Practice free Cell Structure (Zoology) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
What is the approximate size of prokaryotic ribosomes?
As per the NCERT text: 'In prokaryotes, ribosomes are associated with the plasma membrane of the cell. They are about 15 nm by 20 nm in size...'
The ribosomes present in chloroplasts of green plants are:
The NCERT text specifies: 'The ribosomes of the chloroplasts are smaller (70S) than the cytoplasmic ribosomes (80S).'
Which of the following organelles is NOT considered part of the endomembrane system, primarily because its functions are not coordinated with the others in the system, even though it contains ribosomes?
The NCERT states: 'Since the functions of the mitochondria, chloroplast and peroxisomes are not coordinated with the above components (ER, golgi, lysosomes, vacuoles), these are not considered as part of the endomembrane system.' Mitochondria are known to contain 70S ribosomes.
The outer membrane of the nucleus is continuous with which organelle and also bears ribosomes on it?
NCERT text states: 'The outer membrane usually remains continuous with the endoplasmic reticulum and also bears ribosomes on it.'
George Palade (1953) observed ribosomes as dense particles under the electron microscope. What characteristic of ribosomes made them stand out in his observations?
The NCERT text states: 'Ribosomes are the granular structures first observed under the electron microscope as dense particles by George Palade (1953).'
Who first described the nucleus as a cell organelle?
According to the NCERT text, 'Nucleus as a cell organelle was first described by Robert Brown as early as 1831.'
The material of the nucleus that stains with basic dyes was named chromatin by:
The NCERT states, 'Later the material of the nucleus stained by the basic dyes was given the name chromatin by Flemming.'
Which of the following describes the nuclear envelope?
The text mentions, 'Electron microscopy has revealed that the nuclear envelope, which consists of two parallel membranes with a space between (10 to 50 nm) called the perinuclear space...'
What is the primary function of nuclear pores?
The NCERT states, 'These nuclear pores are the passages through which movement of RNA and protein molecules takes place in both directions between the nucleus and the cytoplasm.'
Which of the following cells would typically lack a nucleus in their mature state?
The text provides examples: 'Some mature cells even lack nucleus, e.g., erythrocytes of many mammals and sieve tube cells of vascular plants.'
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