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Dehydration synthesis is not involved in:
1. joining monosaccharides to form a polysaccharide
2. base pairing in a double-stranded DNA
3. linking of fatty acid molecules to glycerol
4. joining of amino acids to form a peptide

Perisperm differs from endosperm in:

An example of a seed with endosperm perisperm and caruncle is:

Through which cell of the embryo sac, does the pollen tube enter the embryo sac-

The spliceosome is composed of :
1. RNA and DNA.
2. Protein and DNA.
3. RNA and protein.
4. Lipids and monosaccharides

Which of the following is true for both transcription and DNA replication?

Male gametes in angiosperms are formed by the division of:

In some viruses, DNA is synthesised by using RNA as a template. Such a DNA is called:

What would be the number of chromosomes of the aleurone cells of a plant with 42 chromosomes in its root tip cells?

Adventive embryony in citrus is due to:

The first genetic map of a chromosome was constructed by:

A deoxyribonucleotide contains:

Male gametophyte with the least number of cells is present in:

A plant, on repeated self-pollination, preserves the trait expressed for many generations. Such a plant is said to be:

The first genetic code of life was based on:

Long filamentous threads protruding at the end of a young cob of maize are:

The recombination frequency between genes A and B is 9 percent, between A and C is 17 percent, and between B and C is 26 percent. What is the sequence of genes on the chromosome?

Even in the absence of pollinating agents, seed-setting is assured in:

Lagging strand is replicated in a discontinuous manner in small Okazaki fragments because:

Almost all pollens, that are allergens, are from:

What event during meiosis is most likely to cause a change in the number of chromosomes like trisomies and monosomies in progeny?
1. an independent assortment of chromosomes
2. allele segregation
3. non-disjunction
4. recombination

The mRNA codon GUG codes for:

The analysis of viral nucleic acid reveals that it contains adenine 21%, guanine 31%, cytosine 23%, and some unexpected base 19%. What will be true for this virus?

Charging of tRNA molecules is catalyzed by the enzyme:
1. Polynucleotide phosphorylase
2. RNA polymerase III
3. Aminoacyl tRNA synthetase
4. Peptidyl transferase

The best evidence for tracing phylogeny amongst a group of organisms will be similarities in their:

Match the scientists listed under Column ‘I’ with ideas listed in Column ‘II’.

Which of the following would be diploid in an angiosperm?
1. Cells of the pollen tetrad
2. Tube nucleus of the pollen tube
3. Functional megaspore
4. Megaspore mother cell

The type of natural selection where more individuals acquire value other than the mean character value is known as:

Winged pollen grains are present in:

“Chromosomes, which are seen in all dividing cells and pass from one generation to the next, are the basis for all genetic inheritance”.
This statement is credited to:

The arrangement of nuclei in a normal dicot embryo sac is:

A mutation leading to the formation of a nonfunctional sigma subunit of RNA polymerase holoenzyme in prokaryotes will result in bacteria being unable to:
1. assemble RNA polymerase onto the DNA strand.
2. identify and tightly bind promoter elements.
3. convert a closed complex to an open complex.
4. synthesize RNA once an open complex is formed.

The physical basis of independent assortment is explained by which of the following stages of meiosis?

The term that describes ‘differential reproduction’ in Darwinian terms will be:

Hargobind Khorana was awarded the noble prize for:
1. discovering DNA
2. discovering RNA
3. discovering DNA polymerase
4. chemical synthesis of a gene

If there are two forms of a specific enzyme in a population, and if the relative frequencies of the individuals possessing each form of the enzyme changes, then certainly there is:

The plant parts which consist of two generations, one within the other, are:
(a) Pollen grains inside the anther
(b) Germinated pollen grain with two male gametes
(c) Seed inside the fruit
(d) Embryo sac inside the ovule

What must be true for a transfer RNA molecule?

In the F₂ generation of a Mendelian dihybrid cross, the number of phenotypes and genotypes are:
1. phenotypes - 4; genotypes - 16
2. phenotypes - 9; genotypes - 4
3. phenotypes - 4; genotypes - 8
4. phenotypes - 4; genotypes – 9

Consider the two statements:

 
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. Both I and II are incorrect

The fact that a purine base always pairs through hydrogen bonds with a pyrimidine base in the DNA double helix leads to:
1. the antiparallel nature
2. the semiconservative nature
3. uniform width throughout DNA
4. uniform length in all DNA

The inheritance of genes finds a parallel with the behavior of chromosomes, especially during cell division for gamete formation. Such parallels include:

All the following are required for accurate transcription except:
1. Regulatory information within the DNA.
2. Proteins which bind to the DNA.
3. Proteins that copy the information from the DNA.
4. Ori.

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

The untranslated regions [UTR] in mRNA:

Two individual plants heterozygous at two unlinked loci are crossed. What proportion of progeny is expected to be homozygous recessive at least at one of the loci?

