Birds store food in a modified portion of the lower esophagus called the
A. crop.
B. epiglottis.
C. gizzard.
D. alimentary canal.
E. pharynx.
A. crop.
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Which of the following amino acids is a target for phosphorylation by a protein kinase?
A. Tyr B. Ala C. Arg D. Gly
Which statement is false?
a. A molecule must be made of at least two atoms. b. Compounds are made of elements. c. Two atoms of oxygen make a molecule of oxygen. d. Chemical bonds form between molecules of solute and solvent. e. Elements are found in compounds and molecules.
Molecules of life include which one of the following?
A) water, proteins, lipids, nucleic acids, carbohydrates B) proteins, saturated fats, monosaccharides, but not polysaccharides C) lipids and proteins only D) any noncarbon base molecule E) nonsugar carbohydrates, proteins, lipids, water
Which of the following is the correct evolutionary sequence?
A. birds ? reptiles ? fish ? amphibians B. fish ? birds ? amphibians ? reptiles C. reptiles ? birds ? fish ? amphibians D. amphibians ? fish ? reptiles ? birds E. fish ? amphibians ? reptiles ? birds