Is there anything more annoying than when you come across a question that you understand everything about, but you're not sure where they are going with the question?
During cell division, which of the following stages are most similar?
D. Mitotic metaphase and meiosis metaphase II
During mitotic metaphase, the individual chromosomes are lined up single-file at the center of the cell. Similarly, during metaphase II of meiosis, the individual chromosomes are also lined up single-file at the center of the cell (while the total chromosome count has been reduced from 2n to n, these stages still appear the most similar visually), so the answer choice is correct.
This is flat out wrong. Telophase would appear the most similar as the chromosomes have decondensed back to chromatin. There would be no way to make any visual distinction between the two as there would be no more chromosomes to compare. Meanwhile in mitotic metaphase vs. meiosis II metaphase, one has literally twice the amount of chromosomes lined up in the center. Pretty damn easy to see the difference there.
Another weird question:
Which of the following has a similar function to the cristae of mitochondria?
Similar to the cristae of the mitochondria, the thylakoid membrane in chloroplast is also the site of chemiosmosis, so the answer choice is correct. Both contain ATP synthase responsible for producing ATP using an established H+ gradient across an internal membrane. While functionally similar, the key difference between the two is that in chloroplast, H+ move from inside the thylakoid lumen outward to the stroma to synthesize ATP, while in mitochondria H+ move from outside the cristae (the intermembrane space) inward to the mitochondrial matrix.
Sure, the mitochondrial inner membrane and thylakoid membrane both act as electron transport chains.... that is basic knowledge. But the function of the cristae specifically (which is not the same as just stating mitochondrial inner-membrane) is to increase the surface area. Why add ambiguity to a question that should be straight forward...
During cell division, which of the following stages are most similar?
- A. Mitotic prophase and meiosis metaphase I
- B. Mitotic telophase and meiosis telophase I
- C. Mitotic anaphase and meiosis anaphase I
- D. Mitotic metaphase and meiosis metaphase II
- E. Mitotic metaphase and meiosis metaphase I
D. Mitotic metaphase and meiosis metaphase II
During mitotic metaphase, the individual chromosomes are lined up single-file at the center of the cell. Similarly, during metaphase II of meiosis, the individual chromosomes are also lined up single-file at the center of the cell (while the total chromosome count has been reduced from 2n to n, these stages still appear the most similar visually), so the answer choice is correct.
This is flat out wrong. Telophase would appear the most similar as the chromosomes have decondensed back to chromatin. There would be no way to make any visual distinction between the two as there would be no more chromosomes to compare. Meanwhile in mitotic metaphase vs. meiosis II metaphase, one has literally twice the amount of chromosomes lined up in the center. Pretty damn easy to see the difference there.
Another weird question:
Which of the following has a similar function to the cristae of mitochondria?
- A. Thylakoid membrane in chloroplast
- B. Cisternae in Golgi complex
- C. Nuclear envelope
- D. Intermembrane space in chloroplast
- E. Endoplasmic reticulum
Similar to the cristae of the mitochondria, the thylakoid membrane in chloroplast is also the site of chemiosmosis, so the answer choice is correct. Both contain ATP synthase responsible for producing ATP using an established H+ gradient across an internal membrane. While functionally similar, the key difference between the two is that in chloroplast, H+ move from inside the thylakoid lumen outward to the stroma to synthesize ATP, while in mitochondria H+ move from outside the cristae (the intermembrane space) inward to the mitochondrial matrix.
Sure, the mitochondrial inner membrane and thylakoid membrane both act as electron transport chains.... that is basic knowledge. But the function of the cristae specifically (which is not the same as just stating mitochondrial inner-membrane) is to increase the surface area. Why add ambiguity to a question that should be straight forward...