During human development, the maternal and fetal blood circulation do not become separate until the second trimester
1.True
2.False
2
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Which structure prevents blood flowing back into the atria during ventricular contractions?
A. semilunar valves B. atrioventricular valves C. sinoatrial node D. carotid blood shunts E. foramen ovale
Which of the following has episomal DNA inserted in the cell's chromosome?
A) An F+ cell B) An F' plasmid C) An Hfr cell D) An F- cell E) All except D
A man is brought to the hospital suffering from nausea, vomiting, and severe stomach cramps. He had recently returned from a hiking trip in northern Minnesota
A sample taken from the man shows a single-celled flagellate organism that lacks mitochondria but has two nuclei. This organism is a(n) A) excavate. B) apicomplexan. C) diatom. D) euglenozoan. E) green alga.
The term carnivorous as applied to carnivorous plants is not considered accurate by some biologists because
A) carnivorous plants use insects for nitrogen and minerals; an organism would have to use insects as a source of energy and matter as well to be a carnivore. B) carnivorous plants only use insects as pollinators and do not gain any nutrients from them. C) carnivorous plants do not digest whole insects; an organism would have to digest whole insects to be considered a carnivore. D) carnivorous plants do not move around; an organism must be able to move to be considered a carnivore.