Flatworms
(a) are radially symmetrical.
(b) possess a body cavity.
(c) reproduce by parthenogenesis.
(d) have tissues derived from all three primary germ layers.
d) have tissues derived from all three primary germ layers.
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Meristems produce three plant organ systems
a. True b. False
The concentration of oxygen is lower at high altitudes. Why would this make it harder for a person to get enough oxygen into their blood?
A. Hemoglobin cannot bind oxygen well at low concentrations. B. The concentration gradient from the alveoli to the blood decreases. C. People are working harder at high altitudes and have higher demands for oxygen. D. The concentration of oxygen in the blood is too low for diffusion into tissues. E. The heart cannot obtain enough energy to pump oxygen into the blood from the alveoli.
A color-blind (recessive trait) woman will pass the allele to
a) her husband. b) none of her children. c) her sons only. d) her daughters only. e) all her children.
A group of patients was seen on an emergency basis complaining of abdominal craps and watery diarrhea within 5 hours of attending a picnic in which ham, potato salad, and custard-filled pastries were on the menu. Which of the following is the likely cause of this disease?
A. Attachment and disruption of intestinal lining due to parasitic infection B. Bacterial colonization and toxin production C. Bacterial adherence and invasion D. Performed bacterial toxin E. Replication of virus that prevents reabsorption of water