The proteins necessary for the use of lactose in E. coli are collectively called the
A. lac operon.
B. lac promoter.
C. lac transcriptional operator.
D. lac suppressor.
E. lac regulator.
Answer: A
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What is the definition of a "transgenic organism?"
A) an organism that is the first of its kind to show a particular phenotype B) an organism in which a genetic defect has been corrected using gene therapy C) an organism containing a gene from another species
In a fetal pig, dorsal and ventral refer respectively to
a. the head and tail regions of the body. b. the tail and the head regions of the body. c. the upper (back) portion and the lower (underside) portion of the body. d. the lower (underside) portion and the upper (back) portion of the body.
A person who has just experienced a painful sunburn has a large number of cells undergoing mitosis for the purpose of
A. developing new stem cells that will give rise to new skin cells. B. repairing and replacing the damaged cells, in the healing process of the skin. C. replication of new DNA copies, so that meiosis will further grow new skin cells. D. modifying new cells that will have different specialties than the original damaged cells. E. asexual reproduction, to produce new skin buds that will fold over and cover the burn.
The Casparian strip is associated with the
a. epidermis. b. vascular tissue. c. cortex. d. root hairs. e. endodermis