Which one of the following incorrectly matches a molluscan structure with its typical function?
A. visceral mass-houses organs of digestion, excretion, reproduction
B. radula-feeding organ
C. ctenidia-secretion of the shell (when present)
D. foot-locomotion
E. nephrostome-collection of nitrogenous wastes
Answer: C
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Many medical studies include a control group in which patients receive a medically ineffective treatment that resembles the treatment tested. What do we call the ineffective treatment?
A. The hypothesis B. The controlled experiment C. The placebo D. The dependent variable
Which of the following characteristics do fungi share with plants?
a. Their cell walls both use cellulose to keep their structure. b. They both have chloroplasts. c. Their cells both have cell walls. d. Their plasma membranes are both stabilized by ergosterol.
Which of the following cells have reduced or very little active telomerase activity?
A) most normal somatic cells B) most normal germ cells C) most cancer cells
Imagine that you have been hired as a chemist and your first task is to examine a newly discovered atom. The paperwork you are given states that its atomic number is 110. What does this mean?
A) The atom contains 55 electrons. B) The atom contains 110 protons. C) The atom contains 55 protons and 55 neutrons. D) The atom is an isotope.