Who invented the first crude microscope by grinding glass?
A. Pasteur
B. Schultz and Schwann
C. Redi
D. Lister
E. Leeuwenhoek
Answer: E
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Which of the following statements about stem cells is NOT accurate?
A. Stem cells can undergo mitosis. B. Some stem cells can differentiate into more than one type of specialized cell. C. Different types of stem cells vary in their potency. D. Stem cells are only found in embryos. E. Some stem cells can only differentiate into one cell type.
Which cells are found in lymph nodes to clear away bacteria and other unwanted substances?
a. T cells b. B cells c. dendritic cells d. macrophages e. platelets
What is a nerve?
A) a bundle of neurons B) a chain of neurons C) a sensory synapse D) a series of impulses
Which is not a component of the scientific method?
A. Careful observation. B. The construction and testing of hypotheses. C. Openness to new information and ideas. D. Submitting the result of your work for review by others only when you have won the Nobel Prize.