Which of the following could not be considered a secondary tissue?
a. xylem
b. phloem
c. epidermis
d. periderm
e. cork
C
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The three phylogenetic trees above all contain the same members, all have a common ancestor, but are divided up in three different ways. Which tree has members circled that are of several evolutionary lines and does not include the most recent common ancestor of the included lineages? What is this type of group is this?
A. Tree 3; polyphyletic.
B. Tree 2; polyphyletic.
C. Tree 1; monophyletic.
D. Tree 3; monophyletic.
E. Tree 2; paraphyletic.
Depolarization of the neuronal plasma membrane occurs due to ____
a. the diffusion of K+ into the cell b. the diffusion of K+ out of the cell c. the diffusion of Na+ into the cell. d. the diffusion of Na+ out of the cell e. closed gated channels
In a sequenced genome, candidate protein-encoding genes are identified by searching for
A) STRs. B) RFLPs. C) ESTs. D) SNPs. E) ORFs.
Explain why a life cycle that includes meiosis must also include fertilization. What is the advantage of such a life cycle?
What will be an ideal response?