In 1997, Dolly the sheep was cloned. Which of the following processes was used?
A) replication and dedifferentiation of adult stem cells from sheep bone marrow
B) separation of an early stage sheep blastula into separate cells, one of which was incubated in a surrogate ewe
C) fusion of an adult cell's nucleus with an enucleated sheep egg, followed by incubation in a surrogate
D) isolation of stem cells from a lamb embryo and production of a zygote equivalent
C
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What neurotransmitter is released at neuromuscular junctions in vertebrates?
A. acetylcholine B. serotonin C. epinephrine D. GABA E. endorphins
Mammals are least likely to be _____
a. mutualists c. brood parasites b. commensal d. predators
The process by which a molecule gives up a functional group, and a different molecule immediately
accepts it, is a. condensation. b. cleavage. c. functional group transfer. d. electron transfer. e. rearrangement.
Epidermal cells secrete a translucent, waxy ____ to slow water loss.
A. mesophyll B. cuticle C. pectin layer D. lignin layer E. trichome