Some vertebrates like frogs and humans do not have a conspicuous tail, yet even humans have the remnants of one known as the
A. sacrum.
B. lumbar.
C. fundus.
D. coccyx.
D. coccyx.
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A 6-year-old boy was diagnosed with purulent conjunctivitis caused by a species of Haemophilus. What would the biochemical profile of the organism be?
a. Growth requirements require both X and V factors; the organism is hemolytic on rabbit blood. b. Growth requirements require both X and V factors; the organism is nonhemolytic on rabbit blood. c. Growth requirements require V factor; the organism is hemolytic on rabbit blood. d. Growth requirements require X factor; the organism is nonhemolytic on rabbit blood.
To create a mouse model of the human disease Hemophilia A, in which a nonfunctional factor VIII protein results in a
blood clotting deficiency, _____. a. a cloned mutant FVIII gene is inserted into fertilized mouse eggs, which are then transferred to a foster mother for gestation and birth b. a cloned normal FVIII gene is inserted into fertilized mouse eggs, which are then transferred to a foster mother for gestation and birth c. mice with similar, naturally occurring, clotting deficiencies are cloned d. embryonic stem cells are harvested from mouse blastocysts, and grown in the lab to produce blood cells for experimental research e. adult mice are infected with bacteria that contain a copy of a mutant human FVIII gene
At present the human population is
A. in the death phase B. growing rapidly C. stable D. in the lag phase
Crossing over takes place between sister chromatids during prophase I of meiosis I
Indicate whether the statement is true or false