BIO 101 | Study Mode

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Question 81
A
protoplasm as the physical basis of life
B
cell theory
C
theory of cell lineage
D
nucleus functions as control centre of cell.
Explanation
Names of Schleiden and Schwann are associated with cell theory in 1839. The concept that All living organisms are composed of cell is known as cell theory.

Correct option: B
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Question 82
A
it needs modification due to discovery of subcellular structures like chloroplasts and mitochondria
B
modified cell theory means that all living being are composed of ceils capable of reproducing
C
cell theory does not hold good because all living beings (e.g., viruses) do not have cellular organisation
D
cell theory means that all living objects consists of celis whether or not capable of reproducing.
Explanation
Cell theory does not hold good because all living beings (e.g., viruses) do not have cellular organisation. Viruses are exceptions to the cell theory as they are obligate parasites (subcellular in nature). Paramecium, Rhizopus, Vaucheria are some examples which may or may not be exceptions to the theory.

Correct option: C
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Question 83
A
absent
B
occasional
C
formed between nonhomologous chromosomes
D
formed between homologous chromosomes.
Explanation
In salivary gland chromosomes/polytene chromosomes, pairing is formed between homologous chromosomes. A characteristics feature of these chromosomes is that somatic pairing occurs in them and hence their number appears half of normal somatic cells.

Correct option: D
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Question 84
A
proteins
B
lipids
C
proteins and lipids
D
glycoproteins and glycolipids.
Explanation
Cell recognition and adhesion occur due to biochemicals of cell membranes named glycoproteins and glycolipids. These are formed due to small carbohydrate molecules present on lipids and extrinsic proteins.

Correct option: D
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Question 85
A

higher plants

B

yeast

C

bacteria and Blue-green algae

D

none.

Explanation

Golgi apparatus is absent in bacteria and blue green algae. Golgi bodies are absent in prokaryotic cells and present in eukaryotic cells except in male gametes of bryophytes and pteridophytes, mammalian RBCs, sieve tubes of plants and in cells of fungi.


Correct option: C
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Question 86
A
endoplasmic reticulum
B
nucleosome
C
lysosome
D
phagosome.
Explanation
Membranous bag with hydrolytic enzymes which is used for controlling intracellular digestion of macromolecule is lysosome. Lysosomes digest the substances (proteins, fats etc.) present inside the cell. This is done during starvation and thus nourishment is provided by lysosomes. Lysosomes are formed from Golgi apparatus and contain some 40 types of acid hydrolaseis.

Correct option: C
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Question 87
A
photorespiration
B
phototropism
C
photoperiodism
D
photosynthesis.
Explanation
In plant cells, peroxisomes are associated with photorespiration. Peroxisomes are found only in C3 plants where a wasteful phenomenon of photorespiration occurs. The other organelles associated with this process are chloroplast and mitochondria. Peroxisomes are also reported in animal cells, i.e., liver and kidney cells. The peroxisome contains several enzymes such as amino transferse, glycolate oxidase, glyoxylate reductase, peroxidase and catalase etc.

Correct option: A
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Question 88
A
DNA replication
B
RNA and protein synthesis
C
synthesis of polysaccharides
D
synthesis of lipids.
Explanation
Balbiani rings (puffs) are site of RNA and protein synthesis. These chromosomes show distinct dark and light bands. Euchromatin is present in dark bands and heterochromatin is present in light bands. These bands help in mapping of chromosomes in cytogenetic studies. These chromosomes form puffs or loops (in region of dark bands) which are called Balbiani puffs or Balbiani rings where synthesis of mRNA occurs.

Correct option: B
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Question 89
A
passive transport is nonselective
B
passive transport is along the concentration gradient while active transport is due to metabolic energy
C
active transport is more rapid
D
passive transport is confined to anions while active transport in confined to cations.
Explanation
Active and passive transports across cell membrane differ in passive transport is due to metabolic energy. There is always expenditure of energy in active transport.

Correct option: B
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Question 90
A
lysosomes
B
plastids
C
grana of chloroplasts
D
cell plates after cell division in plants.
Explanation
The Golgi apparatus is present in all eukaryotic cells. It is specially extensive in the secretory cells. It is a central stack (pile) of parallel, flattened, intercommunicating sacs or cisternae and many peripheral tubules and vesicles. <br /> The two poles of a Golgi apparatus are called cis face and Trans face, which act respectively as the receiving and shipping departments. The vesicles lie near the ends and concave surface of the Golgi complex. <br /> They are pinched off from the tubules of the cisternae. They are of two types: smooth or secretory vesicles, which have a smooth surface and contain secretions of the cell; and coated vesicles that have rough surface and elaborate membrane proteins. They carry materials to or from the cisternae. The Golgi complex gives rise to primary lysosomes by budding from the Trans face of cisternae.

Correct option: A

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