Differences in the development of different cells in the early frog embryo (zygote to blastula) are due to
A) the differences between meroblastic and holoblastic cleavage.
B) the heterogeneous distribution of cytoplasmic determinants, such as proteins and mRNA.
C) inductive interactions occurring between the developing cells.
D) concentration gradients for regulatory molecules such as BMP-4.
E) the position of the cells relative to the zone of polarizing activity (ZPA).
Answer: B) the heterogeneous distribution of cytoplasmic determinants, such as proteins and mRNA.
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An RNA processing event that frequently leads to different protein productsencoded by a single gene is:
A. transcription. B. alternative splicing. C. alternative transcription. D. polyadenylation.
The nuclear envelope is perforated by _______________________
a. plasmodesmata b. gap junctions c. nuclear pores d. none of the above
Which of the following is false concerning stem
cells? a. They are undifferentiated cells. b. They arise from a fertilized egg. c. They can be coaxed to differentiate. d. They are obtained from a portion of a plant body. e. They may help mend damaged tissue.
A(n) ________ occurs when a gametophyte generation alternates with a sporophyte generation.
What will be an ideal response?