Plant cells grow primarily by increasing ____
a. cell number through cell division
b. cell size through cell differentiation
c. pressure and volume of the central vacuole
d. the amount of extracellular matrix
e. the concentration of lignin
ANSWER: c
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Humans homozygous for the sickle cell allele have sickle cell anemia. A human that is heterozygous for the sickle cell allele is an example of _____________
A. codominance B. incomplete penetrance C. heterozygous advantage D. multiple allele systems
Which of the following pairs is NOT a mutualism?
a. mycorrhizae ? plant b. Rhizobium ? legume c. ant ? acacia tree d. giant moray ??bluestreak cleaner wrasse? e. ant ? yucca plant
The largest part of the brain of a mammal is the
a. cerebrum. b. cerebellum. c. pons. d. medulla oblongata.
What kind of bond exists between two amino acids
in a protein? a. peptide b. ionic c. hydrogen d. amino e. sulfhydroxyl