Which of the following organisms would likely have the most complex nervous system?
a. sea turtle
b. sea anemone
c. earthworm
d. Portuguese man-of-war
A
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A gene pool is comprised of what?
A. all the genes in a population B. all the alleles within a population C. all the individuals within a population D. all the offspring within a population
Azolla filiculoides is a small aquatic fern that is typically 1-2 cm tall. How would a botanist distinguish it from a bryophyte?
A. It produces seeds. B. It has xylem tissue. C. It has a gametophyte. D. It has chloroplasts. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about ferns and bryophytes? What other information is related to the question? Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The hormone that is the basis of most pregnancy tests is
A. follicle-stimulating hormone. B. luteinizing hormone. C. human chorionic gonadotropin. D. estrogen. E. progesterone.
The antibiotic chloramphenicol binds to the 50S subunit of the ribosome as shown in Figure 20.3. The effect is to
a. Prevent attachment of tRNA. b. Prevent peptide bond formation. c. Prevent transcription. d. Stop the ribosome from moving along the mRNA. e. Prevent polypeptide formation in eukaryotes.