The number of hydrogen bonds between two molecules affects how much energy is needed to break those two molecules apart. The more hydrogen bonds there are, the more energy that is required. Which of the following base pairs requires the most energy to break apart?
A) A-T
B) T-A
C) G-C
D) A-U
Ans: C) G-C
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T cells attack
A. transplanted tissue cells from one host to another. B. cancer cells. C. host cells that have been parasitized by microorganisms. D. All of the choices are correct.
Which physical feature makes it possible for amniotes to be completely terrestrial?
a. their skin b. their lungs c. their eggs d. their four limbs e. their brains
Answer the following statements true (T) or false (F)
1.In bryophytes, the sporophyte is conspicuous or dominant. 2.A mushroom is a structure that is attached to a much larger growth form of the organism. 3.Molecular evidence places fungi closer to plants than to animals. 4.Molecular evidence places fungi closer to animals than to plants. 5.A yeast is a multicellular fungus.
The most common terrestrial animals are
A. birds. B. reptiles. C. mammals. D. insects.