Which of the following is NOT a commonly used energy carrier in the cell?
A) ATP B) NAD C) H2O D) FAD
C
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The openings in leaves that function to exchange gases are called:
a. cuticles b. stomata c. guard cells d. pits e. pores
What is meant by the "beads on a string" model of chromatin?
A) The beads are the histones, and the string is the transcriptionally active DNA loops. B) The beads are the nucleosomes, and the string is the linker DNA. C) The beads are molecules of DNA polymerase that attach to the DNA string. D) The beads are ribosomes, and the string is the mRNA that has been transcribed from active chromatin. E) The beads are the heterochromatic regions that are tightly compacted, and the strings are euchromatic regions that are being actively transcribed.
Altogether, the body secretes about 7 liters of water into the alimentary canal each day. About what percentage of this water gets reabsorbed?
A) 30% B) 50% C) 60% D) 90%
What is the major cost to plants for having cuticle-covered epidermis in the shoot system to reduce water loss?
a. reduced oxygen uptake b. reduced nitrogen uptake c. reduced carbon dioxide uptake d. reduced potassium uptake