FREE NEET Biology Practice MCQ Test: Cell The Unit Of Life Exercise 4 Questions Answers With Detailed Explanations [PDF]

Answer: (d)

Endoplasmic reticulum and ribosomes are the cell organelles which were discovered after the introduction of electron microscope.

Answer: (c)

Answer: (b)

The charged or polar lining of the channel proteins allows passage of polar and charged molecules.

Answer: (c)

Post-translational modification is a step in protein biosynthesis. Proteins are created on ribosomes translating mRNA into polypeptide chains. These polypeptide chains undergo post-translational modification, such as folding, cutting and other processes, before becoming the mature protein product. Proteins synthesised by the rough endoplasmic reticulum and lipids synthesised by smooth endoplasmic reticulum reach the cisternae of the Golgi apparatus. Here, they combine with carbohydrates to form glycoproteins and glycolipids. This process is called glycosylation.

Answer: (c)

Answer: (c)

Answer: (d)

Answer: (d)

Cell membrane of E.coli, a bacteria and Chlamydomonas, a unicellular green alga does not differ. As in both cell membrane is composed of lipids and proteins.

Answer: (d)

Answer: (c)

Answer: (c)

Answer: (a)

Plants are autotrophs and synthesize their food in the process of photosynthesis with the help of chloroplast (plastid).

Answer: (a)

Answer: (a)

Answer: (a)

Answer: (b)

Answer: (a)

Answer: (b)

Answer: (d)

Nucleoproteins are compounds present in cells of living organisms that consist of nucleic acids with proteins. Nucleoproteins are synthesized in cytoplasm. These are conjugated proteins. They are of two types -deoxyribonucleoproteins and ribonucleoproteins.

Answer: (b)