Cytoskeleton, cilia, flagella, centrioles; nucleus
- Match List I with List II :List I:A. AxonemeB. Cartwheel patternC. CristaD. SatelliteList II:I. CentrioleII. Cilia and flagellaIII. ChromosomeIV. MitochondriaChoose the correct answer from the options given below : Answer: 1. A-II, B-I, C-IV, D-III Axoneme - the 9+2 microtubule core of cilia and flagella (A-II). Cartwheel pattern - the 9 triplet arrange... 1
- Which of the following functions is carried out by cytoskeleton in a cell? Answer: 4. Motility Key idea: The cytoskeleton is a network of protein filaments that gives mechanical support, maintains cell shape and hel... 1
- Match List - I with List - II.List - I: (a) Metacentric chromosome (b) Acrocentric chromosome (c) Sub-metacentric chromosome (d) Telocentric chromosomeList - II: (i) Centromere situated close to the end forming one extremely short and one very long a… Answer: 2. (a) - (iii), (b) - (i), (c) - (iv), (d) - (ii) Metacentric: centromere in the middle, two equal arms, (iii). Acrocentric: centrom... 1
- Read the following statements and choose the set of correct statements :(a) Euchromatin is loosely packed chromatin(b) Heterochromatin is transcriptionally active(c) Histone octomer is wrapped by negatively charged DNA in nucleosome(d) Histones are r… Answer: 3. (a), (c), (d) Only (a) Euchromatin is loosely packed and transcriptionally active: true. (b) Heterochromatin is densely packed an... 1
- Which of the following is an incorrect statement ? Answer: 1. Mature sieve tube elements possess a conspicuous nucleus and usual cytoplasmic organelles. Find the incorrect statement. Statemen... 1
- When the centromere is situated in the middle of two equal arms of chromosomes, the chromosome is referred as : Answer: 1. Metacentric The position of the centromere decides chromosome type. A centromere in the middle, giving two equal arms, makes the... 1
- The shorter and longer arms of a submetacentric chromosome are referred to as : Answer: 2. p-arm and q-arm respectively By convention the shorter arm of a chromosome is the p-arm (petite) and the longer arm is the q-arm.... 1
- Select the incorrect match : Answer: 4. Polytene Chromosomes – Oocytes of amphibians Key idea: Check each pair. Lampbrush chromosomes are diplotene bivalents (in amphibi... 1
- Which of the following is true for nucleolus ? Answer: 4. It is a site for active ribosomal RNA synthesis. The nucleolus is a non-membranous site of active rRNA synthesis and ribosome ass... 1
- Microtubules are the constituents of : Answer: 2. Spindle fibres, Centrioles and Cilia Key idea: Microtubules make up spindle fibres, centrioles (and basal bodies), and the axonem... 1