Alkylating agents, such as ethylmethane sulfate (EMS), are mutagens because they
A) promote deletions and insertions.
B) remove amine groups.
C) add hydroxyl groups to bases.
D) add ethyl or methyl groups to bases.
E) fit between stacked bases and disrupt replication.
D) add ethyl or methyl groups to bases.
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If current changes in ocean temperature and pH caused a mass extinction of today's reefbuilding organisms,
A. we would see an unprecedented mass extinction, unlike anything the earth has experienced in the past. B. we would see one more in a series of mass extinctions that have wiped out reefs at least 3 times since the first reefs appeared over 500 million years ago. C. we would see one more in a series of mass extinctions that have wiped out reefs at regular intervals – roughly every 10 million years since the first reefs were formed over 500 million years ago. D. we would see the second great mass extinction of reefs; the only previous such extinction took place at the end of the Permian. E. none of these
In secondary active transport, when both the driving ion and the transport ion are in high concentration outside of the
cell, in which direction will the two ions move?
a. As the driving ion moves in, the transport ion moves inb. As the driving ion moves in, the transport ion moves out c. As the driving ion moves out, the transport ion moves in d. As the driving ion moves out, the transport ion moves out e. As long as both ions are moving together, they can go either in or out
Cell differentiation can be defined as
a. protein synthesis. b. different cell lineages expressing different subsets of their genes during development. c. all cell lineages expressing the same genes during development. d. different cell lineages expressing all subsets of their genes during development.
e. different genomes present in different cell lineages.The Sahara Desert and the Negev Desert belong to the same ________
A) community B) savanna ecosystem C) biome D) temperate grassland