Which of the following organisms can use the process of lactic acid fermentation when oxygen concentrations are low?

a. yeast
b. plants
c. humans
d. fish


c. humans

Biology & Microbiology

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Signal molecules that determine relative positions during development are known as  

A.  inductors. B.  organizers. C.  cadherin domains. D.  derepressers. E.  morphogens.

Biology & Microbiology

A synapse is

A) a close association between neurons. B) a neurotransmitter molecule. C) a type of protein. D) a gene that controls the nervous system.

Biology & Microbiology

The exchange of genetic material during crossing over causes which of the following?

A) genetic variation B) stasis C) heterozygosity D) homozygosity

Biology & Microbiology

Scientists isolate cells in various phases of the cell cycle. They find a group of cells that have times more DNA than G1 phase cells. The cells of this group are _____

A) between the G1 and S phases in the cell cycle B) in the G2 phase of the cell cycle C) in the M phase of the cell cycle D) in the S phase of the cell cycle

Biology & Microbiology