The experimental approach taken in current biological investigations presumes that _____
A) simple organic compounds can be synthesized in the laboratory from inorganic precursors, but complex organic compounds like carbohydrates and proteins can be synthesized only by living organisms
B) a life force ultimately controls the activities of living organisms and this life force cannot be studied by physical or chemical methods
C) living organisms are composed of the same elements present in nonliving things, plus a few special trace elements found only in living organisms or their products
D) living organisms can be understood in terms of the same physical and chemical laws that can be used to explain all natural phenomena
D
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Figure 15.1 shows the three alleles for the beta-globin gene. Which of the following statements best describes the effect of having the S allele, which codes for sickle-cell anemia?
A. Having the allele is always harmful. B. Having the allele is always beneficial. C. The effect depends on whether the allele occurs in its homozygous or heterozygous form. D. The effect depends on the environment (i.e., whether malaria is present). E. The effect depends on whether the allele occurs in its homozygous or heterozygous form, and the environment (i.e., whether malaria is present).
Which of the following is true of hydrogen peroxide?
A. It is a sterilant for inanimate objects and is quickly inactivated on living tissue. B. It leaves a toxic residue. C. It is broken down by catalase into water and oxygen. D. It is even more effective when used in combination with peracetic acid. E. It is a sterilant for inanimate objects and is quickly inactivated on living tissue; it is broken down by catalase into water and oxygen; AND it is even more effective when used in combination with peracetic acid.
For roundworms living in the intestine of a
vertebrate, the cuticle most probably serves in what capacity? a. water retention b. nutrient absorption c. protection from digestive enzymes d. excretion of metabolic wastes e. sensory detection
The broad-sense heritability of a trait is estimated at 0.8. If the total phenotypic variance is estimated at 32.20, what is the genetic variance?
What will be an ideal response?