Flatworms are most closely related to the ________.
A. annelids
B. roundworms
C. sponges
D. cnidarians
Answer: A
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What can be determined about proteins using mass spectrometry?
A. the native charge of the entire protein B. the amino acid sequence of short regions within a protein C. the molecular weight of the entire protein D. the function of a protein E. None of the choices are correct.
How do scientists propose that coconuts traveled from tropical locales to Hawaii?
a. by air b. by birds c. by humans d. by wind
The pancreatic secretions governing glucose levels are precisely controlled by
a. neural connections to the pancreas. b. the blood-brain barrier. c. cooperative interactions. d. homeostatic feedback loops. e. releasing factors.
Answer the following questions true (T) or false (F)
1. During cleavage, the vegetal pole of a frog egg contains larger cells than the animal pole. 2. The lenses of the eye are produced from the endoderm. 3. Bicoid mRNAs are produced by the zygote.