P bodies play an important role in
A) post-transcriptional regulation in eukaryotic cells.
B) epigenetic regulation in eukaryotic cells.
C) operon regulation in prokaryotic cells.
D) chromosome inactivation.
E) epigenetic and post-transcriptional regulation in eukaryotic cells.
Answer: A
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A zygote is a fertilized egg formed by an egg and a sperm. The zygote undergoes many mitotic events as it develops into a solid ball of cells (ie, blastomeres) called a blastula. What changes occur in this early cleavage?
A. During the initial stages of cleavage, there is a tremendous increase in the number and size of blastomeres. B. During the initial stages of cleavage, there is a tremendous decrease in the number and size of blastomeres. C. During the initial stages of cleavage, there is a tremendous increase in the number of cells coupled with a decrease in the size of the cells composing the developing organism. D. During the initial stages of cleavage, there is no increase in the number of cells of the developing organism, but the size of the cells increases.
Explain why the yellow solution in the graduated cylinder became a reddish color after it was incubated in the light with stems of Elodea.
What will be an ideal response?
There are exceptions to the general rule that amphibians lay eggs that develop in the water. These exceptions show extreme variation but they do have one thing in common. What is it?
A. They all develop in a camouflaged environment. B. They all develop in some sort of pouch. C. They all develop in desert environments. D. They all develop in habitats with adequate humidity. E. They all develop more slowly than eggs developed in water.
All of the following are diameters of cells that would be resolved in a microscope with a limit of resolution of 0.2 µm except
A. 0.3 µm. B. 0.2 mm. C. 0.2 µm. D. 2.0 µm. E. 0.1 µm.