In which of the following processes, active transport is NOT used?
Passage of Na+ and Cl- through hydrophilic channel created by protein molecules
Movement of ions such as Na+ and Cl- through hydrophilic channels formed by membrane proteins is facilitated diffusion, a passive transport process that moves ions down their concentration gradient without using ATP. In contrast, kidney reabsorption of glucose/amino acids, phloem loading of sugar, and intestinal absorption of glucose and electrolytes are all energy-dependent active co-transport mechanisms. Hence, active transport is NOT used in the ion-channel process described in option (c).
Polynucleotide chain of DNA contains
Cell wall isnotpresent in cells of _______
The process of copying genetic information from one strand of DNA into RNA is termed as
Which one of the following is a feature of Membrane?
Which one of the following statements about starch and glycogen is correct?
Which one of the following statements about variations is not true ?
In ovules of Angiosperms, which one of the following is not a haploid cell?
In the following simplified diagram of at plant cell, five parts / organelles are marked from 1 to 5:

Which one of the following correctly represents the above parts / organelles?
Which one of the following is the correct combination of organelles and their functions?
In plant cells
Which of the following is an epithelial tissue?
I. Squamous
II. Ciliated
Cells of ______ and ______ tissues are living cells.
The process of converting ammonia into nitrates is called:
Which of the following is not true about prokaryotic cells?
Fore limbs of whale, bat, tiger and man are examples of