Gram-positive bacteria have a
a. thin cellulose wall between two membranes.
b. thin peptidoglycan wall between two cell membranes.
c. thick cellulose wall outside the plasma membrane.
d. thick peptidoglycan wall outside the plasma membrane.
Ans: d. thick peptidoglycan wall outside the plasma membrane.
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How many water molecules are produced during the formation of a triglyceride from fatty acids and glycerol?
A. 0 B. 1 C. 2 D. 3 E. 4
Recall the classic experiments that Charles Keeling performed at Mauna Loa (Figure 25.1). What did Keeling's research reveal about atmospheric CO2 levels?
A. that atmospheric CO2 levels fluctuate seasonally B. that atmospheric CO2 levels are lowest during the spring C. that atmospheric CO2 levels remain constant throughout the seasons D. that atmospheric CO2 levels have decreased over the last 50 years E. All of the answers options are correct.
The conditions normally present in food such as moisture, acidity and nutrients are referred to as
A. extrinsic factors. B. intrinsic factors. C. endogenous factors. D. exogenous factors
Biologists divide mechanisms of reproductive isolation into
A. sexual and geographic. B. prezygotic and sexual. C. postzygotic and geographic. D. sexual and postzygotic. E. prezygotic and postzygotic.