Which of the following is a reason for the occurrence of a lag phase in a bacterial growth curve?
A. The medium may be different from the previous growth medium so that the cells must synthesize new enzymes to use different nutrients.
B. The cells may be old and depleted of ATP, essential cofactors, and ribosomes that must be synthesized before growth can begin.
C. The organisms may have been injured and require time to recover.
D. All of these are potential reasons.
Answer: D
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How does the fetus obtain nutrients and oxygen?
A. Maternal and fetal veins are directly connected in the chorionic villi. B. Nutrients and oxygen diffuse into the umbilical capillaries from maternal blood pools that surround the chorionic villi. C. Maternal blood cells are carried across the fetal capillary walls through special pores. D. Maternal arteries and fetal veins are directly connected in the chorionic villi. E. Fetal and maternal blood pools around the chorionic villi to exchange gasses and nutrients. The blood is then returned to the umbilical vein.
In tuberculosis, when a caseous lesion calcifies, it is called a ________.
A. tubercle B. tuberculous cavity C. Ghon complex D. All of the choices are correct.
Like the insects, the arachnids (spiders and so on) have
a. three pairs of walking legs. b. one pair of antennae. c. true mandibles. d. an abdomen.
Which of the following can contribute to high blood pressure?
A) regular exercise B) eating a heart-healthy diet C) smoking D) maintaining proper weight