What key words does the question contain and what do they mean?
What will be an ideal response?
Outer shell of electrons – an atom is most stable with a full outer shell of electrons. It can obtain this by gaining or losing electrons.
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Recent studies on the evolutionary divergence of seed plants from seedless vascular plants used the genome of a ____,
a lycophyte, as a comparison for genomes of the more derived land plants.
a. numerous, large apical cells on the edges of their fronds b. single, large apical cell on the tip of their fronds c. single, large apical cell at the tip of their apical meristems d. numerous, small apical cells at the base of their apical meristems e. single, small apical cell at the base of their apical meristems
How many protons are in the nucleus of a
phosphorus atom?
a. 5 b. 7 c. 10 d. 15 e. 30
________ were the first vertebrates to live on land and they evolved from ________.
A. Mammals; reptiles B. Reptiles; amphibians C. Amphibians; fish D. Amphibians; lancelets
Antibodies are proteins produced by the body. Antibiotics are prescription medications that can kill or inhibit the growth of microorganisms. How are antibodies different from antibiotics?
A) Unlike antibodies, antibiotics are useful against all pathogens. B) The body depends on antibodies, but not antibiotics, as its first line of defense. C) Unlike antibiotics, antibodies can help protect the body against viral pathogens. D) The body can make antibiotics, but not antibodies.