A key disadvantage to having an exoskeleton is ____
a. muscles do not work effectively
b. the body tissues are unprotected by it
c. it does not grow with the animal
d. it prevents the possibility of flying
e. it breaks easily
ANSWER: c
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A(n) ________ solution is one that contains a solute concentration that is ________ than that within the cell and results in the "bursting" of the cell.
Fill in the blank(s) with the appropriate word(s).
Karl Popper suggested that scientists use "imaginative preconception," which means that successful scientists:
A. do not keep records of experiments that fail. B. do not need to do experiments to test their ideas. C. only perform applied research. D. often predict the outcome of experiments. E. cannot predict the outcome of experiments.
Dialysis is a treatment used for patients who no longer have functioning kidneys. The dialysis machine uses ultrafiltration with a semi-permeable membrane to perform the functions of the kidneys. After dialysis, patients sometimes experience periods of hypoglycemia (low blood sugar). Which of the following is an explanation for this post-treatment condition?
a. Dialysis takes a long time and patients need a break to eat. b. Without kidneys, their bodies cannot retain sugar in their blood. c. During dialysis, there is loss of glucose due to diffusion. d. Dialysis causes their insulin levels to rise.
The Lake Erie ecosystem was affected by humans because human activities
a. extracted resources without replacement. b. caused global warming. c. used the water without replacement. d. disrupted energy flow and the cycling of nutrients. e. extracted energy without replacement.