A substance that cannot be broken down into simpler substances by ordinary chemical or physical
techniques is a(n) ____.
a. molecule
b. chemical
c. compound
d. element
e. biological compound
D
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The first chemicals that provided potential energy on Earth may have been formaldehyde and hydrogen cyanide. While these were produced by sunlight-driven reactions, they also occurred around deep-sea vents. If the first organisms on Earth evolved around
these vents, the first life on Earth was _____. A) photosynthetic, obtaining energy from the Sun B) chemosynthetic, obtaining energy from chemicals C) herbivorous, obtaining energy from plants D) carnivorous, obtaining energy from animals
What are the base-pairing rules for DNA?
a. A-G, T-C c. A-U, C-G b. A-C, T-G d. A-T, G-C
What advantage do cDNA libraries have over genomic libraries?
What will be an ideal response?
What characteristics of plants allow them to be cloned relatively easily, whereas cloning in animals is rare and difficult to achieve?
What will be an ideal response?