A deficiency of which nutrient will interfere with the proper development of the neural tube?

a. vitamin A
b. vitamin D
c. vitamin C
d. vitamin B12
e. folic acid


E

Biology & Microbiology

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As people age, their thymus shrinks. How does thymus shrinkage affect the effectiveness of vaccinations? Vaccinations will have no effect because the entire immune system is shut down

A. Vaccinations will be more effective because at birth your thymus made all the T cells you'll need for your entire life. B. Vaccinations will be less effective because B cells will not produce appropriate amounts of antibodies. C. Vaccinations will be less effective because T cell maturation is reduced. D. Vaccinations will be as effective in aging patients as in young patients because T cells develop in the bone marrow.

Biology & Microbiology

Why have scientists begun using molecular systematics to study lineages among species?

a. Molecular systematics is faster and more accurate than previous ways of classifications. b. Molecular systematics is slower, but more accurate, than previous ways of classification. c. Molecular systematics is faster but less accurate than previous ways of classification. d. Molecular systematics is slower and less accurate and is being replaced as a classification method.

Biology & Microbiology

Which substances are the most plentiful biological

molecules in the biosphere? a. carbohydrates b. salts and minerals c. proteins d. fats e. nucleic acids

Biology & Microbiology

The system of binomial nomenclature was devised by

A. Charles Darwin. B. Charles Lyell. C. Aristotle. D. Carolus Linnaeus.

Biology & Microbiology