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

Biology & Microbiology

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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

Biology & Microbiology

Plant cells called ____ form flexible support strands such as the "strings" in celery

a. sclerenchyma b. tracheids c. collenchyma d. parenchyma e. vessel members

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology