One common secondary protein, the alpha helix, forms coils like those seen here. this secondary protein structure can be found in keratin, a component of hair. how are these coils of proteins held together? a) by van der waals interactions eliminate b) by h-bonding between every 4th amino acid c) by oxygen and nitrogen atoms of the backbone that are electronegative d) by the interactions between side chains (r groups) of various amino acids

Which of these best describes what occurs during cytokinesis? a) the chromosomes are separated b) the cell begins to divide by replicating the chromosomes c) the cytoplasm is divided between the two new daughter cells d) the nucleus opens to allow the chromosomes to enter the cytoplasm

In a classic experiment using pea shape, mendel conducted two separate genetic crosses. in the first cross the parent plants were “true breeding” for pea shape; one had round peas ( r )and the other had wrinkled (r). the first cross produced a filial 1 generation of all round peas. in the second cross, mendel bred plants from the filial 1 generation. this cross produced different results. out of approximately 1000 plants, about 75% were round and 25% were wrinkled.

Which law represents a balanced chemical equation?