A group of plant geneticists discovers a mutant plant that has a deficiency in gibberellin production
All other hormones, including auxins, cytokinins, florigens, ethylene, and abscisic acid, are produced in normal quantities and are not directly affected by this mutation.
Based on this scenario, the mutant plant most likely exhibits
A) stomata that don't close.
B) a lack of gravitropism in the roots.
C) a lack of phototropism in the shoots.
D) a dwarf growth pattern (very short stem).
E) delayed senescence.
D
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Which of the following is the most advanced nervous
system? a. a diffuse system with scattered neurons b. an asymmetrical system c. a radially symmetrical system d. a system with paired nerves, paired sensory structures, and paired brain centers e. a nerve net
Scientists believe that mitochondria may have evolved from bacteria because ____
a. they both have cristae membranes b. mitochondria have their own DNA c. their shapes and sizes are exactly the same d. both are surrounded by a cell wall e. both can live independently
When a phosphate group is removed from an ATP molecule,
A.) a substantial amount of energy is released. B.) an enzyme if formed. C.) energy is stored. D.) a substantial amount of energy is used.
What kind of molecule is thought to have been the first genetic material?
a) DNA b) protein c) microsphere d) carbohydrate e) RNA