What was Pasteur's purpose in using a swan-necked flask rather than a traditional Erlenmeyer flask for his experiments on spontaneous generation?
a. to prevent air from entering
b. to be able to boil and sterilize the liquid medium
c. to prevent large debris and microbes from entering
d. all of the above
Answer: C
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Which of the following is TRUE of ligand-gated ion channels?
A. They bind ions with high affinity. B. They tend to allow any ion to pass through the channel. C. The intracellular domain of the channel contains the binding site for the ligand. D. They open upon binding the ligand to allow specific ions to pass through them. E. Ligand binding closes the channels preventing further ion passage through the channel.
Why is it difficult to find intermediate fossils for organisms that have evolved under the punctuated equilibrium
model?
What will be an ideal response?Which body system is least likely to be damaged by exposure to mercury?
a. Liver b. Skin c. Kidneys d. Brain e. Nervous system
A true body cavity completely surrounded by __________ is called a coelom
a. ectoderm b. mesoderm c. endoderm d. exoderm e. mesoglea