With reference to bacteria, consider the following statements: 1. There is only one chromosome in bacteria 2. The ribosomes in bacteria are larger 3. Some bacteria exhibit endocytosis Which of these statements is/are correct

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Q: 46 (IES/2002)
With reference to bacteria, consider the following statements:
1. There is only one chromosome in bacteria
2. The ribosomes in bacteria are larger
3. Some bacteria exhibit endocytosis
Which of these statements is/are correct

question_subject: 

Science

question_exam: 

IES

stats: 

0,11,39,8,16,15,11

keywords: 

{'bacteria': [4, 1, 2, 3], 'ribosomes': [1, 0, 0, 0], 'chromosome': [2, 0, 0, 1], 'endocytosis': [0, 0, 1, 0]}

Option 1 states that there is only one chromosome in bacteria. This statement is incorrect. Bacteria can have more than one chromosome. While most bacteria have only one circular chromosome, there are some bacteria that have multiple chromosomes or linear chromosomes. Therefore, option 1 is incorrect.

Option 2 states that the ribosomes in bacteria are larger. This statement is correct. Compared to eukaryotic ribosomes, bacterial ribosomes are larger. Bacterial ribosomes have a small subunit of 30S and a large subunit of 50S, making them 70S in total. Eukaryotic ribosomes, on the other hand, have a small subunit of 40S and a large subunit of 60S, making them 80S in total. Therefore, option 2 is correct.

Option 3 states that some bacteria exhibit endocytosis. This statement is incorrect. Endocytosis is a cellular process in which the cell engulfs external material by forming a vesicle around it. While endocytosis is a common process in eukaryotic cells, it is not typically observed in bacteria. Therefore, option 3 is incorrect.

Based on the explanations above, the correct option is 4, which