Which of these cell surface proteins interact directly with antigens during the adaptive immune response?
a. immunoglobulins
b. T cell receptors
c. MHC proteins
d. all of the above
Answer: D
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The theory that modifications in an individual caused by the use or disuse of a structure could be inherited by its offspring to bring about changes to the species, is also referred to as which of the following?
a. descent with modification b. natural selection c. inheritance of acquired characteristics d. natural transformation
What is it called when members of the same species vie for the same resources?
a. interspecific competition b. predation c. intraspecific competition d. commensalism
The structure shown in the accompanying figure is from an animal in phylum:
a. Cestoda.
b. Turbellaria.
c. Trematoda.
d. Monogenea.
e. Platyhelminthes.
Which statement is NOT true about vascular tissue in plants?
A. Xylem cells are hollow and nonliving, and they form a continuous pipeline that transports water and minerals. B. In stems, the vascular tissue is found in the vascular bundles. C. Phloem cells are hollow and nonliving, and they form a continuous pipeline that transports sugars. D. In roots, the vascular tissue is found in the central vascular cylinder. E. In leaves, the vascular tissue is found in the leaf veins.