300+ REAL TIME NEET Biology Objective Questions & Answers 2023

300+ TOP MCQs on Mitosis and Answers

NEET Biology is the vey important paper in the medical entrance exam. Here, you will discover the NEET Biology MCQs and Answers for all Concepts as per the latest syllabus. Practice more on a regular basis with these NEET Biology objective questions on air pollution . NEET Biology Mitosis Multiple Choice Questions

MCQs on Mitosis :

1. DNA synthesis takes place during_________ phase
(a) M phase
(b) G₂ phase
(c) G₁ phase
(d) S phase

Answer

Answer: (d)

2. Where does spindle fibres attach to during metaphase?
(a) kinetochore of the chromosome
(b) kinetosome of the chromosome
(c) centromere of the chromosome
(d) telomere of the chromosome

Answer

Answer: (a)

3. Nucleolus and endoplasmic reticulum start disappearing at
(a) late prophase
(b) early prophase
(c) late metaphase
(d) early metaphase

Answer

Answer: (b)

4. Early prophase of a diploid cell has_____ sets of chromosomes; telophase of a diploid cell has ____ sets of chromosomes
(a) 1;2
(b) 2;1
(c) 2;2
(d) 1;1

Answer

Answer: (c)

5. A protein complex, that links sister chromatids, is
(a) actin
(b) cohesin
(c) myosin
(d) actomyosin

Answer

Answer: (b)

6. Formation of cell plate starts at
(a) G₂ phase
(b) prophase
(c) telophase
(d) S phase

Answer

Answer: (c)

7. If you want to count the number of chromosomes, which is the best stage to do so?
(a) telophase
(b) interphase
(c) prophase
(d) metaphase

Answer

Answer: (d)

8. Mitotic anaphase and metaphase have
(a) chromosomes are halved at anaphase
(b) chromatids are halved at anaphase
(c) the same number of chromosomes and chromatids
(d) both chromosomes and chromatids are halved at anaphase

Answer

Answer: (a)

9. Colchicine arrests cell division at
(a) interphase
(b) prophase
(c) metaphase
(d) anaphase

Answer

Answer: (c)

10. Cell division occurring during cleavage
(a) meiosis
(b) mitosis
(c) amitosis
(d) closed mitosis

Answer

Answer: (d)

300+ TOP MCQs on Chromosome Structure and Answers

MCQs on Chromosome Structure :

1. The least level of chromosome organization is
(a) 30nm fibre
(b) solenoid
(c) nucleosome
(d) none of the above

Answer

Answer: (c)

2. This has the largest number of chromosomes
(a) Pisum sativum
(b) Giant redwood tree
(c) Haplopappus gracilis
(d) Ophioglossum reticulatum

Answer

Answer: (d)

3. A chromosome with a very short arm and a very long arm is referred to as
(a) Metacentric
(b) telocentric
(c) Acrocentric
(d) Sub-metacentric

Answer

Answer: (c)

4. A chromosome is the thickest during
(a) anaphase
(b) prophase
(c) interphase
(d) metaphase

Answer

Answer: (d)

5. The diagrammatic representation of karyotype (morphological representation of chromosomes) of a species is known as
(a) Cladogram
(b) Ecogram
(c) Chromogram
(d) Idiogram

Answer

Answer: (d)

6. If Bb is a gene pair of an individual then the alleles for this gene pair are
(a) A and B
(b) a and A
(c) a and b
(d) b and B

Answer

Answer: (d)

7. Euchromatin
(a) stains lightly
(b) is partially condensed
(c) genetically active chromatin with genes
(d) all of the above

Answer

Answer: (d)

8. The point at which polytene chromosomes appear to be attached together is known as
(a) centriole
(b) centromere
(c) chromomere
(d) chromocenter

Answer

Answer: (d)

9. In which typical stage are Lampbrush chromosomes observed?
(a) meiotic prophase
(b) mitotic metaphase
(c) mitotic prophase
(d) mitotic anaphase

Answer

Answer: (a)

10. Each of the chromosome at the anaphase stage of a bone marrow cell in our body has
(a) one chromatid
(b) two chromatids
(c) several chromatids
(d) no chromatids

Answer

Answer: (a)

300+ TOP MCQs on Life Processes and Answers

MCQs on Life Processes :

