Dental plaque is an example of
A) an endospore.
B) a cell membrane.
C) a biofilm.
D) beneficial bacteria.
E) bacterial flagella.
C
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Which of the following molecules is not considered a porphyrin?
A. Hemoglobin B. Peptidoglycan C. Vitamin B12 D. Chlorophyll
In order for a tumor cell to metastasize, which of the following would you expect to happen?
A. a decrease in cadherin expression and an increase of integrin expression B. an increase of cadherin expression and a decrease in integrin expression C. an increase in both cadherin and integrin expression D. a decrease in both cadherin and integrin expression
The primary muscle(s) involved in human breathing is/are the ____
a. external intercostals
b. internal intercostals c. diaphragm d. abdominal wall e. lung
The interactions and exchange of energy between all feeding levels is known as a ________
A) food web B) feeding frenzy C) trophic level D) food succession