Summarize the effects of each of the six classes of plant hormones
What will be an ideal response?
Concepts to Consider: Auxins promote cell elongation, tropisms, apical dominance, and
fruit development; gibberellins promote stem elongation, flowering, and germination;
cytokinins promote mitosis and differentiation, delay senescence, and are involved in apical
dominance; ethylene aids in the ripening of fruits, promotes apical dominance,
thigmomorphogenesis, and leaf abscission; abscisic acid is an environmental stress hormone
that causes stomatal closing and prevents seed germination in undesirable conditions;
brassinosteroids affect many developmental processes such as cell division, cell elongation,
light-induced differentiation, vascular development, and seed germination.
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The concept of a molecular clock allows a population geneticist to estimate what?
A. how quickly mutations are occurring in all species B. how long two populations of the same species have been separated C. how frequently beneficial mutations will appear in a population D. how large a population is
You are studying a histone complex that contains an unusually high level of modification with acetyl groups. What can you conclude about the DNA bound to this histone complex?
A) It contains actively transcribed genes. B) It is most likely heterochromatin. C) It is most likely telomeric. D) It is most likely derived from a condensed Barr body.
Which of the following is common to both photosynthesis and aerobic respiration?
a. NADP+ and NADPH b. glycolysis c. chemiosmosis d. CO2 and O2 as end products e. thylakoids
This environment is characterized by high nutrient inputs and by relatively great fluctuations in
salinity and temperature:a. a river. b. an estuary. c. a freshwater wetland. d. a large lake. e. the oceanic province.