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Which electron carrier is/are used in the Krebs cycle?

Refer to the DNA double helix. The two polynucleotide strands are held together by ___ bonds.

Which part of the phospholipid is made of nonpolar fatty acid tails?

Refer to the structural formula of glucose.   How many carbon atoms does glucose have?

Match the labeled structures in the prokaryotic cell with the description. The flagella allows cell movement. [a] The pili allows the cell to attach to surfaces. [b]  

When oxygen is absent in muscle cells pyruvate is reduced to ___.

Which part of the integral membrane protein is hydrophobic?

This protein secondary structure is called ___.

The First Law of Thermodynamics states: “The total energy of the universe is ___.

Molecules, such as phospholipids, that have both polar and nonpolar groups are described as ___.