, creating proper parallel structure. Option A uses 'to one another and also adopt' which is acceptable but less precise. Options B and C incorrectly use 'one to the other' and introduce inconsistent verb forms, disrupting the parallel structure required by 'not only...but also'.
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mcells
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fragments
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inodes table
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cylinder group
C
Correct answer
Explanation
Journaling file systems like JFS and ext3/ext4 maintain an inode table to track file metadata and locations. The journal itself is a circular log that records changes before they're committed to the main file system. Options like 'mcells' and 'fragments' are not standard file system structures, while 'cylinder group' is specific to BSD Unix File System (UFS), not journaling file systems.
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Border
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Beacon
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Standard
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EC
C
Correct answer
Explanation
In cellular networks, Standard cell types are used for soft handoff scenarios. Soft handoff allows a mobile device to communicate with multiple base stations simultaneously during transition, and Standard cells are designed to support this seamless handover mechanism. Border, Beacon, and EC (Emergency Center) cell types serve other purposes.
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Consolidated cells are zero
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Leaf level cells are zero
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Calculation time is slower
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Calculation results are incorrect
A
Correct answer
Explanation
An under-fed rule occurs when consolidated cells show zero values because leaf-level cells feeding them don't have sufficient data or the rule doesn't properly propagate values upward through the hierarchy.
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It is the outermost layer of the skin.
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It helps for elimination of waste products.
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It helps in absorption of water.
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It is a protective tissue in animal body.
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It helps for binding, supporting and packing.
E
Correct answer
Explanation
It is a function of connective tissue.
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appearance
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nucleus
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functions
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location
C
Correct answer
Explanation
The shape and structure of a cell depends on the functions that it performs.
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Nucleus
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Lysosome
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Mitochondrion
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Chloroplast
B
Correct answer
Explanation
Lysosome is a single membrane-bound cell organelle.
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golgi apparatus
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ribosome
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mitochondria
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vacuole
C
Correct answer
Explanation
DNA (Deoxyribonucleic acid) is present in the nucleus of the cell. Along with nucleus, DNA is also present in mitochondria and chloroplast, but not in golgi apparatus, ribosome and vacuole.
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Animal cell has centrally placed nucleus.
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Animal cell is prokaryotic in nature.
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Cellulose provides structural strength to plants.
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Both animal cell and plant cell contain a nucleus with chromosome.
B
Correct answer
Explanation
This statement is false. An animal cell is a form of eukaryotic cell that makes up many tissues in animals.