Photosynthetic pigments in bacteria are located in the
A. cell wall.
B. chloroplasts.
C. plasma membrane.
D. plasmids.
E. nuclei.
Answer: C
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Osmoconforming animals, such as the spider crab, that live in the open ocean show little ability to withstand large variations in salinity, while coastal animals, such as the closely related fiddler crab, show great ability to withstand large salinity changes. Explain why this is the case, considering the relevant abiotic features of both habitats
What will be an ideal response?
The human skeleton is a typical vertebrate
A. exoskeleton. B. hydrostatic skeleton. C. axial skeleton only. D. endoskeleton. E. appendicular skeleton only.
When the cap of an average gilled mushroom is cut off and placed on paper, a spoke-like print eventually appears on the paper under the cap. This powdery material would be
A. mycelia. B. basidiospores. C. sporangiospores. D. hyphae. E. conidiospores.
Which of the following statements about T lymphocytes is FALSE?
A. T lymphocytes produce antibody molecules. B. T lymphocytes directly attack cells and produce the cell-mediated immune response. C. T lymphocytes mature in the thymus. D. T lymphocytes have TCRs that recognize unique antigens. E. T lymphocytes require antigen presentation to become activated.