Which one of the cell organelles is not enclosed by any membrane?
Options
(a) lysosome (b) ribosome (c) mitochondria (d) plastid
Correct Answer:
ribosome
Explanation:
Ribosomes are naked ribonucleoprotein protoplasmic particles which function […]
When a cell is dipped in a solution having a higher concentration of solutes than intracellular fluids the solution is called
Options
(a) isotonic solution (b) hypotonic solution (c) hypertonic solution (d) heterotonic […]
The fluid mosaic model of plasma membrane visualizes the central bilayer composed of phospholipids with their spherical polar heads
Options
(a) directed opposite of their surface (b) directed to their surface (c) directed […]
The F₀ – F₁ sub unit combination of particles borne by the inner membrane of mitochondria function as
Options
(a) glycolytic enzymes (b) ATP synthetase (c) mRNA (d) circular DNA
Correct Answer:
ATP […]
The electron lost by P₆₈₀ in the light reaction of photosynthesis is finally gained by
Options
(a) NADP (b) NADPH (c) ATP (d) ADP
Correct Answer:
NADPH
Explanation:
In noncyclic photophosphorylation electrons liberated […]
A 2.5 mol sample of N₂H₄ loses 25 mol of electrons in being converted to a new compound X, Assuming that all of the nitrogen appears in the new compound, what is the oxidation state […]
How many of the daughter cells obtained from a megaspore mother cell result in the matured ovum?
Options
(a) four (b) three (c) two (d) one
Correct Answer:
one
Explanation:
The megaspore mother […]
Allyl isocyanide has
Options
(a) 9 sigma bonds and 4π bonds (b) 9 sigma bonds, 3π bonds and 2 non-bonding electrons (c) 8 sigma bonds and 5π bonds (d) 8 sigma bonds, 3π […]
Primary,secondary and tertiary amines may be separated by using
Options
(a) benzene (b) diethyl oxalate (c) sulphonyl chloride (d) acetyl chloride
Correct Answer:
sulphonyl chloride
Explanation:
No explanation available. Be the first to […]
Chlorobenzene can be prepared by reacting aniline with
Options
(a) hydrochloric acid (b) cuprous chloride (c) chlorine in presence of anhydrous aluminum chloride (d) nitrous acid followed by heating with cuprous chloride
Correct […]
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