Fossil evidence indicates that the maker of stone tools found at Olduvai Gorge in Africa was probably ________
a. Homo habilis
b. Homo erectus
c. Homo sapiens
d. Homo heidelbergensis
b
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Future kidney cells and heart cells can differentiate into their respective specialized cell types because
A. they express a different set of genes during development B. they possess different genes C. they arise from different embryonic stem cells D. they utilize different transcription factors E. they express different genes and utilize different transcription factors during development
The domains that contain prokaryotes are
A. Archaea, Bacteria, and Eukarya. B. None of the answer choices is correct. C. Archaea and Eukarya. D. Archaea and Bacteria. E. Bacteria and Eukarya.
An individual mixotroph loses its plastids, yet continues to survive. Which of the following most likely accounts for its continued survival?
A) It relies on photosystems that float freely in its cytosol. B) It must have gained extra mitochondria when it lost its plastids. C) It engulfs organic material by phagocytosis or by absorption. D) It has an endospore.
Sickle cell anemia is caused by a defect in the
A. ability of red blood cells to fight infection. B. chloride ion transport protein. C. ability of the blood to clot. D. oxygen-carrying pigment hemoglobin.