Which of the following have thick secondary cell walls strengthened with lignin, and support plants like steel beams in a building?
A) parenchyma cells
B) collenchyma cells
C) sclerenchyma cells
D) water-conducting cells
C
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Eukaryotes have ____ type(s) of RNA polymerase.
A. two B. three C. four D. one E. 64
Which of the following describes a trophoblast?
a. the outer layer of blastocyst cells b. a combination of Z and W chromosomes c. the inner layer of blastocyst cells d. a fertilized egg retained in the female
Exotic species that are introduced into a non-native
habitat can a. interbreed with native species. b. drive endemic species to extinction. c. die out due to competition from native species. d. blend in with endemic species. e. create habitat islands for themselves.
Which is the correct arrangement of the components of a nucleotide in a strand of DNA?
A. Bases pair up inside with phosphates and sugars on the outside. B. Phosphates and sugars pair up on the inside with bases pointing to the outside. C. Phosphates, sugars, and bases alternate in a single linear molecule like beads on a string. D. Bases connect with sugars on the inside and phosphate groups are on the outside. E. Phosphates connect on the inside while sugars and bases connect to each other on the outside.