Your friend examines an ivy vine growing on the side of a campus building and says, "Look - some of the branches on this plant have a different morphology. The leaf shapes and patterning are different, and there are flowers on some branches but not others. There must have been a mutation!" You respond,
A. "No, those branches have just undergone phase change. Now they're in the adult form, and have become competent to respond to flowering signals."
B. "No, those morphological changes are just evidence that this plant's environment has changed during its lifetime."
C. "I think you're right. Maybe there was a mutation in the LEAFY (LFY) gene, and the loss of LFY has promoted flowering and had pleiotropic effects on leaf morphology."
D. "I think you're right. Maybe the embryonic flower (emf) gene is being overexpressed, and that's causing flowers to form."
Answer: A
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Gibberellins
a. were first isolated by a Japanese researcher working with “foolish seedling” rice plants. b. were first isolated from a fungus. c. are represented by more than 80 different types. d. promote stem elongation. e. include all of these descriptions.
These types of compounds are a group of unrelated organic molecules, either water-soluble or fat-soluble, used in the manufacture of final products by acting as coenzymes.
A. phosphates B. acids C. vitamins D. enzymes
What compound directly provides energy for cellular work?
A) sugar
B) ATP
C) DNA
D) fat
In trying to measure the "treatment effect" of taking Tylenol on reducing your "next day's temperature from today", and given the fact that you only take Tylenol when you're feeling sick, which of the following conditions are likely?
A. ETT = ATE B. Selection Bias > 0 C. Selection Bias < 0 D. ETT > ATE