Cell lines derived from transformed (cancerous) cells are called __________.
a. continuous cell lines
b. primary cell lines
c. monolayers
d. plaques
e. embryonated
Ans: a. continuous cell lines
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Kinases are enzymes that can phosphorylate (transfer phosphate groups onto) macromolecules such as proteins. A particular kinase, Kinase 1 is known to promote cell division. It promotes cell division by phosphorylating Protein X. Phosphorylation of Protein X activates Protein X. Once activated, Protein X stimulates the production of other proteins such as Protein Y and Z that directly promote cell division. In order to function, Kinase 1 requires the presence of Metal A. However, in the presence of Protein A, Kinase 1 is nonfunctional. From the description, what is considered a cofactor of Kinase 1?
A. Protein X B. Protein Y C. Protein Z D. Metal A E. Protein A
Multiple sensory receptors can synapse on a single neuron. The receiving neuron has a firing rate proportional to the number of signals received. Which of the following is this an example of?
A. temporal summation B. spatial summation C. action potential D. hyperpolarization
Suppose an efficient conducting system evolved in a moss that could transport water and other materials as high as a tall tree. Which of the following statements about "trees" of such a species would be FALSE?
A) Fertilization would probably be more difficult. B) Spore dispersal distances would probably increase. C) Females could produce only one archegonium. D) Individuals would probably compete more effectively for access to light.
Induced pluripotent stem (iPS) cells ______________________
(a) are created by the expression of a set of key genes in cells derived from adult tissues so that these cells can differentiate into a variety of cell types. (b) require a supply of donor egg cells, such as embryonic stem cells. (c) can differentiate into a greater variety of adult tissues than embryonic stem cells. (d) are created by nuclear transplantation.