You and your lab partner have isolated 20 new mutant yeast strains that are defective in synthesis of threonine, an amino acid. These Thr- mutants do not grow on minimal medium, but they do grow on minimal medium supplemented with threonine. Ten of your Thr- mutants (numbered 1 through 10) were isolated in a strain of mating type a (MAT a). The other 10 Thrmutants (numbered 11 through 20) were isolated in a strain of mating type α (MAT α). You and your lab partner cross each of the MAT a strains to each of the MAT α strains, and you include crosses to the appropriate wild-type strains. Your experimental observations are shown in the table below, where (-) indicates diploids that did not grow on minimal medium and (+) indicates diploids that did grow on minimal medium.

Which mutations are dominant?

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#Question id: 2253

#Unit 2. Cellular Organization

Match the following lipid linked proteins (column I) with their function (Column II).

Column I	Column II
A. prenylated proteins	i. These proteins are located in a number of subcellular compartments, including the cytosol, the endoplasmic reticulum, the inner face of the plasma membrane, and the nucleus.
B. fatty acylated proteins	ii. The core structure of these proteins consists of phosphatidylinositol glycosidically linked to a linear tetrasaccharide composed of three mannose residues and one glucosaminyl residue.
C. glycosylphosphatidylinositol-linked proteins	iii. The proteins that have covalently attached lipids that are built from isoprene units

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#Question id: 2254

#Unit 2. Cellular Organization

If the intracellular [Ca2+] is 10⁻⁷ mol/L and the extracellular [Ca2+] is 2 × 10⁻³ mol/L, at what potential difference across the cell membrane will Ca2+ be at electrochemical equilibrium?

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#Question id: 2255

#Unit 2. Cellular Organization

Following statements are regarding to the Na+/K+ ATPase maintains the intracellular Na+ and K+ concentrations in animal cells. Which of the following statement is incorrect?

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#Question id: 2256

#Unit 2. Cellular Organization

Match the following inhibitors (Column I) with their effect (Column II).

Column I	Column II
A. A23187	I. endoplasmic reticulum Ca2+ ATPase inhibitor
B. valinomycin	II. Na+/K+ ATPase inhibitor
C. thapsigargin	III. K+ ionophore
D. ouabain	IV. Ca2+ ionophore

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#Question id: 2257

#Unit 2. Cellular Organization

Match the following property (Column I) with the transport mechanism (Column II).

Column I	Column II
A. Facilitated Transport	i. Requires specific protein
B. Active Transport	ii. Solute transported against its gradient
C. Cotransport	iii. Coupled to ATP hydrolysis
	iv. Driven by movement of a cotransported ion down its gradient

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#Question id: 2258

#Unit 2. Cellular Organization

The arrangement of microtubules in eukaryotic flagella is referred to as