What description applies to a disease-causing organism that can spread from one organism to another?
A) contagious
B) infectious
C) parasitic
D) microscopic
A
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What allows fetal hemoglobin to remove oxygen from maternal hemoglobin?
A. Fetal hemoglobin has an extra heme group. B. Oxygen is more soluble in fetal blood than maternal blood. C. Fetal hemoglobin has a higher affinity for oxygen than does maternal hemoglobin. D. Fetal blood contains twice as many hemoglobin molecules than maternal blood. E. Fetal hemoglobin molecules are much larger than maternal hemoglobin molecules.
Dry heat
A. is less efficient than moist heat. B. will sterilize at 121°C for 15 minutes. C. includes tyndallization. D. is used in devices called autoclaves. E. cannot sterilize.
What role would an owl that eats a seed-eating mouse perform in a food chain?
A) producer B) primary consumer C) secondary consumer D) tertiary consumer
The trophoblast secretes ____, which signals the corpus luteum that pregnancy has begun
a. estrogen b. a gray crescent c. progesterone d. hCG e. an enzyme