Which type of epithelial tissue lines the air sacs and permits the exchange of gases?
A. columnar epithelium
B. cuboidal epithelium
C. pseudostratified columnar epithelium
D. stratified cuboidal epithelium
E. squamous epithelium
Answer: E
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Which of the following statements about the relationship between ants and acacia trees is/are accurate? Check all that apply.
_____ The ants protect the acacias from other insects. _____ The ants protect the acacias from epiphytic plants and vines. _____ The ants live in the hollow thorns of the acacias. _____ The ants are provided with sugar or other nutrition by some species of acacia. _____ The ants aid pollination of the acacias.
If two hyphae are compatible,
a. the hyphae and the nuclei remain separate. b. the hyphae and the nuclei fuse together. c. the hyphae fuse together and the nuclei remain separate. d. the hyphae remain separate and the nuclei fuse together.
Mismatch repair targets improperly paired nucleotides. In prokaryotes, the incorrect member of an abnormal base pair can be differentiated from the correct member because
A) the incorrect member has undergone a hydroxylation reaction. B) newly synthesized DNA contains uracil. C) the incorrect member doesn't match the surrounding bases. D) the original strand of DNA contains methylated bases while newly synthesized DNA does not; thus the correct member is in the methylated strand. E) the correct member has been deaminated.
An ‘x' in the figure above represents a(n):
a. extinction. c. species. b. clade. d. genera.