Biology - Online Test
Q1. Which one of the following techniques made it possible to genetically engineer living organisms?
Answer : Option B
Explaination / Solution:
Recombinant DNA technology, joining together of DNA molecules from two different species that are inserted into a host organism to produce new genetic combinations that are of value to science, medicine, agriculture, and industry.
This technique made it possible to genetically engineer the genome of living organisms.
It involves a number of procedures like identification, separation, cloning and introducing into suitable vector.
Q2. In human beings, fertilization of egg takes place in
Answer : Option D
Explaination / Solution:
Fertilisation of egg in human female takes place in oviduct or fallopian tube at the junction of ampullar-isthamus. Fertilized egg travels towards the uterus after that.
Q3. Hardy-Weinberg principle states that allele frequencies in a population are stable and is
Answer : Option D
Explaination / Solution:
The Hardy–Weinberg principle, also known as the Hardy–Weinberg equilibrium, model, theorem, or law, states that allele and genotype frequencies in a population will remain constant from generation to generation in the absence of other evolutionary influences.
Q4. The emergency contraceptives used to avoid possible pregnancy due to rape or unprotected intercourse is
Answer : Option A
Explaination / Solution:
The emergency contraceptives used to avoid possible pregnancy due to rape or unprotected sexual intercourse is a combination of progestogen and estrogen within 72 hours of sexual intercourse.
Q5. The methods involved in HGP have two major approaches, one approach focused on identifying all the genes that expressed as RNA called as Expressed sequence tags the other one is
Answer : Option D
Explaination / Solution:
The Human Genome Project (HGP) involved two major approaches; one approach called as Expressed sequence tags the other one is called sequence annotation.
DNA annotation or genome annotation is the process of
- (a) identifying the locations/segments of genes, coding regions and other specific locations that are of imporatance in a DNA sequence or genome and
- (b) associating relevant information with those locations/segments (e.g. determining what the identified genes do).
Q6. Cessation of menstrual cycle in female in female is known as
Answer : Option A
Explaination / Solution:
In female, menstrual cycle stops at about 50 years of age. This is called menopause. It is controlled by hormone released by ovum.
Q7. Which one is used for knowing whether or not a population is evolving?
Answer : Option D
Explaination / Solution:
Hardy-Weinberg equation is used to knowing whether or not a population is evolving or not. This equation is represented as
In the equation, p2 represents the frequency of the homozygous genotype AA, q2 represents the frequency of the homozygous genotype aa, and 2pq represents the frequency of the heterozygous genotype Aa.
Q8.
Assertion: The surgical procedure in man to block gametes transport to prevent conception is called tubectomy.
Reason: Tubectomy is cutting and tieding of fallopian tube to prevent release of ovum.
Answer : Option D
Explaination / Solution:
The surgical procedure in man to block gametes transport to prevent conception is called vescetomy as vas deference is cut and tied. Tubectomy is cutting and tieding of fallopian tube to prevent release of ovum from ovary.
Q9. The genetic and physical maps on genome was generated using information on
Answer : Option A
Explaination / Solution:
The sequence of chromosome 1 was completed only in May 2006 (this was the last of the 24 human chromosomes – 22 autosomes and X and Y – to be sequenced).
The challenging task was assigning the genetic and physical maps on the genome. This was generated using information on polymorphism of restriction endonuclease recognition sites, and some repetitive DNA sequences known as microsatellites.
Q10. Two hormones that regulate the menstrual cycle are
Answer : Option A
Explaination / Solution:
Menstrual cycle is controlled by two hormones estrogen and progesterone. Level of estrogen hormone increase sharply during ovulation and progesterone level increase during secretory phase.
