A single cell, the zygote, can develop into an entirely new organism with many different specialized cells. Which of the following statements about this process is false?
A) Additional genetic information for the formation of specialized cells is passed on to the developing embryo via the mother.
B) The descendant cells specialize by a process known as differentiation.
C) The zygote contains all of the genetic information required for the development of many different cell types.
D) Differentiation of the zygote into a multicellular organism results from selective gene expression.
Answer: A
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Which of the following statements accurately describes the Calvin cycle?
A) It is a carbon assimilation process. B) In this process, carbon dioxide is reduced to organic sugars. C) It occurs in the chloroplast stroma. D) The Calvin cycle is a means of carbon fixation. E) all of the above
Photosynthesis first occurs on Earth by about
___ years ago.
a. 4.6 billion b. 3.5 billion c. 2.7 billion d. 1.1 billion e. 0.5 billion
All evolutionary ancestors of modern humans have been discovered and identified
a. True b. False
Which of the following is likely to have the lowest numbers in an ecosystem?
A. producers B. carnivores C. herbivores D. consumers