Describe the difficulty in distinguishing a cell in the late stages of prophase and the early stages of metaphase
What will be an ideal response?
The phases of the cell cycle are just that: phases of a cycle. It is often difficult to distinguish between the end of one phase and the beginning of another. However chromosomes mark prophase visible by the light microscope, and metaphase by the alignment of those chromosomes along the equator of the cell. The end of metaphase and the beginning of anaphase is marked by the splitting of the centromeres and then in anaphase, their subsequent movement to the poles of the cell.
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The isoelectric point (pI) is:
A. the pH at which a protein has a net positive charge. B. the pH at which a protein has a net negative charge. C. the pH at which a protein has a net charge of zero. D. the distance a protein having a positive charge will travel in gel electrophoresis. E. the distance a protein having a negative charge will travel in gel electrophoresis.
Where are the introns removed from during MRNA post-transcriptional editing?
a. in the cytoplasm b. in the endoplasmic reticulum c. in the nucleus d. They are not removed.
If a person has a herniated disk, sometimes surgery can relieve the pain that is associated with the condition. However, one side effect can be a loss in spinal flexibility. Why does this loss occur?
What will be an ideal response?
A molecule moves down its concentration gradient using a transport protein in the plasma membrane. This is an example of
a. active transport b. facilitated diffusion c. diffusion d. exocytosis e. endocytosis