What is a phospholipid composed of?
A.) a polar head and a nonpolar tail
B.) a nonpolar head and a polar tail
C.) a polar head and tail
D.) a nonpolar head and tail
Answer: A.) a polar head and a nonpolar tail
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All living things need nitrogen. How does nitrogen enter the living portion of an ecosystem?
A. Atmospheric N2 taken in by soil bacteria B. Elemental nitrogen taken in by plant leaves C. Elemental nitrogen taken in by plant roots D. Atmospheric N2 taken in by photosynthesis
Which of the following microbial groups is MOST resistant to desiccation due to their cell wall?
A) gram-positive B) gram-negative C) mycoplasmas D) viruses
Cyanide binds with at least one of the molecules involved in the production of ATP. Following exposure of a cell to cyanide, most of the cyanide could be expected to be found within the
a. mitochondria. b. ribosomes. c. peroxisomes. d. lysosomes. e. endoplasmic reticulum.
Ritalin, like cocaine and amphetamines, acts by increasing the concentration of which neurotransmitter in neuronal synapses?
A) dopamine B) serotonin C) acetylcholine D) gamma-aminobutyric acid (GABA)