The process in which mutations are removed and replaced with the correct bases is called
A. transduction.
B. back mutation.
C. transformation.
D. excision repair.
E. frameshift.
Answer: D
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One characteristic of life and living systems is that they are able to adapt. In general, cells interact with other cells and their environment through the action of their _____
A) plasma membrane and extracellular matrix B) microtubular tracks C) hormones D) intracellular electrical currents
The cell maintains a ratio of ATP to ADP that is at the equilibrium point
__________________ Indicate whether the statement is true or false.
Different scientists have speculated about how the first living thing appeared on Earth. All of the following are supported by evidence EXCEPT
A. origin on Earth of a photosynthetic autotroph. B. origin on Earth of a chemosynthetic autotroph. C. origin on Earth of an anaerobic heterotroph. D. an organism arrived from an extraterrestrial source.
Why doesn't a tapeworm have a mouth on its scolex?
A. The mouth is on the proglottids. B. The mouth is located at the end of the pharynx. C. Tapeworms use a radula instead of a mouth to feed. D. Endoparasites don't need a mouth.