Science
What will be an ideal response?
as knowledge about the natural world.
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Efforts to define the last universal common ancestor (LUCA) currently estimate 80–500 genes are shared by all known species. The lower value of 80 was estimated by determining the number of:
A. mRNAs species produced in LUCA. B. genes coded by LUCA genome. C. genes in simplest bacterial species. D. clearly identifiable orthologs in all organisms. E. genes required for processes that are found in all organisms.
Repressor proteins
a. prevent binding of RNA polymerase to DNA. b. cause the DNA regions that contain the operator to twist or loop. c. inactivate operon genes when their products are not required. d. bind to sets of operators. e. do all of these.
Which of the following is NOT true of the chytrids?
a. They belong to the most ancient lineages of fungi. b. Their flagellum is similar to eukaryotes. c. They form non-flagellated spores and gametes. d. They reflect the origin of the fungi in aquatic habitats. e. They are associated with serious diseases in various vertebrates.
In humans, the allantois:a
stores embryonic nitrogenous wastes. b. eliminates nitrogenous wastes from the embryo. c. contributes to the formation of the blood vessels in the umbilical cord. d. secretes amniotic fluid. e. serves as a temporary center for formation of blood cells