Totipotent nuclei are capable of:
a. controlling the expression of other genes in the nucleus.
b. directing normal development of an organism.
c. causing cells to lose the ability to differentiate.
d. undergoing unlimited nuclear divisions.
e. stopping the cell cycle at will
B
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A cross is done between parents with genotypes aaBbCc and aaBbcc. What is the probability that
offspring will have the same phenotype as the first parent? Assume that capital letters indicate dominant alleles and lower case letters indicate recessive alleles.
a. 1/8 b. 1/4 c. 3/8 d. 3/16 e. 9/16
The hormone whose levels remain high when the
body is suffering from inflammation and stress is a. cortisol. b. somatotropin. c. thymosin. d. prolactin. e. parathyroid hormone.
Describe where in the process of meiosis independent assortment of genes occurs
What will be an ideal response?
The lab you work in has discovered a previously unidentified extracellular signal molecule called QGF, a 75,000-dalton protein. You add purified QGF to different types of cells to determine its effect on these cells
When you add QGF to heart muscle cells, you observe an increase in cell contraction. When you add it to fibroblasts, they undergo cell division. When you add it to nerve cells, they die. When you add it to glial cells, you do not see any effect on cell division or survival. Given these observations, which of the following statements is most likely to be true? (a) Because it acts on so many diverse cell types, QGF probably diffuses across the plasma membrane into the cytoplasm of these cells. (b) Glial cells do not have a receptor for QGF. (c) QGF activates different intracellular signaling pathways in heart muscle cells, fibroblasts, and nerve cells to produce the different responses observed. (d) Heart muscle cells, fibroblasts, and nerve cells must all have the same receptor for QGF.