Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
The main reason of failure of artificial classification was
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Why are reproductive characters given more weightage during advanced classification?
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George Bentham and Joseph Hooker gave the classification based on
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Phylogenetic classification systems based on
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If we want to know evolutionary relationships between organisms then which classification will resolve it :
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Microtubules are the constituents of
(a) Microtubules are structures present in cilia, flagella, centrioles and spindle fibres. They are also the part of fibres found in cytoskeleton.
The Golgi complex plays a major role
Golgi complex plays a major role in post-translational modification of proteins and glycosidation of lipids. Chloroplasts contain chlorophyll, which traps light and transform into chemical energy. Lysosomes are involved in digesting protein, fats and carbohydrates. Mitochondria are energy transferring organelles.
Ribosomal RNA is actively synthesized in
In eukaryotes, the site of synthesis of most of the ribosomal RNA (TRNA) is nucleolus. The nucleolar organizer contains many copies of ribosomal DNA (repetitive DNA). The RNA cistron of nucleolar DNA forms 45 S precursor with the help of RNA polymerase. This 45 S RNA undergoes cleavage with the help of nucleases to give 18S, 285 and 5.8S rRNA units. Out of different rRNAs, the 5S rRNA is not synthesized in nucleolus. It is synthesized outside it.
What is true about ribosomes?
Ribosomes are large, non-membranous, RNA-protein complexes which are necessary for protein synthesis. In prokaryotes, 70 S type of ribosomes are found while 80 S type of ribosomes are found in eukaryotes.
Select the correct statement from the following regarding cell membrane.
(d) In 1972, Singer and Nicoison proposed fluid mosaic model for internal structure of plasma membrane. This is most wirleiy accepted model for plasma membrane. According to this model, a membrane consists of a continuous bilayer of phospholipid molecules in which globular proteins are embedded. The lipids are arranged in a bilayer with polar heads towards outerside.
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