Which of the following is part of the mitotic spindle?
A. sister chromatid
B. centromere
C. nucleolus
D. aster
E. nuclear membrane
Answer: D
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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
In addition to being the world's major food source, marine organisms are economically important
Indicate whether the statement is true or false
Which of the following is characteristic of sponges and hydras?
a. lack of an actual circulatory system b. lack of a reproductive system c. lack of a digestive system d. lack of a muscle system
Constructions of bones and teeth, blood clotting, muscle contraction, nerve contraction
What will be an ideal response?