Folic acid supplements have become especially important for pregnant women because _____
A) folic acid supplies vitamins that only pregnant women can use
B) the folic acid is stored in adipose tissue by pregnant women so supplements are needed to make more available in the circulation
C) the fetus makes high levels of folic acid
D) folic acid deprivation is associated with neural tube abnormalities in a fetus
E) folic acid deprivation is a cause of heart abnormalities in a newborn
Answer: D
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Which of the following statements best describes the benefits of radiation therapy?
A. Radiation therapy can be combined with other therapies, including chemotherapy. B. Radiation therapy can be directed against specific cells and tissues within the body. C. Radiation damages the DNA within cancer cells, either slowing down cell division or stopping it altogether. D. Radiation therapy may shrink tumors, making them easier to remove surgically. E. All of the choices are correct.
After a steroid hormone binds its receptor, the hormone-receptor complex then:a
activates a G protein. b. activates a protein kinase. c. activates adenylyl cyclase. d. activates calmodulin. e. binds DNA.
Homo sapiens are the sole surviving hominid.
Answer the following statement true (T) or false (F)
What is the primary function of stems?
A) Facilitation of gas exchange B) Water absorption and movement C) Maximization of photosynthesis by leaves D) Reproduction