A(n) __________ is an extracellular signaling molecule that exerts its effect at very low concentrations. Fill in the blank(s) with the appropriate word(s)
ANSWER: plant hormone
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Organisms that live in aquatic systems experience limited temperature fluctuations due to water's
A) high specific heat. B) high viscosity. C) high surface tension. D) covalent nature.
In some jacana species, males take care of the eggs and young, and females compete among themselves for territories that contain one to several males. Female jacanas are significantly larger than males
Which of these statements would you predict to be true of this bird species? 1. Male jacana fitness is primarily limited by ability to take care of eggs and raise young. 2. Female jacana fitness is limited by the number of males in her territory with which a female mates. 3. Variation in reproductive success should be greater in male jacanas than in females. 4. Variation in reproductive success should be greater in female jacanas than in males. 5. Males and females have equal variation in reproductive success. A) 1 and 3 B) 2 and 4 C) 1, 2, and 4 D) 5
Which of the following statements best describes ribozymes?
a. Ribozymes are proteins that aid in the production of ribosomes. b. Ribozymes are nucleic acids that produce ribose sugars. c. Ribozymes store enzymes in ribosomes. d. Ribozymes process RNA molecules in eukaryotes.
Relatively small organic molecules with a central carbon atom which is bonded to a carboxyl group, an amino group, a carbon containing group, and a hydrogen atom are called:
A. amino acids. B. fatty acids. C. enzymes. D. peptides. E. nucleotides.