In the pearl-millet plant, color is determined by three alleles at a single locus: Rp1 (red), Rp2 (purple), and rp (green). Red is dominant over purple and green, and purple is dominant over green (Rp1 > Rp2 > rp). What will be expected phenotypes and ratios of offspring produced by the Rp1/rp × Rp2/rp crosses?

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#Question id: 55

#Section 2: General Biology

The standard free energy change for the reaction A → B is −15.0 kJ · mol−1. What is the equilibrium constant for the reaction at 25°C?

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#Question id: 56

#Section 2: General Biology

Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by humans and other vertebrates, but not by other organisms such as bacteria or plants?

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#Question id: 57

#Section 2: General Biology

A(n) ________ has charge but negligible mass, whereas a(n) ________ has mass but no charge.

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#Question id: 58

#Section 2: General Biology

A covalent chemical bond is one in which ________.

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#Question id: 59

#Section 2: General Biology

Nitrogen (N) normally forms three covalent bonds with a valence of five. However, ammonium has four covalent bonds, each to a different hydrogen (H) atom (H has a valence of one). What do you predict to be the charge on ammonium?

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#Question id: 60

#Section 2: General Biology

Which of the following is true for the reaction?

3H₂ + N₂   2NH₃