Each human kidney contains about a million ________, which are the tubular functional units of the kidney.
A. renal medullae
B. nephridia
C. ureters
D. nephrons
E. flame cells
Answer: D
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The incidence of cancer in people living within 100 yards of overhead power lines is recorded. This would be an example of what type of epidemiological technique?
A) ecological study B) cross-sectional survey C) cohort study D) correlational experiment
How do cells become differentiated?
a) Different genes are expressed so that different proteins are produced. b) Paternal effect genes begin the process of differentiation by providing positional information. c) They differentiate through the process of mitosis. d) Some cells contain maternal chromosomes and some contain paternal chromosomes. e) The DNA in each cell changes so that the appropriate proteins are produced.
The digestive enzyme pepsin works in the acidic environment of the stomach to hydrolyze peptide bonds in ________.
A. carbohydrate B. lipid C. DNA D. protein
Which of the following statements is false?
A. tissues exist within organs which exist within organ systems B. communities exist within populations which exist within ecosystems C. organelles exist within cells which exist within tissues D. communities exist within ecosystems which exist in the biosphere