Practice Questions

TLS Online TPP Program

#Question id: 9609

Dozens of potato varieties exist, differing from each other in potato-tuber size, skin color, flesh color, and shape. One might construct a classification of potatoes based on these morphological traits. Which of these criticisms of such a classification scheme is most likely to come from an adherent of the phylocode method of classification?

#Section C (Domain-Specific Knowledge)

Flesh color, rather than skin color, is a valid trait to use for classification because it is less susceptible to change with the age of the tuber.
Flower color is a better classification criterion, because below-ground tubers can be influenced by minerals in the soil as much as by their genes.
The only biologically valid classification of potato varieties is one that accurately reflects their genetic and evolutionary relatedness.
The most accurate phylogenetic code is that of Linnaeus. Classify potatoes based on Linnaean principles; not according to their color.

More Questions

TLS Online TPP Program

#Question id: 73

#Section C (Domain-Specific Knowledge)

Match the Variation of Reaction Spontaneity (Sign of ΔG) given in Column I with the Signs of ΔH and ΔS given in column II.

COLUMN I	COLUMN II
	ΔH	ΔS	ΔG = ΔH – TΔS
1.	−	+	a. The reaction is both enthalpically and entropically opposed. It is nonspontaneous (endergonic) at all temperatures.
2.	−	−	b. The reaction is enthalpically opposed (endothermic) but entropically favored. It is spontaneous only at temperatures above T = ΔH/ΔS.
3.	+	+	c. The reaction is enthalpically favored but entropically opposed. It is spontaneous only at temperatures below T = ΔH/ΔS.
4.	+	−	d. The reaction is both enthalpically favored (exothermic) and entropically favored. It is spontaneous (exergonic) at all temperatures.

TLS Online TPP Program

#Question id: 74

#Section C (Domain-Specific Knowledge)

The enthalpy and entropy of the initial and final states of a reacting system are shown in the table. Calculate the change in free energy for the reaction when the temperature is 4°C.

TLS Online TPP Program

#Question id: 75

#Section C (Domain-Specific Knowledge)

The experimental approach taken in current biological investigations presumes that ________.

TLS Online TPP Program

#Question id: 76

#Section C (Domain-Specific Knowledge)

Which of the following illustrations is not a structural isomer of an organic compound with the molecular formula C6H14? For clarity, only the carbon skeletons are shown; hydrogen atoms that would be attached to the carbons have been omitted.

TLS Online TPP Program

#Question id: 77

#Section C (Domain-Specific Knowledge)

Which of the pairs of molecular structures shown depict enantiomers (enantiomeric forms) of the same molecule?

TLS Online TPP Program

#Question id: 469

#Section C (Domain-Specific Knowledge)

The anaerobic conversion of 1 mol of glucose to 2 mol of lactate by fermentation is accompanied by a net gain of: