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NEET UG Neet B03 — practice questions

Explore 24 free Neet B03 questions in NEET UG Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Neet B03 questions and exercises with answers

Showing questions 1–24 of 24.

In a typical bacterial envelope, what is the outside-to-inside order?Read the answer and worked solution →How are phospholipids oriented in a cell membrane?Read the answer and worked solution →An ion moves from lower to higher concentration across a membrane using ATP. This is:Read the answer and worked solution →Which pairing correctly describes neighbouring plant cells?Read the answer and worked solution →Vesicles from the ER first fuse with which face of the Golgi?Read the answer and worked solution →The single membrane enclosing a plant vacuole is the:Read the answer and worked solution →In Amoeba, the contractile vacuole is important for:Read the answer and worked solution →Microbodies in plant and animal cells are:Read the answer and worked solution →Which feature distinguishes a centriole from a typical motile axoneme?Read the answer and worked solution →Short cilia beating on a cell surface can directly:Read the answer and worked solution →Which description of interphase chromatin is correct?Read the answer and worked solution →Nuclear pores principally permit exchange of:Read the answer and worked solution →Which leucoplast–storage pairing is correct?Read the answer and worked solution →The order of amino acids from the N-terminus to C-terminus defines a protein’s:Read the answer and worked solution →Alpha helices and beta-pleated sheets are examples of protein:Read the answer and worked solution →Heat unfolds an enzyme without cleaving its peptide chain. Which structural level is directly lost?Read the answer and worked solution →A triglyceride contains glycerol esterified with:Read the answer and worked solution →Which statement about nucleic acids is correct?Read the answer and worked solution →An enzyme transfers a non-hydrogen group from S–G to S′. It is a:Read the answer and worked solution →An enzyme interconverts positional isomers without joining two molecules. It is an:Read the answer and worked solution →In NCERT’s enzyme nomenclature, the numerical designation primarily reflects the:Read the answer and worked solution →An enzyme is most active at pH 7 and less active at pH 5 and 9. Its optimum pH is:Read the answer and worked solution →Which sequence correctly represents an enzyme’s catalytic cycle?Read the answer and worked solution →Why is the nucleolus continuous with the surrounding nucleoplasm?Read the answer and worked solution →

Worked practice questions

In a typical bacterial envelope, what is the outside-to-inside order?

  1. Cell wall → membrane → glycocalyx
  2. Glycocalyx → cell wall → membrane
  3. Membrane → glycocalyx → cell wall
  4. Cell wall → glycocalyx → membrane
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Correct answer: B. Glycocalyx → cell wall → membrane

The glycocalyx is outermost, followed by the cell wall and plasma membrane. Together they form a protective envelope.

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How are phospholipids oriented in a cell membrane?

  1. Heads inward; tails face water
  2. Heads and tails both face water
  3. Heads face water; tails inward
  4. Heads and tails both face inward
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Correct answer: C. Heads face water; tails inward

Polar heads face the aqueous surroundings on both sides. Hydrophobic tails face each other inside the bilayer, away from water.

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An ion moves from lower to higher concentration across a membrane using ATP. This is:

  1. Simple diffusion
  2. Osmosis
  3. Passive transport
  4. Active transport
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Correct answer: D. Active transport

Movement against a concentration gradient requires energy. ATP-dependent movement from lower to higher concentration is active transport.

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