During human development, the maternal and fetal blood circulation do not become separate until the second trimester

1.True
2.False


2

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology