Which of the following would be true of an epithelium specialized for exchange by diffusion (e.g., a respiratory epithelium)?
A. thin with a relatively large surface area
B. thick with a relatively large surface area
C. thin with a relatively small surface area
D. thick with a relatively small surface area
E. thin with a small surface area/volume ratio
A. thin with a relatively large surface area
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A survivorship curve shows
(a) the number of individuals surviving to a particular age. (b) the cause of death of an individual. (c) the place an organism exists in its environment. (d) the organism’s trophic level.
The oral cavity of humans normally becomes colonized with microorganisms within hours after birth.
Answer the following statement true (T) or false (F)
The Kaibab limestone layer of sedimentary rock is the closest to Earth’s surface; therefore ____
a. it contains fossils of extinct species only b. it contains the greatest density of fossils c. it is part of the K-Pg boundary sequence d. it is the oldest layer e. it is the youngest layer
Expansins are proteins that loosen up cell walls so cells can elongate. Auxin is thought to activate expansins by
A) aligning cellulose microfibrils. B) activating protons pumps to decrease pH in a section of the cell wall. C) depositing lignin molecules between cellulose fibrils. D) increasing turgor pressure. E) increasing pectin hydration.