Which of the following contribute(s) to the differences between the members of the Domain Archaea and the Domain Bacteria?
A. Archaea have isopranyl glycerol ethers rather than fatty acid esters in their membrane lipids.
B. Archaea lack muramic acid.
C. Archaea differ from bacteria in their tRNA composition, ribosome structure, and antibiotic sensitivity.
D. All of the choices are correct.
Answer: D
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Which of the following forces contribute to the stability of a DNA double helix?
A. hydrophobic interactions of bases in the same strand B. hydrogen bonding between bases in adjacent strands C. ionic interactions between the positively charged component of one base and the negatively charged component of the neighboring base D. hydrophobic interactions of bases in the same strand and hydrogen bonding between bases in adjacent strands E. hydrophobic interactions of bases in the same strand, hydrogen bonding between bases in adjacent strandsand ionic interactions between the positively charged component of one base and the negatively charged component of the neighboring base
The ectoderm is to the central nervous system as the mesoderm is to the
A. epidermis. B. respiratory tube. C. digestive tract. D. skeletal muscle. E. peripheral nervous system.
Glycogen is a polysaccharide used for energy
storage by
a. plants. b. animals. c. protists. d. bacteria. e. archaea
Frameshift mutations result from the:a
substitution of one base pair for another. b. substitution of more than one base pair. c. insertion or deletion of one or two base pairs. d. substitution of a stop codon for an amino acid-specifying codon. e. substitution of a start codon for an amino acid codon.