An example of an organism's genotypic characteristic is its:
a. macroscopic morphologic structure.
b. microscopic morphologic structure.
c. nucleic acid composition.
d. antigenic properties.
C
The organism's nucleic acid composition—deoxyribonucleic acid (DNA) and ribonucleic acid (RNA)—is a genotypic characteristic. All of the other choices are phenotypic characteristics.
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Mendeleev found that when he arranged the known elements according to their atomic mass, the entries in the table exhibited a pattern of chemical properties that repeated itself in groups of eight elements. This led to the generalization now known as:
A. an atomic model. B. valance electrons. C. the periodic table. D. the octet rule.
Mutations in the nucleic acid sequence of a gene can sometimes direct the substitution of one amino acid for another in the encoded protein. Which amino acid substitution would be most likely to severely disrupt the normal structure of a protein?
A.) asparagine to threonine B.) leucine to isoleucine C.) tryptophan to phenylalanine D.) alanine to glycine E.) methionine to arginine
Suppose you send out 350 surveys to random sample of all past customers (your target population) asking them to report their level of satisfaction with your product. Of the 350, you used the 112 that responded to the survey to construct a confidence interval for the population "satisfaction score." What might be a potential problem with this confidence interval?
A. There is likely to be skewness in the sample. B. Predictable-world bias C. Satisfaction scores are inherently variable. D. The sample you're using is not a random sample from the target population.
In the fluid-mosaic model of the plasma membrane, the phospholipid molecules are oriented so that the ________ heads are facing the outside environment and the ________ tails are facing the interior of the membrane.
A. ectothermic, endothermic B. hydrophobic, hydrophilic C. heterotrophic, autotrophic D. autotrophic, heterotrophic E. hydrophilic, hydrophobic