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Biology
Cell: The Unit of Life
137 questions from 38 papers, each with its answer.
- 137 questions
- 38 papers
- 3.89% of Biology
Reductionist Biology
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Which one of the following statements refers to Reductionist Biology?
Reductionist biology is the physico-chemical approach to studying living systems.
Reductionist Biology explains living systems and biological processes using basic principles of physics and chemistry at molecular and cellular levels.
Ribosomes
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From the statements given below choose the correct option:
A. The eukaryotic ribosomes are 80S and prokaryotic ribosomes are 70S.
B. Each ribosome has two sub-units.
C. The two sub-units of 80S ribosome are 60S and 40S while that of 70S are 50S and 30S.
D. The two sub-units of 80S ribosome are 60S and 20S and that of 70S are 50S and 20S.
E. The two sub-units of 80S are 60S and 30S and that of 70S are 50S and 30S.
Choose the correct answer from the options given below:Statements A, B, and C are true: 80S = 60S + 40S, 70S = 50S + 30S.
Ribosomes consist of large and small subunits. Eukaryotic 80S ribosomes are made of 60S and 40S subunits, whereas prokaryotic 70S ribosomes consist of 50S and 30S subunits. Thus A, B, and C are correct.
Prokaryotic Cell Structure
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A specialized membranous structure in a prokaryotic cell which helps in cell wall formation, DNA replication and respiration is:
Mesosomes are prokaryotic plasma membrane infoldings involved in replication, respiration, and wall synthesis.
Mesosomes are formed by the invagination of the plasma membrane in prokaryotes. They increase surface area for enzymatic activities and participate in cellular respiration, cell wall synthesis, DNA replication, and equal distribution of daughter chromosomes.
Endomembrane System - Golgi Apparatus
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Assertion (A): The primary function of the Golgi apparatus is to package the materials made by the endoplasmic reticulum and deliver it to intracellular targets and outside the cell.Reason (R): Vesicles containing materials made by the endoplasmic reticulum fuse with the cis face of the Golgi apparatus, and they are modified and released from the trans face of the Golgi apparatus.
Both A and R are true, and Reason explains how cis-to-trans transit enables packaging and targeting.
The Golgi apparatus principally packages and modifies macromolecules. Secretory vesicles bud off from the ER and fuse with the cis (forming) face of the Golgi, traverse the cisternae where post-translational modifications occur, and are sorted into transport vesicles at the trans (maturing) face.
Cell Organelles
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Match List-I with List-II.
Pick the matching item from Column II for each row.
Column I
- A. Centromere
- B. Cilium
- C. Cristae
- D. Cell membrane
Column II
- I. Mitochondrion
- II. Cell division
- III. Cell movement
- IV. Phospholipid Bilayer
Correct answer: A → II, B → III, C → I, D → IV
A-II, B-III, C-I, D-IV.
Centromere holds sister chromatids and binds kinetochores for chromosome segregation during cell division (II). Cilium functions in cellular motility (III). Cristae are folds in the inner mitochondrial membrane (I). The cell membrane consists of a lipid bilayer (IV).
That is every question in Cell: The Unit of Life for this filter.
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