In placental organisms, the ________ of the embryo merges with the endometrial lining of the uterus to form the placenta
A) blastopore B) chorion C) amnion D) yolk sac E) allantois
B
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A variety of E. coli clones have been isolated, and the DNA has been extracted, digested with restriction enzymes, denatured, separated by gel electrophoresis, and transferred to nylon membrane by the Southern blot procedure. A radioactive probe is used that hybridizes with a gene of interest. The DNA corresponding to a single clone yields a single DNA band after probing the blot. Based on this
information only, A) all of the clones tested, except the one described, have the gene of interest. B) only the one clone described has the gene of interest. C) the gene of interest is located entirely on the DNA band visualized. D) the part of the gene recognized by the probe is located on the DNA band visualized. E) both choices B and D
The passageway that channels ova from the
ovary into the uterus is known as
a. a vagina. b. a uterus. c. an oviduct. d. the corpus luteum. e. all of these
Which of the following has no organelles, ribosomes, or cytoplasm?
A) A bacterium B) A cyanobacterium C) A plant D) A virus E) An alga
Which region of the brain controls breathing and heart rate?
A) Cerebrum B) Thalamus C) Medulla D) Hypothalamus E) Cerebellum