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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

What advantage do cDNA libraries have over genomic libraries?

What will be an ideal response?

Biology & Microbiology

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?

Biology & Microbiology