Extracellular ground substance is composed of
a. liquid proteins.
b. lipids.
c. polysaccharides.
d. fibrous proteins.
e. specialized cells
C
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Which two observations led Darwin to conclude that there is competition for survival?
A. Fossils and mutations B. Overproduction of organisms and limited food resources C. Gene and allele differences in organisms D. Natural selection and descent with modification
Which of these is a karyotype?
A) a display of all of the cell types in an organism B) organized images of a cell's chromosomes C) the appearance of an organism D) a display of a cell's mitotic stages
Which of the following is NOT a typical symptom of influenza?
A) fever B) chills C) headache D) diarrhea E) muscle aches
How would you best explain the correlation between an increase in Hox genes and an increase in animal body complexity?
A. Different Hox genes are expressed in different regions of the body. B. An increase in the number of Hox genes meant that fewer regulatory genes could be controlled in a species. C. As the number of Hox genes increases, the number of genes encoding proteins for appendage development decreases D. Hox genes have duplicated several times during animal evolution, but they are not responsible for an increase in body plan complexity. E. An increase in the number of Hox genes allows for greater specialization in different body regions.