Lipid soluble molecules such as alcohol cannot diffuse through the plasma membrane.
a. true
b. false
b. false
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Degradation of organic matter is influenced by ________.
A. nutrient availability B. the nature of the microbial community present C. abiotic conditions D. All of the choices are correct.
When researchers analyzed the remains of Tsar Nicholas II of Russia and his family, they found that the suspected Tsar and his living great-grandniece Xenia differed at nucleotide position 16169 in the mitochondrial DNA. Retesting the remains showed that for this site in the mitochondrial genome, the purported Tsar had thymine (T) in some samples and cytosine (C) in others. The most likely cause of this finding is
A) the samples were too old. B) incomplete dominance. C) pleiotropy. D) heteroplasmy.
How many chromosomes do human somatic cells contain?
a. 23 b. 46 c. 92 d. 108
Vertebrate forelimbs evolved through which mechanism?
A. Morphological convergence B. Divergent evolution C. Analogous evolution D. Homologous evolution E. Structural adaptation