Which of the following molecules are biologically active?
A. L – sugars
B. L – amino acids
C. only amino acids that are optically inactive
D. only sugars that lack chiral centers
E. All of these molecules are biologically active.
B
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If the NaCl concentration drops below 1.5 M the cell walls of Halobacterium become more rigid.
Answer the following statement true (T) or false (F)
Archaeopteryx is an important link between
a. mammals and birds b. lizards and birds c. dinosaurs and birds d. crocodiles and birds e. non-flying birds and flying birds
To help identify phylogenetic relationships scientists use
To help identify phylogenetic relationships scientists use
Choose the letter of the best match from the following:A. hotspotB. habitat lossC. edge effectsD. megafaunal extinctionE. extinction vortexPrimarily due to habitat destruction, pollution, human disruption, fragmentation.
Fill in the blank(s) with the appropriate word(s).