Compared to a hydrocarbon chain where all the carbon atoms are linked by single bonds, a hydrocarbon chain with the same number of carbon atoms, but with one or more double bonds, will _____
A) be more flexible in structure
B) be more constrained in structure
C) be more polar
D) have more hydrogen atoms
B
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Plant species are capable of attracting insects using chemicals. How can this aid in defense?
A. Some plant species attract pollinators. B. Some plant species attract insects that consume or parasitize herbivores. C. Some plants have inducible defenses that they produce only when herbivores are feeding on them. D. Some plants produce spines for defense. E. Some plant species are unable to defend themselves.
A scientist is searching for chemical compounds involved in embryonic limb development. He discovers a new compound that is transiently expressed in the limb, and only seems to affect cells in its immediate vicinity (up to a few cell lengths away)
How should the scientist classify this chemical compound? A. as an amine hormone B. as a peptide hormone C. as a steroid hormone D. as a paracrine factor E. as a neurotransmitter
Which fossil would you expect to be found in
the deepest layers of the Earth?
a. dinosaur b. monkeys c. frogs d. bacteria e. all of these would be at the same level
Photoautotrophs use the energy stored in the products of photosynthesis directly to run the diverse reactions that sustain life
1.True 2.False