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Question 71 BIO 101 | LAUTECH 100L
A
complete permeability  
B
semipermeability  
C
differential permeability  
D
impermeability.  
Explanation.
Share Answer Cell wall shows complete permeability because it helps in the transport of substances into and out of the cell. The main function of cell wall is to provide mechanical support.

Correct Option:
A
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Question 72 BIO 101 | LAUTECH 100L
A
deposition  
B
apposition  
C
intussusception  
D
aggregation.  
Explanation.
Share Answer Addition of new cell wall particles amongst the existing one is intussusception. Growth of cell wall occurs by two methods – By intussusception and by opposition. By intussusception, the primary wall is stretched and materials of secondary wall are deposited. By opposition, materials of secondary wall are deposited in the form of thin layers.

Correct Option:
C
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Question 73 BIO 101 | LAUTECH 100L
A
respiration  
B
photosynthesis  
C
protein synthesis  
D
fat synthesis.  
Explanation.
Share Answer Ribosomes are the centre for protein synthesis. Free ribosomes synthesize structural proteins, proteins normally found in microbodies, chloroplast and mitochondria and proteins destained to remain in cytosol such as enzymes of glycolysis or proteins of cytoskeleton. On the other hand, ribosomes attached on ER synthesize proteins for transport, integral or intrinsic proteins of membrane and proteins of certain organelles like Golgi complex, lysosomes and plant vacuoles.

Correct Option:
C
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Question 74 BIO 101 | LAUTECH 100L
A
thyiakoids  
B
mitochondrial surface  
C
inner mitochondrial membrane  
D
chloroplast surface.  
Explanation.
Share Answer Oxysomes of F0 – F1 particles occurs on inner mitochondrial membrane. Each particle is made up of base, stalk and head and is about 10 mm in length. The number of oxysomes per mitochondrion varies from 104 -105. Chemically these are made up of phospholipid core and protein cortex. Oxysomes have ATP as enzyme molecules and therefore, responsible for ATP synthesis. These elementary particles are also called F0 – F, particles by some workers. The base of these is called F0 subunit and head is called F, subunit.

Correct Option:
C
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Question 75 BIO 101 | LAUTECH 100L
A
store starch, lipids and proteins  
B
get transformed from one type to another  
C
perform same function  
D
be present together.  
Explanation.
Share Answer All plastids have similar structure because they can get transformed from one type to another. These are involved in the formation and storage of soluble and insoluble carbohydrates. Plastids are of three types namely – chloroplasts, leucoplasts and chromoplasts.

Correct Option:
B
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Question 76 BIO 101 | LAUTECH 100L
A
nucleolus  
B
lysosome  
C
mitochondrion  
D
plastid.  
Explanation.
Share Answer An outer covering membrane is absent over nucleolus. Nucleolus is a dense, spherical, colloidal body which remains attached with nucleolar organizing chromosomes. It was discovered by Fontana (1781) and termed as nucleolus by Bowman (1840). The main function of nucleolus is the synthesis of ribosomal RNA and it is called store house of RNA. It plays important role in cell division also.

Correct Option:
A
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Question 77 BIO 101 | LAUTECH 100L
A
golgi apparatus  
B
endoplasmic reticulum  
C
microfilaments  
D
microtubules.  
Explanation.
Share Answer Apparato reticolare are Golgi apparatus. The Golgi apparatus was named after Camillo Golgi (1906) who discovered this cell structure in nerve cells (1898) and assigned it the role of a cell organelle. Inspired by its appearance, Golgi named this cell structure the inner reticular apparatus (apparato reticolare inferno).

Correct Option:
A
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Question 78 BIO 101 | LAUTECH 100L
A
cytoplasm in controlling differentiation  
B
nucleus in heredity  
C
chromosomes in heredity  
D
nucleo-cytoplasmic ratio.  
Explanation.
Share Answer Acetabularia used in Hammerling’s nucleocytoplasmic experiment is unicellular uninucleate green algae. Hammerling’s experiment of Acetabularia involved exchanging rhizoid and stalk. Presence of hereditary information in the nucleous was proved by the work of Hammerling on single called alga Acetabularia.

Correct Option:
B
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Question 79 BIO 101 | LAUTECH 100L
A
Perform the same function  
B
Store food materials like starch, fat and protein  
C
Occur in aerial parts  
D
Can transform from one form to another.  
Explanation.
Share Answer All the plastids have a common origin and one type of plastid can change into another. Plastids are of 2 main types’ lencoplasts and chromoplasts. The leucoplasts are colourless and occur in the cells not exposed to sunlight. The chromoplasts are coloured occur in the cells exposed to sunlight.

Correct Option:
D
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Question 80 BIO 101 | LAUTECH 100L
A
ultra centrifugation  
B
electron microscope  
C
light microscope  
D
X-rays crystallography.  
Explanation.
Share Answer X-rays crystallography is a technique which is used to study of binding protein on regulatory DNA sequence. In this technique, X-rays pass through a crystal of a substance and form a diffraction pattern. With the help of this technique, the arrangement of atoms in the molecular structure of enzymes, proteins, DNA, etc. can be studied. Wilkins, Watson and Crick used this technique to determine the molecular configuration of double helix of DNA.

Correct Option:
D
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