A deficiency of which B vitamin in pregnant woman can cause birth defects?
a. riboflavinriboflavin
b. biotin
c. folic acid
d. niacin
e. thiamin
ANSWER: c
You might also like to view...
Some bacteria produce the enzyme Beta-lactamase, which results in resistance to certain antibiotics
such as penicillin. Since these same organisms reproduce asexually, they produce offspring that ____.
a. can be killed by penicillin b. have an abnormally high rate of mutation c. are resistant to penicillin d. have variable numbers of chromosomes e. can make penicillin
Growth of tissues is typically controlled by
A. the presence of specific hormones. B. frequent stimulation by nerves. C. It is not controlled, it just happens. D. the presence of any kind of hormone molecule.
Binomial nomenclature is Linnaeys' method of naming species
a. true b. false
Because organisms are made primarily of water, they resist rapid temperature changes. This useful quality is based on water's _____.
a. cohesion b. lower density in the solid phase c. high specific heat d. buffering activity e. ability to form colloids