Which naturally-occurring plant hormone has a major role in the phototropic response of plants?
A. auxin
B. gibberellin
C. abscisic acid
D. ethylene
E. 2, 4-D
A. auxin
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Answer the following statements true (T) or false (F)
1. Friedrich Wöhler refuted the scientific concept of vitalism during the early 1800s by proving that organic molecules could be synthesized outside a living organism. 2. Because carbon and hydrogen share similar electronegativities, they will form nonpolar covalent bonds with each other. 3. Macromolecules such as lipids and carbohydrates are produced from monomers through condensation reactions. 4. The sole function of carbohydrates is to serve as energy stores.
Which of the following directly cause the
brain’s “thermostat” to raise the body’s internal temperature set point?
a. cytokines b. histamines c. prostaglandins d. histamines and prostaglandins e. complement proteins
Which of the following traits is NOT found in both fungi and animals?
A. multicellular B. consumers C. heterotrophic D. saprotrophic
A random alteration in the sequence of DNA nucleotides that provides a new variant allele is known as a
A. disruption. B. gene mutation. C. polymorphism. D. gene frequency.