This animal has a pseudocoelom, is
unsegmented, a cuticle, and no circulatory
system. This animal is ___.
a. a roundworm
b. an earthworm
c. a flatworm
d. a leech
e. more than one of these
A
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You may have heard the advice to “eat low on the food chain.” Explain how choosing a soybean-protein “burger” rather than a beef burger for lunch is energy efficient with respect to energy flow and utilization in trophic levels.
What will be an ideal response?
In final preparation for a climb up Mt. Everest, climbers take up residence at base camp for a period of days to weeks before the climb. During this time, the climbers must acclimate physiologically to the low oxygen levels. Out of a group of ten climbers, one is unable to acclimate to the low oxygen levels, so he cannot make the final part of the climb. What would explain his lack of acclimation?
A. The levels of erythropoietin in his system are too low. B. The levels of hemopoietin in his system are too low. C. The levels of renin-angiotensin in his system are too low. D. The levels of adrenocorticotropin in his system are too low.
Which of the following carries amino acids to
ribosomes, where amino acids are linked into the primary structure of a polypeptide? a. mRNA b. tRNA c. hnRNA d. rRNA e. all of these
Differentiation produces cells in the body with different appearances and capabilities because:
A) different cells have different mutations B) different cells use different sets of genes C) cells migrate to locations where they are needed D) different cells possess different genes E) different cells are in different parts of the body