CSIR NET Life Sciences Mock Test - 6 - UGC NET MCQ

Given:

There is a digit at the 10th place of 6n.

Where n is a natural number that is greater than 1.

Calculation:

Let be n= 2, ,3, 4, 5,...

⇒ 6 × 2 = 12 = 1

⇒ 6 × 3 = 18 = 1

⇒ 6 × 4 = 24 = 2

⇒ 6 × 5 = 30 = 3

⇒ 6 × 6 = 36 = 3

⇒ 6 × 7 = 42 = 4

⇒ 6 × 8 = 48 = 4

⇒ 6 × 9 = 54 = 5

∴ It can be 1, 2, 3, 4, 5.

Simple interest, Principle amount, Rate, Time

Let the principal amount

And simple interest

We know,

Given:

A fair had an entry fee of Rs. 1000.

It got reduced by 25% which in turn increased the total amount received by 20%.

Calculation:

The fee is Rs 1000.

The original number of visitors = 1000

New number of visitors

Increase

According to the given information:

From the above figure, the theatre is in the South-West direction from Mohan’s starting point.

Given:

Students from the physics department from college A = 50
Students from the math department from college A  = 65
Students from chemistry department from college C = 70
Students from the math department from college C = 85
Total number of students from physics and math department from college A  = (50 + 65) = 115
Total number of students from chemistry and math department from college C = (70 + 85) = 155
Now, the ratio between them  = 115 : 155
= 23 : 31
∴ The ratio between them is 23 : 31.

Given:

Number of students from chemistry department from college B = 95

Number of students from chemistry department from college C = 70

Number of students from physics department from college A = 50

Number of students from physics department from college D = 60
Total students from chemistry department from both college B and college C
Total students from the physics department from both colleges A and college D
So, the difference between the students from two departments
∴ The difference between the total number of students from the chemistry department from college B and college C and the total number of students from the physics department from college A and college D is 55.

Given:
The number of coins tossed is 5 coins.

Formula used:

The number of ways for obtaining three heads from five trials
Total number of outcomes from the trial of five coins  = 2⁵ = 32
The required probability = 10/32 = 5/16

∴ The probability of exactly 3 heads is 5/16.

Invalid votes = 20% of the total votes

Arvind won by 480 votes.

And Arvind got 20% more votes than Manoj.

Let total votes be x.

Invalid votes = 20% of x = 0.2x

Valid votes = x – 0.2x = 0.8x

Arvind and Manoj gets 0.8x votes.

Arvind got 20% more votes than Manoj.

⇒ Arvind gets 60% of valid votes and Manoj gets 40% of valid votes.

⇒ Votes received by Arvind  = 0.48x

⇒ Votes received by Manoj = 0.8x – 0.48x = 0.32x

Votes of Arvind – Votes of Manoj = 480

⇒ 0.48x – 0.32x = 480 ⇒ x = 3000

Given,

The more the distance between the gene on chromosomes, then gene shows weak linkage and follow crossing over to form new combination of genetic material and the less the distance between the genes the greater the linkage.

A Vulnerable species is a species of animals or plants which are likely to become endangered unless something changes. The Greater One-Horned Rhinoceros are listed as one of the vulnerable species by the International Union for Conservation of Nature. Poaching of horns is an important reason for the decline in the number.

The primary carbon dioxide acceptor in the Hatch and Slack pathway is PEP or phosphoenol pyruvate. PEP is present in the mesophyll cells. Phosphoenol pyruvate is a 3-carbon molecule. The carboxylation takes place with the help of an enzyme called PEP carboxylase. They yield a 4-C molecule called oxaloacetic acid (OAA).

Increasing species diversity affect ecosystem because It increase the efficiency and productivity of an ecosystem. 

By increasing species diversity in an ecosystem, both the efficiency and the productivity of an ecosystem will increase. A greater species richness and diversity may cause ecosystems to function more efficiently and productively by making more resources available for other species. 

In genetics, a single-nucleotide polymorphism is a germline substitution of a single nucleotide at a specific position in the genome. Although certain definitions require the substitution to be present in a sufficiently large fraction of the population (e.g. 1% or more), many publications do not apply such a frequency threshold.

