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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plasma membrane
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peptidoglycan layer
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lipopolysaccharide
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cytoplasm
A
Correct answer
Explanation
In Gram-negative cells, M-ring of flagella is embedded in plasma membrane.
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unicellular
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bicellular
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multicellular
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tricellular
C
Correct answer
Explanation
The hair found on stem is multicellular.
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Acanthosome
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Aurosome
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Carboxysome
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Catalysome
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Cercidosome
C
Correct answer
Explanation
Carboxysome is an inclusion body, present in some blue-green algae and autotrophic bacteria, that contains the enzyme ribulose-1,5-bisphosphate carboxylase and that functions in the fixation of carbon dioxide by these organisms.
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Vacuoles
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Mitochondria
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Plastids
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Cell wall
C
Correct answer
Explanation
Meristematic cells do not contain plastids as they do not carry out photosynthesis.
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chromoplasts
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leucoplasts
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mitochondria
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vacuoles
B
Correct answer
Explanation
In plant cells, the synthesis of palmitic acid takes place in leucoplasts.
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pigment synthesis and storage
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dismantling of the photosynthetic apparatus
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protein modification
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detecting gravity
B
Correct answer
Explanation
Gerontoplasts are involved in dismantling of the photosynthetic apparatus during senescence.
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Cell wall and nuclei
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Mitochondria and nuclear membrane
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Nuclei and ribosomes
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Golgi bodies and vacuoles
C
Correct answer
Explanation
Sieve tube elements lack nuclei and ribosomes.
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lysigenous intercellular space
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schizogenous intercellular space
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gap junction
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phragmosome
B
Correct answer
Explanation
The space resulting from separation of cell walls from each other, as the cells grow older by partial dissolution of inter-cellular substance, is called schizogenous intercellular space.
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ribosome
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spherosome
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peroxisome
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centrosome
C
Correct answer
Explanation
Peroxisomes are essential organelles in photorespiration, where they process glycolate produced by RuBisCO oxygenase activity. The photorespiratory pathway involves three organelles: chloroplast (where glycolate is produced), peroxisome (where glycolate is converted to glycine), and mitochondria (where glycine is decarboxylated). Ribosomes, spherosomes, and centrosomes are not involved in this process.
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golgi body
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endoplasmic reticulum
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lysosomes
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mitochondria
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spherosomes
B
Correct answer
Explanation
Myeloid bodies and nissl granules are believed to be formed from endoplasmic reticulum.
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Glucose 6-phosphatase
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Peptidase
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β-glucuronidase
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Nucleotidase
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Amylase
D
Correct answer
Explanation
The enzyme nucleotidase is present on the cytoplasmic surface of endoplasmic reticulum.
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liver cells
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mature erythrocyte
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kidney cells
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mature leucocytes
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fungi
B
Correct answer
Explanation
Endoplasmic reticulum is not found in mature erythrocyte. So, this is the correct answer.
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Cyto b5
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Reductase
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Nucleotidase
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P-450
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Glucose 6-phosphatase
E
Correct answer
Explanation
Glucose 6-phosphatase is present on the luminar surface of the endoplasmic reticulum.
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mitochondria
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golgi bodies
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endoplasmic reticulum
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lysosomes
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plastids
C
Correct answer
Explanation
A membrane lined system of channels present throughout the cytoplasm is called endoplasmic reticulum. So, this is the correct answer.
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Rough endoplasmic reticulum
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Smooth endoplasmic reticulum
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Sarcoplasmic reticulum
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Cisternae
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Vesicles
B
Correct answer
Explanation
Correct answer. The endoplasmic reticulum without attached ribosomes is called a granular or smooth endoplasmic reticulum.