Download PDF тАУ UKSSSC LEO Biology Mock Test 2026: 100 Questions Full Practice Test
UKSSSC LEO Biology Mock Test 2026: 100 Questions Full Practice Test
Q1. According to the Fluid Mosaic Model proposed by Singer and Nicolson (1972), which of the following statements accurately describes the structure and dynamic nature of the plasma membrane?
A) Lipids form a continuous rigid monolayer with proteins embedded immobility on the outer surface
B) Phospholipids form a quasi-fluid bilayer within which integral proteins can move laterally
C) Proteins form a continuous bilayer sandwiched between two lipid monolayers
D) Carbohydrates form the central hydrophobic core preventing any protein mobility
In the fluid mosaic model, the cell membrane is depicted as a two-dimensional liquid of a phospholipid bilayer in which protein molecules are embedded and capable of lateral movement, imparting fluidity and functional dynamism to the membrane.
Q2. Which of the following cellular structures is non-membrane bound and serves as the primary site of ribosomal RNA (rRNA) synthesis and ribosome subunit assembly in eukaryotic cells?
A) рддрд╛рд░рдХрдХрд╛рдп (рд╕реЗрдВрдЯреНрд░реЛрд╕реЛрдо)
B) рдкрд░рдСрдХреНрд╕реАрд╕реЛрдо
C) рдХреЗрдиреНрджреНрд░рд┐рдХрд╛ (рдиреНрдпреВрдХреНрд▓рд┐рдпреЛрд▓рд╕)
D) рдЧреНрд▓рд╛рдЗрдСрдХреНрд╕реАрд╕реЛрдо
Answer: (C)
The nucleolus is a dense, non-membrane bound sub-nuclear structure where ribosomal RNA transcription, processing, and assembly of ribosome subunits take place.
Q3. Given below are two statements regarding prokaryotic and eukaryotic cellular organization: Statement I: Prokaryotic 70S ribosomes consist of 50S and 30S subunits, containing 16S rRNA in the smaller subunit. Statement II: Prokaryotic cell walls are primarily composed of cellulose and pectin with ester-linked lipids in eubacteria.
In the light of the above statements, choose the correct answer from the options given below:
A) Both Statement I and Statement II are correct
B) Both Statement I and Statement II are incorrect
C) Statement I is correct but Statement II is incorrect
D) Statement I is incorrect but Statement II is correct
A) рдХрдерди I рдФрд░ рдХрдерди II рджреЛрдиреЛрдВ рд╕рд╣реА рд╣реИрдВ
B) рдХрдерди I рдФрд░ рдХрдерди II рджреЛрдиреЛрдВ рдЧрд▓рдд рд╣реИрдВ
C) рдХрдерди I рд╕рд╣реА рд╣реИ рд▓реЗрдХрд┐рди рдХрдерди II рдЧрд▓рдд рд╣реИ
D) рдХрдерди I рдЧрд▓рдд рд╣реИ рд▓реЗрдХрд┐рди рдХрдерди II рд╕рд╣реА рд╣реИ
Answer: (C)
Statement I is correct because prokaryotes possess 70S ribosomes (composed of 50S and 30S subunits; the 30S subunit contains 16S rRNA). Statement II is incorrect because bacterial cell walls are composed of peptidoglycan (murein), not cellulose and pectin.
Q4. During which sub-stage of Prophase-I of Meiosis does the dissolution of the synaptonemal complex occur, leading to the visualization of X-shaped structures known as chiasmata?
Dissolution of the synaptonemal complex occurs during the Diplotene stage, leaving homologous chromosomes attached only at the points of crossing over, visible as X-shaped chiasmata.
A. рдЧреЛрд▓реНрдЬреАрдХрд╛рдп (Golgi Complex) B. рд▓рд╛рдЗрд╕реЛрд╕реЛрдо (Lysosome) C. рдкрд░рдСрдХреНрд╕реАрд╕реЛрдо (Peroxisome) D. рдорд╛рдЗрдЯреЛрдХреЙрдиреНрдбреНрд░рд┐рдпрд╛ (Mitochondria)
The alpha-helix is stabilized by intramolecular hydrogen bonds formed between the C=O group of residue n and the N-H group of residue n+4 along the polypeptide backbone.
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