The compound that is an organic base containing chlorine and two phenolic rings and is used increasingly for hand scrubbing, neonatal washes, wound degerming, and prepping surgical skin sites is
A. quarternary ammonium compounds.
B. carbolic acid.
C. formalin.
D. chlorhexidine.
E. triclosan.
Answer: D
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Consider the example of sickle-cell anemia and the allele for the sickle-cell trait, and answer the following
t or f: Eventually, natural selection will typically result in the sickle-cell allele being fixed in the population. t or f: Selection at this locus is an example of disruptive selection. t or f: This is an example of stabilizing selection and will decrease the variation at this locus in the population. t or f: This is an example of stabilizing selection and will maintain variation at this locus. t or f: Hypothetically, if homozygous recessives had the highest fitness (i.e. selection was directional) of the three genotypes discussed in the text, then natural selection would lead to fixation of the sickle-cell allele. What will be an ideal response?
Which is true of the following reaction: Pi + ADP -> ATF?
A. It has a change in free energy that is less than 0. B. It has a change in free energy that is greater than 0. C. It can be used to drive endergonic reactions. D. It yields energy. E. It has a change in free energy that is greater than 0, and hence can be used to drive endergonic reactions.
What type of protein can transduce a signal in two directions?
a. integrins b. G proteins c. Ras proteins d. scaffold proteins e. phosphorylated proteins
The growth that pushes a root down through the soil takes place through
A) cell elongation at the tip of the root cap. B) cell division in the apical meristem. C) cell elongation behind the root tip. D) differentiation of xylem cells in the apical meristem.