Coral reefs, atolls, and islands are the result of the buildup of coral
a. polyps.
b. medusae.
c. exoskeletons.
d. wastes.
c
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The origin of the mitochondrion and chloroplast by endosymbiosis, hypothesizes that these organelles originated by
A. the fusion of two archean cells to form the eukaryote with the eukaryotic mitochondrion and chloroplast inside. B. the absorption of RNA from prokaryotic cells. C. prokaryotic cells being engulfed and becoming internal symbionts within an early eukaryotic cell. D. only the absorption of DNA from dead prokaryotic cells used as food. E. prokaryotic cells being engulfed and becoming external symbionts within an early bacteria cell.
According to the endosymbiont hypothesis,
a. most of the genes from the endocytosized bacteria moved to the nucleus. b. the host anaerobe became dependent on the endocytosized bacteria. c. the endocytosized bacteria became dependent on the host cell. d. the endocytosized bacteria were all photosynthetic. e. most of the genes from the endocytosized bacteria moved to the nucleus, the host anaerobe became dependent on the endocytosized bacteria, and the endocytosized bacteria became dependent on the host cell.
What are the two types of nucleic acid?
a. mRNA and tRNA b. mDNA and rRNA c. DNA and RNA d. none of the above (there is only one type of nucleic acid and it is DNA)
Which of the following is the most basic level of chemical organization?
a. cell b. molecule c. atom d. tissue e. organism