1. Entities exhibiting properties of both non-living and living are:
(a) diatoms
(b) lichens
(c) bacteria
(d) viruses

Answer

Answer: (d)

2. This has a smaller intestine
(a) carnivore
(b) herbivore
(c) both (a) and (b)
(d) none of the above

Answer

Answer: (a)

3. Which of these substances is transported by the blood plasma?
(a) Carbon dioxide
(b) Nitrogenous waste
(c) Food
(d) All of the above

Answer

Answer: (d)

4. Here, the maximum exchange of material between blood and surrounding cells takes place
(a) Veins
(b) Heart
(c) Capillaries
(d) Arteries

Answer

Answer: (c)

5. In photosynthesis, the chlorophyll is used for
(a) No function
(b) reduction of carbon dioxide
(c) breaking down the water molecule
(d) absorbing light

Answer

Answer: (d)

6. The enzymes found in intestinal juice finally convert
(a) fats into fatty acids and glycerol
(b) proteins to amino acids
(c) complex carbohydrates into glucose
(d) all of these

Answer

Answer: (d)

7. The respiratory pigment in human beings is
(a) insulin
(b) enzymes
(c) haemoglobin
(d) none of these

Answer

Answer: (c)

8. This structure guards the opening of the hepatopancreatic duct into the duodenum
(a) Pyloric sphincter
(b) Sphincter of Oddi
(c) Semilunar valve
(d) Ileocaecal valve

Answer

Answer: (b)

9. Pick the correct one
(a) Serum = Blood + Fibrinogen
(b) Lymph = Plasma + RBC + WBC
(c) Plasma = Blood – Lymphocytes
(d) Blood = Plasma + RBC + WBC

Answer

Answer: (d)

10. Reduction of blood pH will
(a) reduces the rate of heartbeat
(b) reduces the blood supply to the brain
(c) releases bicarbonate ions by the liver
(d) decrease the affinity of haemoglobin with oxygen

Answer

Answer: (d)

300+ TOP MCQs on Meiosis and Answers

MCQs on Meiosis :

1. The evolutionary advantage of meiosis can be best explained by which of these statements?
(a) Meiosis alternates with mitosis from one to the next generation
(b) Meiosis is essential for sexual reproduction
(c) Passing of the same genetic system from one to next generation
(d) Genetic recombination is possible from one to next generation

Answer

Answer: (d)

2. One of these events does not take place during meiosis
(a) One successive division without any DNA replication
(b) Chiasmata formation and crossing over
(c) Segregation of homologous chromosomes
(d) Separation of sister chromatids

Answer

Answer: (a)

3. The meiotic division takes place in
(a) Meristematic cells
(b) Conductive cells
(c) Reproductive cells
(d) Vegetative cells

Answer

Answer: (c)

4. Name the event wherein the paternal and maternal chromosomes change their material with each other in cell division
(a) Crossing over
(b) Synapsis
(c) Dyad forming
(d) Bivalent forming

Answer

Answer: (a)

5. The reason for daughter cells to differ from parent cells and also each other in meiosis is;
(a) Segregation and crossing over
(b) Segregation and independent assortment
(c) Segregation, crossing over and independent assortment
(d) Independent assortment and crossing over

Answer

Answer: (c)

6. Continuous variations are due to
(a) Mutation
(b) Crossing over
(c) Polyploidy
(d) Chromosomal aberrations

Answer

Answer: (b)

7. Synapsis takes place between
(a) Spindle fibre and centromere
(b) mRNA and ribosomes
(c) a female and a male gamete
(d) Two homologous chromosomes

Answer

Answer: (d)

8. Mendelian factor (Aa) is segregated during
(a) Anaphase I
(b) Anaphase II
(c) Diplotene
(d) Zygotene/Pachytene

Answer

Answer: (a)

9. The stage of prophase I wherein crossing over occurs is
(a) Zygotene
(b) Diplotene
(c) Leptotene
(d) Pachytene

Answer

Answer: (d)

10. Meiosis I is reductional division and meiosis II is equational division because of
(a) Separation of chromatids
(b) Crossing over
(c) The disjunction of homologous chromosomes
(d) The pairing of homologous chromosomes

Answer

Answer: (a)

