Joke Collection Website - Mood Talk - I have several multiple-choice questions about biology. No, they are multiple-choice, seeking answers and explaining them in detail.
I have several multiple-choice questions about biology. No, they are multiple-choice, seeking answers and explaining them in detail.
1. B should be selected. About totipotency: 1. Highly differentiated plant somatic cells have totipotency. Only in vitro can plant cells show their totipotency under certain nutritious substances, hormones and other suitable external conditions. 2. The totipotency of differentiated somatic cells in animals is limited, but the nucleus is still totipotent. 3. The totipotency of plant cells is higher than that of animal cells, while the totipotency of germ cells is higher than that of somatic cells, and the totipotency of fertilized eggs is the highest among all cells.
2. Choose A, the degree of differentiation is opposite to totipotency, and embryonic stem cells are the cells with the lowest degree of differentiation and the largest totipotency because they are the starting point of all cells.
3. D should be selected. The cells in the root tip elongation area basically no longer divide, but grow and elongate, and its life span is long.
4. C should be selected. Cancer cells need to be constantly metabolized and proliferated, and a large amount of protein needs to be synthesized, so ribosomes should be the most increased.
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