The presence of a suntan is due to increased activity of ________ in response to increased levels of ultraviolet radiation
Fill in the blank(s) with correct word
melanocytes
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A dysfunctional cell lacks a signal peptidase and is unable to cleave the ER signal sequence from proteins translated in the ER. What will be the effect on the cell's proteins?
A. The cell will have no integral membrane proteins B. All cellular proteins will have an ER signal sequence C. There will be a common signal sequence at the N-terminus of all integral membrane proteins in the plasma membrane D. All cellular proteins will become membrane proteins E. There will be a common signal sequence at the C-terminus of all integral membrane proteins in the nuclear envelope
What is the term for a culture made from one isolated colony?
A. Pure B. Mixed C. Axenic D. Both axenic and mixed are correct. E. Both axenic and pure are correct.
Which of the following physiological responses occurs in the human body when it becomes overheated?
A) slowing of the heart rate B) constriction of blood vessels in the skin C) increased blood flow to the skin D) retention of water
The chromosomes line up in the middle of the cell during
A) prophase. B) anaphase. C) metaphase. D) telophase. E) prophase II.