NET, IAS, State-SET (KSET, WBSET, MPSET, etc.), GATE, CUET, Olympiads etc.: Zoology MCQs (Practice_Test 100 of 112)
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- Assertion (A) : Parthenogenetically developed individual is haploid in nature.
- Reason (R) : It develops from an egg without fertilization.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true but R is NOT the correct explanation of A
- A is true but R is false
- A is false but R is true
- Assertion (A) : The metamorphosis in Ascidian tadpole is considered retrogressive.
- Reason (R) : In the process of metamorphosis gill openings are lost.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true but R is NOT the correct explanation of A
- A is true but R is false
- A is false but R is true
- Assertion (A) : When a beneficial mutation takes place it will always appear with increasing frequency in the next generation.
- Reason (R) : Gene mutation is a chemical change in a single gene.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true but R is NOT the correct explanation of A
- A is true but R is false
- A is false but R is true
- Danielli and Davson proposed a model for arrangement of
- DNA and histones in chromatin
- RNA and proteins in ribosomes
- lipids and proteins in cell membrane
- enzymes and coenzymes in mitochondria
- Which one of the following aspects of image formation is affected by the wavelength of illumination in the optical microscope?
- Resolution
- Magnification
- Contrast
- Clarity
- The smallest measuring unit in Cytology is
- millimeter
- millirnicron
- angstrom
- electron
- Microvilli are specialized components of
- nuclear envelope
- endoplasmic reticulum
- intercellular cementing substance
- plasma membrance
- Which one of the following mechanisms is involved in muscle contraction?
- Induction of Ca2 + activated ATP ase
- Polarization of cell membrane
- Transfer of electrons to NADH by ferrodoxin
- Formation of cyclic AMP by adenyl cyclase
- Which one of the following organelles is rich in acid phoshatases?
- Lysosomes
- Golgi complex
- Rough endoplasmic reticulum
- Nucleolus
- The specific enzyme marker of the outer membrance of mitochondria is
- succinate dehydrogenase
- ATP synthetase
- monoamine oxidase
- malate dehydrogenase
- Epinephrine is secreted by the cells. Of
- anterior pituitary
- adrenal
- thyroid
- gonads
- One of the major events associated with amoeboid locomotion is
- actin polymerization
- activation of acetylcholinesterase
- chromosome condensation
- microfilament disruption
- Polysomes are many
- ribosomes attached to an individual messenger RNA
- nucleosomes forming the chromatin structure
- lysosomes fusing during phagocytosis
- centrosomes clustering during mitotic division
- An electrochemical proton gradient occurs membrances of
- golgi cisternae
- nuclear envelope
- mitochondria
- lysosomes
- In cytosol, stacks of curved cisternae with associated tubules and secretory vesicles are identified as
- centrioles
- golgi complex
- smooth endoplasmic reticulum
- endosomes