Secondary xylem contains all of the following cell types except:a
tracheids.
b. vessel elements.
c. sieve tube elements
d. fibers.
e. parenchyma
C
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What would result from a single nucleotide deletion (point mutation) within the coding sequence of a structural gene?
A. a silent point mutation with no deleterious effects B. a missense point mutation resulting in the change of one amino acid C. a nonsense point mutation resulting in the generation of a premature stop codon D. a frameshift mutation, producing a different amino acid sequence altogether E. All of the choices are possible.
The degeneration of nuclei is occurring in step(s)
a. 4. b. 5. c. 8. d. 4 and 5. e. 4 and 8.
The images above of a yellow jacket and a nonstinging wasp are an example of ____
a. mimicry b. display behavior c. warning coloration d. chemical defenses e. camouflage
The splitting of water and the generation of oxygen occur where?
A. photosystem II B. the Krebs Cycle C. photosystem I D. the Calvin Cycle