Multiple functional groups are able to attach to macromolecules. What is the most useful characteristic that enables the attachment of multiple functional groups?
A. four carbon covalent bonds
B. one hydrogen ionic bond
C. three nitrogen ionic bonds
D. two oxygen covalent bonds
Answer: A
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A vein is a blood vessel that always carries
a. blood toward the heart. b. blood away from the heart. c. oxygen-rich blood. d. oxygen-poor blood.
The principal purpose of Arcata, California's, marsh and wildlife sanctuary is to
A. re-establish populations of rare cranes. B. provide an educational resource for school students. C. filter the city's sewage. D. store drinking water for urban use. E. provide open park space for the city's community.
The resting potential of a neuron is due to all of the following except:a
potassium being at a higher concentration inside the cell than out. b. sodium being at a higher concentration outside the cell than in. c. cells being more permeable to potassium than to sodium. d. the cytosol containing large molecules having a net negative charge. e. the sodium/potassium pump transporting 3 Na+ into the cell for every 2 K+ out
What is the function of the generative cell in conifers?
A. Maturation of the female cone B. Production of the archegonium C. Growth of the megaspore D. Formation of the sperm E. Dispersal of the pollen