Earthworms have a mouth and an anus, but they also excrete liquid wastes. Through which of the following structures do they secrete nitrogenous and other wastes?
a. exosome
b. tube cell
c. nephridiopore
d. Malpighian tubules
c. nephridiopore
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Which statement exemplifies the biological pump concept?
A) Autotrophs bring in light photons to synthesize ATP. B) Bacteria oxidize Fe2+ into Fe3+, and Archaea reduce Fe3+ back into Fe2+. C) Calcium ions are brought into cells while toxic physiological byproducts are released. D) Primary producers sink to the deep ocean, which provides deep ocean organisms with nutrients when the primary producers die.
How is the human genome able to encode billions of unique antibody molecules from only three gene sets?
What will be an ideal response?
The chromosome in bacteria and archaea
A. forms a single linear strand of DNA. B. contains all the cell's plasmids. C. is located in the cell membrane. D. is part of the nucleoid.
Can two parents that have a genetic disorder ever have a normal child?
A. Yes B. No