How would an earthworm stretch its body to reach a patch of dirt after crossing a hot sidewalk?
A. Relaxing the chaetae (setae)
B. Contraction of the longitudinal muscles
C. Contraction of the circular muscles
D. Pulling on the chaetae (setae)
Answer: C
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Four of the five features listed below are
characteristic of bilaterally symmetrical organisms. Select the exception. a. sessile, nonmoving b. three germ layers c. cephalization d. paired nerves, muscles, sensory structures e. right and left halves of the body
Hemoglobin
a. tends to give up oxygen in regions where partial pressure of oxygen exceeds that in the lungs. b. tends to hold onto oxygen when the pH of the blood drops. c. tends to release oxygen where the temperature is lower. d. releases oxygen more readily in highly active tissues. e. may bind up to 16 molecules of oxygen.
Which of the following is not true of the enzyme–substrate interaction?
A) Many enzymes are extremely specific regarding a substrate. B) Many enzymes cannot recognize a stereoisomer of their substrate. C) Some enzymes accept any of a whole group of substrates. D) Carboxypeptidase recognizes any of the amino acids from the carboxyl end of a polypeptide. E) Cells are often able to carry out metabolic activity with only a handful of enzymes because many are nonspecific.
The muscle and bone tissues of adults are derived from the embryonic tissue layer called the ________
Fill in the blank(s) with correct word