The bonding of two amino acid molecules to form a larger molecule requires the _____

A) release of a water molecule
B) release of a carbon dioxide molecule
C) addition of a carbon dioxide molecule
D) addition of a water molecule
E) addition of a water molecule and a carbon dioxide molecule


Answer: A

Biology & Microbiology

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Gene silencing refers to:

A. repression of gene expression by the absence of activator proteins. B. repression of gene expression by the presence of repressor proteins. C. the absence of gene expression due to its location in the genome. D. All of the choices are correct.

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Fats are major constituents of ____

a. proteins b. genes c. photosynthesis d. cell membranes e. nucleic acids

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If molecules are taken into the cell and encased in a single membrane sac called a vacuole, the transport method used is most likely 

A. diffusion. B. osmosis. C. active transport. D. endocytosis.  

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The lineage that first separated from the common ancestor of all animals, and retains many of the same primitive features to this day, includes which of the following modern organisms?

a. The grasshopper b. The sea turtle c. The jellyfish d. The sponge e. The earthworm

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