For example, at a specific base position in the human genome, the G nucleotide may appear in most individuals, but in a minority of individuals, the position is occupied by an A. This means that there is an SNP at this specific position, and the two possible nucleotide variations – G or A – are said to be the alleles for this specific position.

An SSLP is a type of polymorphism: a difference in DNA sequence between individuals. SSLPs are repeated sequences over varying base lengths in intergenic regions of DNA.

In molecular biology, restriction fragment length polymorphism (RFLP) is a technique that exploits variations in homologous DNA sequences, known as polymorphisms, in order to distinguish individuals, populations, or species or to pinpoint the locations of genes within a sequence.

Amplified fragment length polymorphism (AFLP) is a PCR-based technique that uses selective amplification of a subset of digested DNA fragments to generate and compare unique fingerprints for genomes of interest.

GnRH is a Gonadotropin-Releasing Hormone, which is responsible for the release of follicle-stimulating hormone (FSH) and luteinizing hormone (LH).

DNA is a linear molecule made up of four different types of nucleotide bases: adenine (A), cytosine (C), guanine (G), and thymine (T) (T). The DNA sequence is the order in which these bases appear. Human DNA consists of about 3 billion bases, and more than 99 percent of those bases are the same in all people.

Diffusion is a passive process and it doesn’t require energy in the form of ATP. Temperature, Pressure and Concentration gradient do affect the rate of diffusion to varying degrees.

Diffusion is a result of the random movement of particles, hence there is a gross flow of matter from an area of higher concentration to an area of lower concentration. A good example of this is the dispersing of air particles by perfume is sprayed, permeating the still air of a room.

Photoperiodic adjustments are performed by hypothalamic amines, gonadotropin-releasing hormone, and beta-endorphins.

Shikimic acid pathway is related to secondary metabolite synthesis of phenolic compounds like coumarins,Flavanoids. eg: of phenolics are Aflatoxins B1,scopoletin.

Ribonucleic acid (RNA) is a linear molecule made up of four different ribonucleotide bases: adenine (A), cytosine (C), guanine (G), and uracil (U).

Aruna of castor is a crop variety which is not due to induced mutations. Aruna variety has been developed by mutation, where maturity period has been reduced from normal 270 days to 102 days.

Early detection of a disease is possible by PCR and Gene therapy.

For effective treatment of a disease, early diagnosis and understanding its pathophysiology is very important. Using conventional methods of diagnosis (serum and urine analysis, etc.) early detection is not possible. Recombinant DNA technology, Polymerase Chain Reaction (PCR) and Enzyme Linked Immuno-sorbent Assay (ELISA) are some of the techniques that serve the purpose of early diagnosis.

Eicosanoids are non-polar, 20-carbon containing molecules derived from the fatty acid, arachidonic acid. Eicosanoids regulate processes like blood pressure, inflammation, blood clotting. Several over-the-counter drugs used to treat headaches inhibit eicosanoid synthesis.

The substage condenser lens gathers the diffuse rays from light source and illuminates the specimen by formation of a small cone of bright light. With the help of condenser lens very small parts of the specimen can be seen after magnification.

Combinations of ultimate hypotheses best explain the bee's feeding behavior: In the past, those individuals that fed on nectar and pollen left more descendants than those who preferred either nectar or pollen. The ancestors of the honey bee were dependent on some sugar and protein-rich diet and the honey bees have inherited the same taste perception. That’s why western honey bee feeds on flowers to collect both pollen and nectar to form honey which is a rich source of sugar and protein.

In directional selection one extreme is more favoured.

The “tail” of the histone is not required for the association for the DNA with the histone octamer into a nucleosome. This is proved when the nucleosome is treated with the protease, trypsin. Trypsin is known to cleave proteins after positively charged amino acid thus, when the N – terminal tail is removed no structural variation is observable in the nucleosome.

The inactive conformation of the G-protein coupled receptor is stabilized by non-covalent interactions between the residues in the transmembrane alpha helices. Rotation or movements in these loops cause changes in the conformation of cytoplasmic loops.

There are different types of sex determination techniques. One of them is the XX-XY type of determination as in humans. Another is the ZZ-ZW type of sex determination. It has seen in birds.

In this type, males are homogametic ZZ, having two similar sex chromosomes. Females are heterogametic ZW, So, in birds, the sex of the offsprings depends on the type of female sex chromosome that is fertilized by men.

So, both assertion and reason statements are correct.