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Biology Mixed Test - 2

Biology Mix Test - 2

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Questions

Question 1 Multiple Choice (Single Answer)

Operon model of gene regulation in bacteria was proposed by

  1. Watson and Crick
  2. Hershey and Chase
  3. Meselson and Stahl
  4. Jacob and Monad
Question 2 Multiple Choice (Single Answer)

Which of the following elements is absent in DNA?

  1. Phosphorus
  2. Carbon
  3. Sulphur
  4. Hydrogen
Question 3 Multiple Choice (Single Answer)

A strand of DNA has the sequence 5′−ATTCCG−3′. The complementary strand for this is

  1. 5′−TAAGGC−3′
  2. 5′−ATTCCG−3′
  3. 5′−ACCTTA−3′
  4. 5′−CGGAAT−3'
Question 4 Multiple Choice (Single Answer)

Which of the following is an initiation codon?

  1. UAA
  2. UGA
  3. UAG
  4. AUG
Question 5 Multiple Choice (Single Answer)

The primase is used in DNA replication for

  1. joining okazaki fragments
  2. the formation of new DNA
  3. the synthesis of DNA primer
  4. the synthesis of RNA primer
Question 6 Multiple Choice (Single Answer)

If the external solution balances the osmotic pressure of the cytoplasm of a plant cell then the solution is said to be

  1. hypotonic
  2. hypertonic
  3. isotonic
  4. isotactic
Question 7 Multiple Choice (Single Answer)

Facilitated diffusion through cell membrane

  1. takes place through membrane proteins
  2. sets up a concentration gradient
  3. is dependent upon ATP
  4. takes place without any membrane proteins
Question 8 Multiple Choice (Single Answer)

Water potential is determined by

  1. soluble potential and osmotic potential
  2. pressure potential
  3. solute potential and pressure potential
  4. solute potential
Question 9 Multiple Choice (Single Answer)

DNA fingerprinting was discovered by

  1. Jacob and Monad
  2. Watson and Crick
  3. Hershey and Chase
  4. Alec Jeffrey
Question 10 Multiple Choice (Single Answer)

The role of enzyme DNA ligase in DNA replication is

  1. to add more nucleotides to the growing strand one at a time
  2. to open up the two DNA strands to expose template strands
  3. to remove incorrectly matched bases
  4. to join okazaki fragments to one another
Question 11 Multiple Choice (Single Answer)

Which of the following statements is correct about osmosis?

  1. It requires ATP.
  2. It is independent of solute concentration.
  3. It continues until the pressure potential equals the water potential.
  4. It results in the bursting of plant cells placed in pure water.
Question 12 Multiple Choice (Single Answer)

In maltose, two glucose units are linked by a

  1. peptide bond
  2. hydrogen bond
  3. glycosidic bond
  4. phosphodiester bond
Question 13 Multiple Choice (Single Answer)

Which of the following is a protein that helps in transport of glucose across cell membrane?

  1. GLUT 40
  2. GLUT 4
  3. Insulin
  4. Glucagon
Question 14 Multiple Choice (Single Answer)

Co- enzymes differ from enzymes as

  1. co-enzymes are polymers of amino acids
  2. co-enzymes are small like vitamins
  3. co-enzymes are specific for one reaction
  4. co-enzymes always carries high-energy phosphate
Question 15 Multiple Choice (Single Answer)

Which nucleoside is formed when guanine binds with ribose?

  1. Guanylic acid
  2. Guanosine
  3. Guanosine monophosphate
  4. Guanosine triphosphate
Question 16 Multiple Choice (Single Answer)

Which of the following is the nitrogen base present only in RNA?

  1. Adenine
  2. Thymine
  3. Cytosine
  4. Uracil
Question 17 Multiple Choice (Single Answer)

Which of the following is the most abundant molecule in the cell?

  1. Lipid
  2. Protein
  3. Nucleic acid
  4. Carbohydrate
Question 18 Multiple Choice (Single Answer)

The only means of gaseous movement within a plant body is by the means of

  1. imbibition
  2. cyclosis
  3. putrefaction
  4. diffusion
Question 19 Multiple Choice (Single Answer)

In semiconservative replication of DNA,

  1. the original double helix remains intact and a new double helix forms
  2. the strands of the double helix seperate and act as templates for new strands
  3. polymerisation is catalysed by RNA polymerase
  4. polymerisation is catalysed by DNA ligase enzyme
Question 20 Multiple Choice (Single Answer)

The water potential of any solution is

  1. zero
  2. always less than the water potential of pure water
  3. always having a positive value
  4. equal to water potential of pure water
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