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A.An embryo forms with only ectodermal and endodermal derivatives.
B.Animal cap cells are induced by the vegetal cells to form. meso dermal derivatives.
C.The embryo regulates and forms a normal embryo.
D.Vegetal hemisphere cells are induced by the animal cap cells to form. mesodermal derivatives.
答案
更多“If cells from the animal pole of a Xenopus blastula (animal cap cells) are placed in d”相关的问题
第1题
It can be inferred from the passage that insects do not have______.
A．brains
B．backbones
C．nerve cells
D．reflexes
第2题
第3题
A. Capsaicin.
B. Leafy vegetables.
C. Broccoli.
D. Cauliflower.
第4题
What can we infer from the third paragraph？
A．Radiation can kill an animal immediately.
B．Radiation at any level is not harmless.
C．The deformed cells can reproduce themselves.
D．Protection from radiation is always necessary.
第5题
A) human stem cells are used in the research
B) a lot more private donations can be secured
C) more federal money is used for the research
D) talented scientists are involved in the research
第6题
A. A, B, F, G, E, and C
B. G, E, B, A, C, and F
C. G, E, B, and A
D. B, A, F, G, E, and C
E. A, B, E, and G
第7题
What can we infer from the passage？
A．We can't detect radioactivity even with modern equipment.
B．Only radiation at very high levels can kill an animal or human being.
C．If a few cells are only damaged, healthy cells will take the place of dead ones.
D．Radiation is harmful no matter what level it is.
第8题
The new trend in artificial intelligence research stems from ________.
A) the shift of the focus of study on to the recognition of the shapes of objects
B) the belief that human intelligence cannot be duplicated with logical, step-by-step programs
C) the aspirations of scientists to duplicate the intelligence of a ten-month-old child
D) the efforts made by scientists in the study of the similarities between transistors and brain cells
第9题
We learn from the passage that pathological fatigue happens when______.
A．you have to be in two places at once
B．the cells are subject to an excessive burden
C．the body is free from diseases
D．you are involved in too many activities
第10题
It can be inferred from the passage that ______.
A．after the installation of a great number of cells and connections, robots will be capable of self re production
B．with the rapid development of technology, people have come to realize the possibility of making a machine with human -like ability
C．once we make a machine as complex as the human brain, it will possess intelligence
D．robots will have control of the vast, man- made world in space
