Malignant tumors are characterized by:
a. metastasis.
b. abnormal cell growth.
c. forming cell masses
d. specific mutations.
e. proto-oncogenes
A
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Which of the following species can be considered exotic in North America?
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Communities near benthic hydrothermal vents survive in perpetual darkness, where no photosynthesis
is possible. What do the producers of this ecosystem use as an energy source?
What will be an ideal response?If all offspring of a cross have the same
heterozygous genotype, the parents of the cross would most likely be
a. homozygous dominant and homozygous recessive. b. both heterozygous. c. heterozygous and homozygous recessive. d. homozygous dominant and heterozygous. e. both homozygous dominant.
Which of the following allows materials to diffuse
into body cells and allows organs to grow larger and move more freely? a. a coelom b. mesoderm c. a mantle d. a water-vascular system e. a saclike gut