BIO 101 | Study Mode

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Question 51
A
observable characteristics of existing organisms 
B
the ancestral lineage of existing organisms 
C
dendogram based on DNA characteristics 
D
sexual characteristics. 
Explanation.
Phenetic classification is a type of numerical taxonomy. In this type of classification the organisms are arranged according to overall similarity of existing organisms based on available characters. <br /> It is also called adansonian taxonomy because the same was first attempted by Adanson (1763), of course on the basis of external traits only. Numerical taxonomy evolved around 1950. <br /> It has received impetus with the availability of calculating machines and computers. In numerical taxonomy as many characters as possible are employed for evaluating degree of similarity and difference. All characteristics used in analysis are given equal weightage and importance. <br /> A proper selection of characters, their organisation and analysis in the light of current knowledge is key to success of this method. A lot of subjectivity can creep in depending upon the judgement of the biosystematist. No weightage is given to the quantity of the character present.

Correct Option:
A
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Question 52
A
lysozymes 
B
lipolytic 
C
lytic 
D
lysogenic. 
Explanation.
Viruses like bacteriophage T4 undergo lytic cycle that involves lysis of bacteria. The replication cycle of bacteriophage T4 consists of following phases <br /> (i) Adsorption of the phage to bacterial or host cell. Then the viral genetic material penetrates into the host cell. <br /> (ii) Eclipse period involves the synthesis of new phage DNA and proteins. <br /> (iii) Maturation involves the assembly of phage DNA into the protein coat. <br /> (iv) Lysis of host cell occurs and releases infective progeny phases.

Correct Option:
C
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Question 53
A
DNA is not present at any stage in the life cycle of retroviruses 
B
Retroviruses carry gene for RNA-dependent DNA polymerase 
C
The genetic material in mature retroviruses is RNA 
D
Retroviruses are causative agents for certain kinds of cancer in man. 
Explanation.
Retroviruses contain RNA as genetic material and this RNA is converted to DNA using enzyme reverse transcriptase.

Correct Option:
A
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Question 54
A
they provide a beautiful area for recreation 
B
one can observe tropical plants there 
C
they allow ex-situ conservation of germ plasm 
D
they provide the natural habitat for wild life. 
Explanation.
Ex situ conservation means offsite conservation. It is the process of protecting endangered species of plants and animals by removing it from an unsafe or threatened habitat and placing it or part of it under the care of humans. Botanical gardens serve as ex situ conservation of germplasm of different plants, to maintain rare and endemic plant species and also to provide recreation and knowledge about plants to a comnian man.

Correct Option:
C
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Question 55
A
International Code of Botanical Nomenclature 
B
International Congress of Biological Names 
C
Indian Code of Botanical Nomenclature 
D
Indian Congress of Biological Names. 
Explanation.
The International Code of Botanical Nomenclature (ICBN) is a set of rules and recommendations dealing with the formal botanical names given to plant. The foundations of ICBN are given in book written by C. Linnaeus named Philosophia Botanica. It is independent of zoological nomenclature, ilie rank of species is basic and relative orders of the ranks of taxa are as: species, genus, tribe, family, order, series, class, division and kingdom. <br /> The different ranks or categories have following specific endings of their names as division phyla, class, and family-aceae.

Correct Option:
A
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Question 56
A
Physarum 
B
Thiobacillus 
C
Anabaena 
D
Rhizopus. 
Explanation.
Slime moulds are peculiar protista that normally take the form of amoebae, but under certain conditions develop fruiting bodies that release spores, superficially similar to the sporangia of fungi. <br /> The order physarales include Physarum species. The fruiting bodies (sporangia) are characterized by the presence of abundant amount of calcium salt. The order comprises 142 species which are placed under 12 genera. Physarum polycephalam is the best known. The somatic phase is multinucleate, diploid holocarpic Plasmodium which is the product of syngamy.

Correct Option:
A
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Question 57
A
phospholipids and oligosaccharides 
B
phospholipids and hemicellulose 
C
phospholipids and integral proteins 
D
phospholipids, extrinsic proteins and intrinsic proteins. 
Explanation.
According to find mosaic model, plasma membrane is composed of phospholipids, extrinsic proteins and intrinsic proteins. Chemically, the plasma membrane is made up of 60% proteins and 40% lipids. <br /> On the basis of their location, the membrane proteins can be put under two categories namely extrinsic (peripheral) and intrinsic (integral). The lipids of plasma membrane are of three types namely phospholipids, glycolipids and sterols.

Correct Option:
D
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Question 58
A
unicellular fungus 
B
multicellular fungus 
C
unicellular uninucleate green algae 
D
unicellular multinucleate green algae. 
Explanation.
Hammerlings experiment with the single celled green algae, Acetabularia, showed that the nucleus of a cell contains the genetic information that directs cellullar development.

Correct Option:
C
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Question 59
A
chromatography 
B
X-rays diffraction 
C
different centrifugation 
D
auto-radiography. 
Explanation.
Organelles can be separated from cell homogenate through differential centrifugation. The basic principle involved here is sedimentation of particles in a suspension by centrifugal force. In a centrifuge, the particles sediment at different rates when an accelerating force is subjected. The rate of sedimentation depends upon the size of the particles, its shape and density.

Correct Option:
C
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Question 60
A

proteins and carbohydrates

 
B

proteins and lipids

 
C

proteins, lipids and carbohydrates

 
D

proteins, some nucleic acid and lipids.

 
Explanation.

Plasma membrane is made up of protein, lipids and carbohydrates. Chemically, the plasma membrane is base up of 60% proteins and 40% lipids. The percentage of carbohydrates ranges from 1 -10 which are in the form of glycoproteins and glycolipids.


Correct Option:
C

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