CSIR NET Life Sciences Mock Test - 10 - CSIR NET Life Science MCQ

Given:

Marks in 7 subjects = 90, 66, 70, 82, 86, 78, 74

Mean

Median term when, n is odd

Median term term }, when n is even

Mode = The mode is the value that appears most frequently in a data set.

Arrange the given data in ascending order and then use the median formula.

Mean

Median th term = 78

∴ 78 is both median and mean.

Let the total capital invested be x and the months, for which Kalpesh's amount was invested, be m.

We know that,

Profit = Amount invested × Time  

∴ Ratio of profit will be in proportion to the amount and time invested.

Profit here is distributed equally.

∴ Kalpesh invested his capital for 15 months.

Two people are required to shake hands.

The total number of handshakes is 66.

Suppose there are n people in the room

The total number of persons in the room is ⁿC₂ = 66

⇒ n (n - 1) = 132
⇒ n² -  n - 132 = 0
⇒ (n - 12)(n + 11) = 0
⇒ n = 12 or n = - 11
Here n = - 11 is not possible as the number of persons can't be negative.
⇒ n = 12
∴ The number of people in the room is 12.

Calculate the hypotenuse by using Pythagoras theorem

Therefore,

The logic followed here is as follows:

Similarly,

So, ‘NAUGHTY’ will be written as UANGYTH in that language.

Given:

Putting the value of a and b

On dividing 300 by 9, we get : 300 = 9 × 33 + 3

Thus, the smallest number which should be subtracted from 300 = 3

Also, 300 - 3 = 297 is completely divisible by 9.

Complex barrier does not come under innate immunity.

Innate immunity includes Physical barrier, Physiological barrier, Cellular barrier and Cytokine barrier.

Those organs which include hearing, seeing, taste and smell are known as sensory organs. 

Sense organs are the specialized organs composed of sensory neurons, which help us to perceive and respond to our surroundings. There are five sense organs – eyes, ears, nose, tongue, and skin.

N1  nitrogen of adenosine gets protonated if the pH of the nucleoside is lowered from 7 to 3.

In aqueous solution, adenine and adenosine prefer to be protonated at N-1, as unequivocally established by 1H-NMR studies. In the gas phase, adenine is protonated at one of the basic nitrogen atoms, and the composition of the tautomer mixture depends on the reaction conditions.

pKa of a - amino group is lower than the pKa of E - amino group describes the pKa of amino groups in proteins.

The pKa value given for the amino group on any amino acid specifically refers to the equilibrium between the protonated positive nitrogen and deprotonated neutral nitrogen.

The intermediate developmental stage in the ecological succession is called Sere.

A seral community is an intermediate development stage found in an ecosystem proceeding towards its climax. In many cases, more than one seral stage evolves until climax conditions are achieved.

Ecesis is the process of the establishment of the species in a new area. It means the ability of some migrating plant or animal species, having arrived at a new site to germinate, grow and reproduce successfully. A climax community is the final stage of succession.

Succession initiates with the development of a barren area without any form of life is called nudation succession.

Embryo culture is the technique of taking out young/fragile/dormant embryos from developing seeds and their growth on a culture medium to form seedlings and then young plants. This technique is useful in the multiplication of some rare plants, e.g., Makapuno Nut.

The sporogonium is where the spore mother cells are made. These are diploid (2n) and represent the sporophyte generation's last stage. The spore mother cells undergo reduction division (meiosis), resulting in the formation of tetrads of haploid (n) spores. The spores mark the start of the gametophyte generation.

Cellular respiration is the process of the breakdown of food in the cell with the release of energy. It takes place in the cells of all organisms. The food is broken down into carbon dioxide and water using oxygen. Breakdown of glucose occurs with the help of oxygen it is called aerobic respiration. The breakdown of glucose that occurs without the help of oxygen is called anaerobic respiration.

Organisms such as yeast can survive in the absence of air through anaerobic respiration.

• In anaerobic respiration, glucose breaks down into alcohol and carbon dioxide.
• In anaerobic respiration, if yeast is added to fruit juices, the sugar gets converted to alcohol.
• Yeasts are single-celled organisms.
• This is why yeasts are used to make wine and beer.

