Adequate intake of ____ by a mother-to-be before and during early pregnancy may reduce the risk of spina bifida and
other serious neural tube defects.
a. carbohydrates
b. folic acid
c. calcium
d. vitamin C
e. sodium
ANSWER: b
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Which of the following levels of gene expression allows the most rapid response to environmental change?
A) transcriptional control B) translational control C) post-translational control
Contraction of ______ muscle is mostly voluntary.
A. caridac B. smooth C. skeletal D. two of the above
Ecosystem diversity
A. is primarily associated with aquatic habitats. B. is the diversity of animal species within a defined geographical area. C. includes only species-rich ecosystems. D. refers to the structure and function within an ecosystem.
The role of the antenna complex in a photosystem is to
A. transfer excited electrons to the primary electron acceptor.
B. generate glucose.
C. generate NADPH.
D. capture photons from sunlight.