Which of the following represents the chemical formula for urea?

a. H2N-CO-NH2
b. NH4Cl
c. NH3
d. C5H4N4O3


a. H2N-CO-NH2

Biology & Microbiology

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The evolutionary relationships between the eukaryotic supergroups are depicted in the diagram.Which of the following pairs of protists would be most closely related due to both of them possessing plastids?

A. archaeplastids & rhizaria B. archaeplastids & stramenopiles C. amoebozoans & excavates D. rhizaria & amoebozoans

Biology & Microbiology

All of the following are tests used to identify Helicobacter pylori EXCEPT:

A) polymerase chain reaction B) urease C) enzyme immunoassay D) DNase

Biology & Microbiology

There are several species of plain-looking, brownish-gray moths that, when they spread their wings, have large bright red or orange eye-shaped circles on their hind wings

What is this adaptation called, and what advantage does it give to the moth?

Biology & Microbiology

During the elongation stage of translation, _____ are formed between _____.

A) covalent bonds, phosphate groups B) phosphate bonds, nucleotides C) hydrogen bonds, base pairs D) peptide bonds, amino acids

Biology & Microbiology