The term 'cry' refers to:
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Explanation
The text says, 'The toxin is coded by a gene named cry.'
Zoology MCQs for NEET — Practice Questions with Answers
Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Ladybirds are useful biocontrol agents for getting rid of:
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Explanation
The text states, 'The very familiar beetle with red and black markings – the Ladybird, and Dragonflies are useful to get rid of aphids and mosquitoes, respectively.'
Which of the following is true regarding Bt toxins?
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Explanation
The text explicitly states, 'most Bt toxins are insect-group specific.'
Which of the following statements about ribosomes is INCORRECT?
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Explanation
According to the NCERT text, 'The eukaryotic ribosomes are 80S while the prokaryotic ribosomes are 70S. Each ribosome has two subunits, larger and smaller subunits (Fig 8.9). The two subunits of 80S ribosomes are 60S and 40S while that of 70S ribosomes are 50S and 30S.' Therefore, the statement that 80S ribosomes have 50S and 30S subunits is incorrect.
Svedberg's Unit (S) in relation to ribosome subunits indirectly measures:
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Explanation
The NCERT text states: 'Here ‘S’ (Svedberg’s Unit) stands for the sedimentation coefficient; it is indirectly a measure of density and size.'.
Ribosomes are composed of:
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Explanation
The NCERT text mentions: 'They [ribosomes] are composed of ribonucleic acid (RNA) and proteins and are not surrounded by any membrane.'.
In eukaryotic cells, ribosomes are found in all of the following locations EXCEPT:
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Explanation
The NCERT text states: 'Within the cell, ribosomes are found not only in the cytoplasm but also within the two organelles – chloroplasts (in plants) and mitochondria and on rough ER.' Lysosomes are membrane-bound organelles that contain digestive enzymes and do not inherently contain ribosomes.
Rough Endoplasmic Reticulum (RER) is characterized by the presence of ribosomes on its outer surface. RER is frequently observed in cells primarily involved in:
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Explanation
NCERT states: 'RER is frequently observed in the cells actively involved in protein synthesis and secretion.' This is directly linked to the function of ribosomes in protein synthesis.
What is the approximate size of prokaryotic ribosomes?
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Explanation
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:
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Explanation
The NCERT text specifies: 'The ribosomes of the chloroplasts are smaller (70S) than the cytoplasmic ribosomes (80S).'
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