Comparative embryology helped clarify the relationships among major groups of animals. The bilaterians, for example, can be divided into the _____ based on the developmental fate of the blastopore
A. protostomes and deuterostomes
B. coelomates and acoelomates
C. coelomates and pseudocoelomates
D. cnidarians and radiolarians
E. protostomes and coelomates
A
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In Pavlov's dog experiment, what were the original and conditioned stimuli?
A. original stimulus: food, conditioned stimulus: metronome B. original stimulus: saliva, conditioned stimulus: food C. original stimulus: metronome, conditioned stimulus: experimenter D. original stimulus: experimenter, conditioned stimulus: saliva E. original stimulus: metronome, conditioned stimulus: saliva
Plant cells called ____ form flexible support strands such as the "strings" in celery
a. sclerenchyma b. tracheids c. collenchyma d. parenchyma e. vessel members
What is the genetic makeup of an individual who has inherited Jacobs syndrome?
A. XXX B. XYY C. XXY D. XO E. none of these
In stage 1 of photosynthesis, a proton gradient is generated and ATP is synthesized. Where do protons become concentrated in the chloroplast?
(a) thylakoid space (b) stroma (c) inner membrane (d) thylakoid membrane