The first cells were most likely heterotrophic anaerobes because:a
they were dependent upon cyanobacteria for oxygen.
b. they manufactured organic molecules and needed oxygen.
c. they manufactured organic molecules and do not need oxygen.
d. they utilized preformed organic molecules and needed oxygen.
e. they utilized preformed organic molecules and did not need oxygen.
E
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It has been difficult to generate drugs to treat AIDS for which reason?
A. HIV does not cause AIDS. B. HIV does not use any enzymes that can be targeted by drugs. C. HIV mutates rapidly. D. The only way to kill a virus is with a vaccine, not with drugs. E. People with HIV infections die rapidly, before the drugs have a chance to cure them.
Chloroplasts and mitochondria are thought to be of prokaryotic origin. One piece of evidence that supports this hypothesis is that these organelles contain prokaryotic-like ribosomes. These ribosomes are probably most similar to ribosomes found _______.
Fill in the blank(s) with the appropriate word(s).
Prader-Willi and Angelman syndromes both arise from the same area of chromosome 15, illustrating
A) epistasis. B) X inactivation. C) genomic imprinting. D) behavior modification.
Compared to other mammals, the human brain is unique with respect to its ____
a. integrative capacity only b. degree of complexity only c. pathway of embryonic development only d. integrative capacity and degree of complexity e. integrative capacity, degree of complexity, and pathway of embryonic development