Some biologists believe that the process of endosymbiosis was responsible for the evolution of 

A. eukaryotic cells.
B. viruses.
C. prokaryotic cells.
D. fungi.


A. eukaryotic cells.

Biology & Microbiology

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A simple sugar is composed of equal parts carbon and water, which gave rise to the general name of any sugar as a ________.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

When do homologous chromosomes undergo recombination?

a. during anaphase b. during prophase c. during telophase d. during metaphase

Biology & Microbiology

A transport system that moves one solute into the cell and another one out of the cell during a single cycle accompanied by the expenditure of energy through ATP hydrolysis could be called a(n) _______

a) active uniport b) active antiport c) active symport d) passive symport e) passive antiport

Biology & Microbiology

Which option correctly describes the two strands of DNA in a double helix?

a. antiparallel in orientation b. parallel in orientation c. held together by covalent bonds between bases d. identical

Biology & Microbiology