FREE NEET Biology Practice MCQ Test: Cell The Unit Of Life Exercise 3 Questions Answers With Detailed Explanations [PDF]

Answer: (d)

Answer: (d)

Answer: (a)

A bivalent consists of four chromatids and two centromeres. Bivalent is a pair of homologous chromosomes lying together in the zygotene stage of prophase I of the first meiotic division.

Answer: (a)

Answer: (d)

Answer: (d)

Answer: (b)

Answer: (d)

Answer: (a)

Answer: (c)

Ribosomal RNA is actively synthesized in nucleolus. Nucleolus is also known as ribosomal factory.

Answer: (a)

Oxysomes or $F_0 - F_1$ particles occurs on inner mitochondrial membrane. Each particle is made up of base, stalk and head and is about 10 mm in length. The number of exosomes per mitochondrion varies from $10^4 - 10^5$ . Chemically, these are made up of phospholipid core and protein cortex. Oxysomes have ATP as enzyme molecules and therefore, responsible for ATP synthesis. These elementary particles are also called $F_0 - F_1$ particles by some workers. The base of these is called $F_0$ subunit and head is called $F_1$ subunit.

Answer: (d)

Answer: (a)

The lipid component of the membrane is mainly consists of phosphoglycerides. Phosphoglyceride are glycerol-based phospholipids and main component of biological membranes. Each glycerophospholipid molecule consists of a small polar head group and two long hydrophobic chains.

Answer: (d)

Microtubular organization and type of movement differentiates prokaryotic flagella or eukaryotic flagella.

Answer: (d)

Answer: (b)

Nucleolus synthesizes and stores RNA. The ribosomal proteins are synthesized in the cytoplasm and shift to the nucleolus for the formation of ribosomal subunits by complexing with rRNA.

Answer: (d)

Cell recognition and adhesion occur due to biochemicals of cell membranes named glycoproteins and glycolipids. These are formed due to small carbohydrate molecules present on lipids and extrinsic proteins.

Answer: (b)

Answer: (a)

Addition of new cell wall particles amongst the existing one is intussusception. Growth of cell wall occurs by two methods - by intussusception and by apposition. By intussusception, the primary wall is stretched and materials of secondary wall are deposited. By apposition, materials of secondary wall are deposited in the form of thin layers.

Answer: (a)