900 mitochondrial proteins are encoded in nuclear genes and imported into mitochondria after their synthesis. 

In rainy season, door gets swelled due to the phenomenon of imbibition. It is the process of absorption of water without forming a solution.

Genome size of E.coli/Genome size of unknown=Cot ½ of E.coli/Cot½ of unknown
4 X 106 bp / x = 4/283
x = 4 X 106 bp X 283/ 4
x = 283 X 106 bp
x = 2.83 X 108 bp

Science that deals with the relationships between living organisms with their physical environment and with each other is called Ecology.

• Ecology is the science that deals with the relationships between living organisms with their physical environment and with each other.
• The term “ecology” was coined by the German zoologist, Ernst Haeckel, in 1866 to describe the “economies” of living forms.
• Ecology can be approached from the viewpoints of 

1. ​The environment and the demands it places on the organisms in it or
2. Organisms and how they adapt to their environmental conditions.

• An ecosystem consists of an assembly of mutually interacting organisms and their environment in which materials are interchanged in a largely cyclical manner. 

The epidermis and root cap are produced by dermatogen. The protoderm forms periblem, plerom, and dermatogen.

Bacteriophage was discovered by F. W. Twort and Felix d'Herelle independently.

Virology started when two bacteriologists, Frederick William Twort in 1915 and Félix d'Hérelle in 1917, freely found the presence of bacteriophages (viruses that infect bacteria). Félix d'Hérelle had coined the word 'bacteriophage' which literally means "bacteria eater".

Bacteriophages, commonly known as phages, are viruses that infect and reproduce in bacterial cells. They are omnipresent within the environment and are recognized as the foremost inexhaustible organic specialist on soil. They are amazingly different in the size, morphology, and genomic organization.

Hekistotherm is found in very low temperatures mainly alpine vegetation is dominant in this region. Microtherm is the low temperature where coniferous vegetation is found in dominance.

Marsupials are the mammal of an order whose members are born incompletely developed and are typically carried and suckled in a pouch on the mother's belly. The distinctive characteristic of 'Marsupials' is that they carry their young ones in pouches. They take their name Marsupials from the word 'Marsupium' means pouch which protects eggs, offspring, or reproductive structures. The main examples of Marsupials animals are kangaroos, wallabies, koalas, possums, opossums, wombats, and Tasmanian devils.

For a chemical reaction to be spontaneous, it should have negative value of the Gibbs free energy change ΔG.

Consider following chemical reactions:

If the magnitude of for second reaction is greater than the magnitude of for first reaction, , then if we add the reactions (1) and (2), the value for the coupled reaction will be negative. Due to this, the coupled reaction would be spontaneous.

Proto-oncogenes are the genes present in cells themselves, these genes have the ability to avert a normal cell into a cancerous one. The initial event that led to the discovery of proto-oncogenes was made in 1976 when src gene from avian sarcoma virus was identified.

The basilar membrane within cochlea of inner ear is a stiff structural element that separates two liquid filled tubes that run along the coil of cochlea. Basilar membrane is thickened to form the organ of Corti.

Deinococcus radiodurans is a radiation-resistant extremophile bacterium that is genetically engineered for the bioremediation of solvents and heavy metals.

• An engineered strain of Deinococcus radiodurans has been shown to degrade ionic mercury and toluene in radioactive mixed waste environments.
• Dechloromonas aromatica is a rod-shaped bacterium that can oxidize aromatics including benzoate, chlorobenzoate, and toluene, coupling the reaction with the reduction of oxygen, chlorate, or nitrate.

The removal of one or more bases from the nucleotide chain is also known as deletion. Deletion is a type of frame-shift mutation. If we add one or more bases in a nucleotide chain, then it is called insertion.

Proto-oncogenes are normal cellular genes that regulate cell growth and differentiation. They often encode products such as growth factors and their receptors, cell cycle regulators, DNA-binding proteins, transcription factors, protein kinases involved in signal transduction, and others.

Out-breeding is the breeding of unrelated animals which may be between individuals of the same breed but having no common ancestors for 4-6 generations or different breeds or different species.