Free Cell The Unit Of Life (Daily Quiz: 12) NEET Biology Questions & Answers with Detailed Explanation & Full Review

Answer: (b)

In plant cells, peroxisomes are associated with photorespiration. Peroxisomes are found only in $C_3$ plants where a wasteful phenomenon of photorespiration occurs. The other organelles associated with this process are chloroplast and mitochondria. Peroxisomes are also reported in animal cells, i.e., liver and kidney cells. The peroxisome contains several enzyme such as amino transferase, glycolate oxidase, glyoxylate reductase, peroxidase and catalase, etc.

Answer: (d)

Microtubules are unbranched hollow submicroscopic tubules of protein tubulin which develop on specific nucleating regions. It can undergo quick growth or dissolution at their ends by assembly or disassembly of monomers. They are present in the cytoplasm as well as in specialised structures like centrioles, basal bodies, cilia or flagella, sensory hair, an equatorial ring of thrombocytes, spindle apparatus, chromosome fibres, nerve processes, sperm tails, axostyle of parasitic flagellates, fibre system of Stentor, a hypopharyngeal basket of Nassula, etc.

Answer: (a)

Nucleolus is a small rounded body within a resting nucleus that contains RNA and proteins. It is usually associated with a specific chromosomal site and involved in ribosomal RNA synthesis and the formation of ribosomes.