Prokaryotes, such as bacterial cells, differ from eukaryotes in that eukaryotes
A. have a simpler structure relative to prokaryotes.
B. possess membrane-bound organelles.
C. are relatively small compared to prokaryotes.
D. lack a membrane-bound nucleus.
E. store most of their DNA within the cytoplasm.
Answer: B
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The strongest chemical bonds are
A. hydrogen bonds. B. Van der Waal forces. C. hydrophobic interactions. D. ionic bonds. E. covalent bonds.
The seed coat is formed by the hardening of the
A. ovule. B. integument. C. endosperm. D. embryo. E. prothallus.
In DNA, the 300 Å fiber is formed into structural loops. Responsibility for this function appears to lie with
A) histone H4. B) nucleosomase. C) histone H1. D) certain nonhistone proteins. E) remodeling complexes.
It is generally thought that four critical innovations arose during the evolution of our ape-like ancestors into humans. All of the following are innovations except
a. use of brain power for abstract thought. b. development of the opposable thumb. c. expansion of the human brain. d. toolmaking. e. bipedalism.