300+ TOP MCQs on Neurons Nerve Impulse and Answers

MCQs on Neurons Nerve Impulse :

1. The Myelin sheath is derived from the
(a) Microglia
(b) Neuroglial cells
(c) Schwann cells
(d) Nerve cells

Answer

Answer: (c)

2. Nissl’s granules are found in
(a) Nerve cells
(b) WBC
(c) RBC
(d) Platelets

Answer

Answer: (a)

3. Which of these is a disease of the myelin sheath?
(a) Polio
(b) Leprosy
(c) Multiple sclerosis
(d) Alzheimer

Answer

Answer: (c)

4. This neurotransmitter is not a biogenic amine
(a) Serotonin
(b) Dopamine
(c) Norepinephrine
(d) Neuropeptides

Answer

Answer: (d)

5. A nerve impulse jumps from one __________ to another during saltatory conduction
(a) Synapse
(b) Axon
(c) Node of Ranvier
(d) Myelin sheath

Answer

Answer: (c)

6. ________ are the neurons carrying impulses away from the central nervous system
(a) Efferent nerves
(b) Afferent nerves
(c) Extensors
(d) Sensory nerves

Answer

Answer: (a)

7. This amongst the following is found in muscle cells and nerves
(a) membrane potential
(b) potassium equilibrium potential
(c) resting potential
(d) sodium equilibrium potential

Answer

Answer: (c)

8. Which of these has the highest permeability in a resting nerve cell?
(a) Cl-
(b) Na+
(c) K+
(d) I-

Answer

Answer: (c)

9. For the first time, research on nerve cells was carried out on this organism
(a) Grasshopper
(b) Drosophila melanogaster
(c) Octopus
(d) Giant squid

Answer

Answer: (d)

10. Neurotransmitters can inhibit or excite neurons. _________ for example, is inhibitory whereas __________ is excitatory
(a) GABA; glutamate
(b) Glutamate; GABA
(c) Serotonin; dopamine
(d) None of these

Answer

Answer: (a)

300+ TOP MCQs on Blood Groups and Answers

MCQs on Blood Groups :

1. In the ABO system, blood group ‘O’ is characterized by the:
(a) presence of antigen O
(b) presence of both antigen A and antigen B
(c) absence of both antigen A and antigen B
(d) presence of antigen A and absence of antigen B

Answer

Answer: (c)

2. Antiserum is
(a) blood serum containing specific antibodies
(b) blood serum containing specific antigens
(c) blood serum containing a mixture of antigens and antibodies
(d) blood serum in which antigens and antibodies are both absent

Answer

Answer: (a)

3. A false positive result is best described as one that is given
(a) by a substance other than that being tested for
(b) when the substance being tested for is present in large amounts
(c) when substance being tested for is present in minute quantities
(d) when substance being tested for is absent

Answer

Answer: (a)

4. Which antibodies are found in the plasma of a person with type A blood?
(a) anti A, but not anti B
(b) neither anti A nor anti B
(c) both anti A and anti B
(d) anti B, but not anti A

Answer

Answer: (d)

5. Under this circumstance an antigen-antibody reaction will occur.
A person with
(a) Type A blood is given type O blood
(b) Type AB blood is given type O blood
(c) Type O blood is given type A blood
(d) Type AB blood is given type B blood

Answer

Answer: (c)

6. When typing blood, a positive reaction
(a) shows which antigens are present
(b) shows clumping
(c) helps deduce which blood type the sample is
(d) all of the above

Answer

Answer: (d)

7. If a blood type ends in + (positive) that means
(a) your attitude is positive
(b) you are positive for an Rh protein
(c) you are positive you know your blood type
(d) + sign at the end is insignificant

Answer

Answer: (b)

8. In context of the ABO blood group, a transfusion of AB blood may be give to a person who has blood type
(a) A
(b) O
(c) B
(d) AB

Answer

Answer: (d)

9. Human blood types in the ABO blood group are identified by
(a) clotting factors in plasma
(b) microscopic examination of white blood cells
(c) antigen-antibody reactions
(d) series of enzyme controlled reactions

Answer

Answer: (c)

10. Red blood cells that do not contain either A or B antigens on their surface are normally found in the person with blood type
(a) A
(b) O
(c) B
(d) AB

Answer

Answer: (b)