When compared with the maternal contribution to the genetic constitution of the embryo, the maternal contribution to the endosperm in angiosperms is:

Coelocanth called lobefins evolved into the first:

During a menstrual cycle, the part of the female reproductive system that undergoes the greatest changes is the:

What happens to the corpus luteum if fertilization does not take place?

The menstrual cycle is seen in the females of all the following except:

Chose the correct chronological order of the male duct system beginning from the seminiferous tubules:

One of the legal methods of birth control is:

At the time of the origin of life, the primeval earth's atmosphere most likely did not have significant amounts of:

In the luteal phase, the secretion of progesterone levels results in:

Which substance can be used as a male contraceptive in the future:

A chromosomal disorder caused by a primary autosomal non-disjunction is:
1. Klinefelter's syndrome
2. Turner's syndrome
3. Down's syndrome
4. Conn's syndrome

Identify the incorrectly matched pair:

The primary mechanism of action of copper IUDs is that they prevent:

The two strains, R and S, of the bacterium Streptococcus pneumoniae, differ as:

Ectopic pregnancies are referred to as?

The length of DNA in a typical mammalian cell is approximately:
1. 1.1 meter
2. 1.5 meter
3. 2.2 meter
4. 3.3 meter

Spermatogenesis and oogenesis in humans differ in all the following except:
1. The timing of the beginning of the process
2. The number of gametes produced per meiocyte
3. The ploidy of the resultant gametes
4. The amount of cytoplasm in the resultant gametes

Female secondary sexual characteristics develop in response to:
1. estrogen
2. progesterone
3. androgen
4. luteinizing hormone

To induce uterine contractions for parturition, which of the following hormones can be injected into the female?

Surgical interventions like tubectomy and vasectomy block:

Speciation of Darwin finches on Galapagos islands is a prototypical example of:

In cases of Phenylketonuria:

Members belonging to the same biological species are potentially able to:
1. compete with members of other species only
2. express all the same genes in all their cells
3. breed with members of other biological species
4. interbreed and produce fertile offspring

The onset of puberty in humans coincides with a significant increase in the secretion of:

ZZ / ZW type of sex determination is seen in:

What is incorrect for Hemophilia?

Plica semilunaris on the inside corner of the eye and, muscles in the pinna are:

The mRNA codon for which there will be no cognate-charged tRNA molecule is:

Artificial insemination means:

The correct chronology in the ovarian cycle in a non-pregnant woman would be:

The first movements of the foetus and the appearance of hair on the head are usually observed during the:
1. the first month of pregnancy
2. the second month of pregnancy
3. the fifth month of pregnancy
4. the sixth month of pregnancy

An individual affected by Klinefelter’s syndrome:

If pregnancy is established, the corpus luteum:

Both Hepatitis B and HIV infections:
1. are completely curable STIs
2. are caused by bacterial pathogens
3. can be transmitted by sharing injection needles
4. are preventable by vaccination

The way lac operon is regulated by regulatory gene and the substrate means that it should be classified as a:
1. negative repressible operon
2. negative inducible operon
3. positive inducible operon
4. positive repressible operon

The mode of inheritance of the trait in the given pedigree is most likely [affected individuals are shown by solid symbols]:

1. Autosomal recessive 2. Sex-linked recessive 3. Sex-linked dominant 4. Autosomal dominant

'Living about 1.5 mya, with a brain size of about 900 cc, probably ate meat' – the description applies to:

The first organism whose genome was sequenced was:
1. Haemophilus influenzae.
2. Escherichia coli.
3. Arabidopsis thaliana.
4. Saccharomyces cerevisiae.

The hormones that attain a peak level in the middle of the menstrual cycle include:

Inhibin is a hormone that:

Identify the incorrect statement regarding the comparison of an RNA and a DNA molecule:

The most critical period of gestation where the fetus is most vulnerable to genetic birth defects from drugs taken by the mother is:
1. last trimester
2. third to sixth month
3. first trimester
4. a week prior to parturition

A pure line, red-eyed female fruit fly is crossed to a white-eyed male fruit fly. The percentage of the male offspring with white eyes is expected to be: [white eyes are X-linked, recessive]

The functions of male sex accessory ducts and glands are maintained directly by:
1. GnRH
2. Gonadotropins
3. Testicular androgens
4. Adrenal medullary androgens

Normally the process of DNA fingerprinting does not involve:
1. Southern blot
2. Elution
3. Radiolabelled VNTR probes
4. Autoradiography

Just before the endometrium is shed during menstruation:
1. blood levels of estrogen and progesterone decrease.
2. blood levels of estrogen and progesterone increase.
3. the corpus luteum gets fully developed.
4. ovulation occurs.

Human skin color is controlled by three polygenes A, B, and C. What proportion of the progeny from a cross between two individuals with intermediate skin color will also have intermediate skin color?

Hardy-Weinberg equilibrium is itself least likely to be influenced by: