Members of the phylum Thaumarchaeota produce a membrane lipid that differs from other diglycerol tetraethers found in Proteoarchaeota in that ________.
A. it contains a cyclohexane ring that promotes membrane fluidity at lower temperatures
B. it contains several cyclohexane rings that stabilize the membrane at high temperatures
C. it contains several cyclopentane rings that stiffen the membrane at lower temperatures
D. it contains a single cyclohexane ring within the phosphilipid bilayer that promotes membrane fluidity
Answer: A
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A reciprocal exchange in which a pair of DNA with the same nucleotide sequence break and rejoin in a crossover is called ________ recombination.
A. site-specific B. replicative C. homologous D. None of the choices are correct.
A trait that is expressed as a continuum rather than as a few discrete phenotypes is
A. polygenic. B. sex-linked. C. codominant. D. Mendelian. E. either polygenic or codominant.
Which statement is true?
1.Both the parasympathetic and sympathetic nervous systems send nerves to all organs. 2.The sympathetic nervous system that supplies an organ will also provide parasympathetic nerves to it. 3.The sympathetic branch can have either excitatory or inhibitory effects depending on effects from the environment. 4.The sympathetic branch of the autonomic system usually speeds up the activities of the body. 5.The parasympathetic system usually speeds up the activities of the body.
What is the primary function of stems?
A) Facilitation of gas exchange B) Water absorption and movement C) Maximization of photosynthesis by leaves D) Reproduction