Competitive Exams: Zoology MCQs (Practice_Test 32 of 112)
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- Which one among the following amino acids cannot participate in alpha-helical formation?
- Histidine
- Proline
- Threonine
- All the above
- Which one of the following statements is correct? A restriction endonuclease can
- cleave DNA strands within a nucleic add chain without any restriction
- recognize specific short sequences of DNA and cleave the duplex
- cleave nucleotides from the ends of polynucleotide chain without any restriction
- cleave nucleotides one at a time from the end of a polynucleotide chain from the 5 ‘or 3’ end
- Consider the following statements:
- During elongation process of translation the charged t-RNA forms complex with the elongation factor.
- Then the complex enters through the P site of the ribosome.
- then gets attached with the anticodon of mRNA.
Which of the statements given above is/are correct?
- 1 only
- 2 and 3 only
- 1 and 4 only
- 1,2 and 3
- Colchicine arrests cell division during which one of the following phases of the cell cycle?
- Gi-phase
- 5-phase
- Early Prophase
- Metaphase
- Which one of the following is not required for PCR reaction?
- DNA template
- Deoxy-nucleoside triphosphates
- Ribonucleotides
- Tag DNA Polymerase
- Ecdysone is produced by which of the following?
- Neurosecretory cells
- Protocerebrum
- Prothoracic gland
- Corpora allata
- Hyaluronidase is produced by the spermatozoa of which one of the following?
- Molluscs
- Birds
- Echinoderms
- Mammals
- Which one of the following is correct? During spermatogenesis, Endoplasmic Reticulum (ER) is
- incorporated in the head of the sperm
- incorporated in the middle piece of the sperm
- incorporated in the tail of the sperm
- discarded from the cell
- Match List-I with List-II and select the correct answer using the code given below the lists:
List-I (Name of Sugar) List-II (Composition) - Lactose
- Maltose
- Sucrose
- Glucose + glucose
- Glucose + galactose
- Glucose + fructose
- Fructose + galactose
- A
- B
- C
- 2
- 3
- 1
- 2
- 1
- 3
- 4
- 1
- 2
- 4
- 2
- 3
- Which one of the following groups represents only essential amino acids?
- Alanine, glutamine, leucine, valine
- Glycine, histidine, isoleucine, serne
- Leucine, lysine, methionine, threonine
- Proline, tyrosine, tryptophan, aspartic acid
- Consider the following statements:
- Pheromones are used to repel predators.
- Mucus secreted by the snails acts as pheromone.
- Certain steroid metabolites act as pheromones.
Which of the statements given above is/are correct?
- 1 and 2 only
- 1 and 3 only
- 3 only
- 1,2 and 3
- Consider the following
- Vasopressin deficiency
- Insulin deficiency
- Vasopressin hypersecretion
Which of the above cause polyuria?
- 1 only
- 1 and 2
- 3 only
- 2 and 3
- Which one of the following causes the calcium ion concentration in blood plasma to increase?
- Cortisone
- Testosterone
- Insulin
- Parathormone
- Consider the following statements:
- Aldosterone promotes the retention of sodium and the excretion of potassium by the kidney.
- Aldosterone exerts anti-inflammatory effects.
Which of the statements given above is/are correct?
- 1 only
- 2 only
- Both 1 and 2
- Neither 1 nor 2
- Consider the following:
- Succinate
- Succinyl CoA
- NADH + H +
- CO2
When a-Ketoglutarate dehydrogenase enzyme acts on a-Ketoglutarate, which of the above are produced?
- 1 and 2 only
- 1 and 3 only
- 1,3 and 4
- 2,3 and 4