The size and shape of habitat patches are determined more by the activities of animals than by the interaction of geology, topography, and climate
Indicate whether the statement is true or false
FALSE
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Which phrase would most likely be used in a discussion of homeostasis?
a. respond to environmental stimuli b. limited range of variation c. rapid energy turnover d. cycle of elements e. structural and functional units of life
Which of the following is NOT representative of endocrine glands?
A) They produce hormones. B) They drain into blood vessels. C) They have ducts. D) They drain into lymph vessels.
H. V. Wilson worked with sponges to gain some insight into exactly what was responsible for holding adjacent cells together
He exposed two species of differently pigmented sponges to a chemical that disrupted the cell-cell interaction (cell junctions), and the cells of the sponges dissociated. Wilson then mixed the cells of the two species and removed the chemical that caused the cells to dissociate. Wilson found that the sponges reassembled into two separate species. The cells from one species did not interact or form associations with the cells of the other species. How do you explain the results of Wilson's experiments? A) The two species of sponge had different enzymes that functioned in the reassembly process. B) The molecules responsible for cell-cell adhesion (cell junctions) were irreversibly destroyed during the experiment. C) The molecules responsible for cell-cell adhesion (cell junctions) differed between the two species of sponge. D) One cell functioned as the nucleus for each organism, thereby attracting only cells of the same pigment.
Which of the following can be used to estimate the number of microorganisms in a culture?
A. Measurements of microbial biomass B. Direct counts of microbial cells C. Counts of viable cells using colony growth procedures D. All of the choices are correct.