One disadvantage of the direct microscopic count method of determining cell numbers is that:
a.it is an indirect method
b. it cannot differentiate between live and dead cells
c. it can detect only viable cells
d. the orifice gets clogged frequently
Answer: b. it cannot differentiate between live and dead cells
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In the logistic growth model, as population size increases, birth rates
A) remain constant and death rates increase. B) decline but death rates remain steady. C) and death rates increase. D) and death rates remain steady. E) rates decline and/or death rates increase
Why doesn't a tapeworm have a mouth on its scolex?
A. The mouth is on the proglottids. B. The mouth is located at the end of the pharynx. C. Tapeworms use a radula instead of a mouth to feed. D. Endoparasites don't need a mouth.
Type of bonding in which an atom loses or gains electrons:
A) Ionic B) Covalent C) London D) Hydrogen
A friend tells you that he is going on a low-carb diet to lose weight because he thinks that carbs contain more energy than fats or protein. What would you tell your friend about his plan?
A) This is a good idea because sugars enter the fuel breakdown pathway earlier than other food molecules. B) This is a good idea because sugars have more electrons than fats and protein. C) This is a bad idea because fats contain more hydrogen atoms than carbohydrates and protein. D) This is a bad idea because all food molecules store the same amount of energy.