101. Which among the following are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survive without oxygen?

(1) Bacillus

(2) Pseudomonas

(3) Mycoplasma

(4) Nostoc

Answer (3)

Sol. Mycoplasmas are smallest, wall-less prokaryotes, pleomorphic in nature. These are pathogenic on both plants and animals.

102. Which of the following options gives the correct sequence of events during mitosis?

(1) Condensation —> nuclear membrane disassembly —> crossing over —> segregation —> telophase

(2) Condensation nuclear membrane disassembly —> arrangement at equator -3 centromere division —> segregation —> telophase

(3) Condensation —> crossing over –> nuclear membrane disassembly —> segregation —> telophase

(4) Condensation —> arrangement at equator —> centromere division —> segregation —> telophase

Answer (2)

Sol. The correct sequence of events during mitosis would be as follows

(i) Condensation of DNA so that chromosomes become visible occurs during early to mid-prophase.

(ii) N uclear membrane disassembly begins at late prophase or transition to metaphase.

(iii) Arrangement of chromosomes at equator occurs during metaphase, called congression.

(iv) Centromere division or splitting occurs during anaphase forming daughter chromosomes.

(v) Segregation also occurs during anaphase as daughter chromosomes separate and move to opposite poles.

(vi) Telophase leads to formation of two daughter nuclei.

103. Which one of the following statements is correct , with reference to enzymes?

(1) Apoenzyme = Holoenzyme + Coenzyme

(2) Holoenzyme = Apoenzyme + Coenzyme

(3) Coenzyme = Apoenzyme + Holoenzyme

(4) Holoenzyme = Coenzyme + Cofactor

Answer (2)

Sol. Holoenzyme is conjugated enzyme in which protein part is apoenzyme while non-protein is cofactor. Coenzyme are also organic compounds but their association with apoenzyme is only transient and serve as cofactors.

104. During DNA replication, Okazaki fragments are used to elongate

(1) The leading strand towards replication fork

(2) The lagging strand towards replication fork

(3) The leading strand away from replication fork

(4) The lagging strand away from the replication fork

Answer (4)

Sol. Two DNA polymerase molecules work simultaneous at the DNA fork, one on the leading strand and the other on the lagging strand.

Each Okazaki fragment is synthesized by DNA polymerase at lagging strand in 5 ‘ —> 3’ direction. New Okazaki fragments appear as the replication fork opens further.

As the first Okazaki fragment appears away from the replication fork, the direction of elongation would be away from replication fork.

105. Which of the following are not polymeric?

(1)  Nucleic acids

(2)  Proteins

(3)  Polysaccharides

(4)  Lipids

Answer (4)

Sol. – Nucleic acids are polymers of nucleotides

– Proteins are polymers of amino acids

– Polysaccharides are polymers of monosaccharides

– Lipids are the esters of fatty acids and alcohol

106. The region of Biosphere Reserve which is legally protected and where no human activity is allowed is known as

(1) Core zone

(2) Buffer zone

(3) Transition zone

(4) Restoration zone

Answer (1)

Sol. Biosphere reserve is protected area with multipurpose activities.

It has three zones

(a) Core zone – without any human interference

(b) Buffer zone – with limited human activity

(c) Transition zone – human settlement, grazing cultivation etc., are allowed.

107. A dioecious flowering plant prevents both:

(1) Autogamy and xenogamy

(2) Autogamy and geitonogamy

(3) Geitonogamy and xenogamy

(4) Cleistogamy and xenogamy

Answer (2)

Sol. When unisexual male and female flowers are present on different plants the condition is called dioecious and it prevents both autogamy and geitonogamy.

108. A tempo rary endocrine gland in the human body is

(1) Pineal gland

(2) Corpus cardiacum

(3) Corpus luteum

(4) Corpus allatum

Answer (3)

Sol. Corpus luteum is the temporary endocrine structure formed in the ovary after ovulation. It is responsible for the release of the hormones like progesterone, oestrogen etc.

109. Match the following sexually transmitted diseases (Column – I) with their causative agent (Column – II) and select the correct option.

Answer (1)

Sol. Gonorrhoea – Neisseria (Bacteria) Syphilis – Treponema (Bacteria) Genital Warts – Human papilloma virus (Virus) AIDS – HIV (Virus)

110. Transplantation of tissues/organs fails often due to non-acceptance by the patients body. Which type of immune-response is responsible for such rejections?

(1) Autoimmune response

(2) Cell-mediated immune response

(3) Hormonal immune response

(4) Physiological immune response

Answer (2)

Sol. Non-acceptance or rejection of graft or transplanted tissues/organs is due to cell mediated immune response.

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