Flatworms (Platyhelminthes) are ________ and typically have ________
A) radially symmetrical; no digestive system
B) bilaterally symmetrical; a gastrovascular cavity with one opening
C) bilaterally symmetrical; a complete digestive tract with a mouth and anus
D) all parasites; no digestive system
Answer: B
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Most protein synthesis happens on the surface of the ___________
A. rough endoplasmic reticulum D. mitochondrion B. smooth endoplasmic reticulum E. nucleus C. Golgi complex
If you were grading an exam about water, which statement would lose points?
What is the function of RNA polymerase?
A. It proceeds slowly along the DNA strand, requiring about a minute to add two nucleotides to the growing mRNA molecule. B. It unwinds the double helix and adds nucleotides to a growing strand of RNA. C. It adds nucleotides to the 5' end of the growing mRNA molecule. D.It relies on other enzymes to unwind the double helix. E. All of the above.
When a hormone inhibits its own expression, it is called a ____.
A. hormone stimulant B. hormone coordinator C. hormone suppressant D. negative feedback loop E. positive feedback loop