Which cell becomes a macrophage when leaving the bloodstream?
A. monocyte
B. lymphocyte
C. basophil
D. eosinophil
E. neutrophil
Answer: A
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Two organisms that both benefit from each other are in a symbiotic relationship called
A) ammensalism. B) commensalism. C) mutualism. D) parasitism.
Scientists believe that mitochondria may have evolved from ancient bacteria because ____
a. both are surrounded by a cell wall b. both have their own DNA and ribosomes c. the shapes and size of both are exactly the same d. both have cristae to increase surface area e. both have five chromosomes
A reason given by scientists as to why viruses are not considered living organisms is that
A. viruses can be frozen and still survive. B. viruses do not reproduce on their own. C. viruses are all smaller than the smallest known cells. D. viruses do not contain a nucleus. E. viruses do not contain genetic information.
All of the following stages must occur for a woman to get pregnant. However, after which stage can a woman be described as pregnant?
A. Menstruation B. Implantation C. Ovulation D. Intercourse