941. Split injection is carried out by
A. splitting the sample into smaller portions to inject sequentially
B. splitting the sample into smaller portions to inject at the same time through parallel ports
C. splitting off some of the sample so that it does not enter the column
D. none of the above

942. What does the retention factor, k’, describe?
A. The distribution of an analyte between the stationary and the mobile phase
B. The migration rate of an analyte through a column
C. The velocity of the mobile phase
D. All of these

943. Theoretical plates are used to
A. estimate the efficiency of a column
B. determine the thickness of the stationary phase
C. measure the distribution of the analyte between mobile and stationary phases
D. None of the above

944. What does the selectivity factor describe?
A. The proportional difference in widths of two chromatographic peaks
B. The maximum number of different species which a column can separate simultaneously
C. The relative separation achieved between two species
D. None of the above

945. Helium is generally preferred as carrier gas over nitrogen and hydrogen because
A. it is inert
B. it has a lower viscosity
C. it doubles up as a party gas for balloons and funny voices
D. all of above

946. The column is heated to
A. prevent analyte condensation within the column
B. control elution of the different analytes
C. reduce band broadening to get sharper peaks
D. all of these

947. What are the benefits of decreasing the column internal diameter?
A. Increased sample capacity
B. Increased resolution
C. Reduced risk of column overloading
D. All of the above

948. Which of the following two organelles look most alike structurally?
A. Nucleus and vesicle
B. Golgi apparatus and smooth endoplasmic reticulum ER
C. Vacuole and cytoskeleton
D. Lysosome and chloroplast

949. In terms of basic cell structure, what do an elephant and an oak tree have in common?
A. They both are eukaryotes
B. They both have a cell nucleus
C. They both have mitochondria
D. All of the above

950. Where in a eukaryotic cell, DNA can be found?
A. Nucleus
B. Mitochondrion
C. Vacuole
D. Both (a) and (b)

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