Examine Figure 44.7 in your text, paying attention to the phylogenetic position of sponges in the two phylogenies presented. If the hypothesis represented by the tree on the right is correct, as some molecular evidence suggests, (select all that apply)
A. sponges are monophyletic.
B. sponges are paraphyletic.
C. the common ancestor of all animals was
sponge-like in appearance.
D. we don't know what the common ancestor
of all animals looked like.
E. none of these.
B,C
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What will be an ideal response?
What is one reason why tumor-suppressor genes make poor druggable targets?
A) Cancer-causing mutations in tumor-suppressor genes result in loss of function. B) Mutant alleles of tumor-suppressor genes generally result in a greater activity of the protein, which makes inhibiting the proteins more difficult. C) Most drugs cannot distinguish the normal and mutant forms of the tumor suppressor proteins. D) Drugs that can target-tumor suppressor proteins are difficult to deliver to cancer cells.
All of the following are tenets of the cell
theory EXCEPT that a. all organisms consist of one or more cells. b. the cell is the smallest unit that retains the characteristics of life. c. since the first cell, each new cell is descended from previous cells. d. each cell is composed of products that it manufactures. e. cells may arise spontaneously under certain laboratory conditions
In a forest community, the upper layer is called the ________
Fill in the blank(s) with correct word