On a lab bench, there are four balloons filled with identical volumes of different salt solutions: 0% (balloon
A), 5% (balloon B), 10% (balloon C), and 15% (balloon D). There are also four beakers each filled with identical volumes of a 10% salt solution. The balloons are semi-permeable; that is, only water can enter and exit the balloon. All four balloons are placed in separate beakers at the same time and are allowed to come to equilibrium. Which is the correct order of balloon volumes at equilibrium, from largest to smallest?
A) A < B < C < D
B) D < C < B < A
C) D < B < A < C
D) All balloons will be of equal volume at equilibrium.
A
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The "adaptor" molecule that was hypothesized by Francis Crick to link amino acids to mRNA is actually which type of biomolecule?
A. protein B. DNA C. tRNA D. rRNA
A certain bacterium infects a plant's upper leaves. A few days later, bacteria of the same species attempt to infect the same plant's roots but are unsuccessful. What process is responsible for the plant's ability to prevent this infection?
A) antivirulence response B) pathogenesis resistance C) systemic acquired resistance D) sequential immunity
Use your knowledge of amino acid characteristics to order the peptides below according to the net charge contributed by their side chains at physiological pH (~pH 7). Each peptide contains eight amino acids
Use the single-letter amino acid designations to generate your list, placing the most negatively charged peptide on the left and the most positively charged peptide on the right. In addition, for each peptide, list the total number of positive and negative charges. Remember that, at neutral pH, the amino terminus carries a positive charge and the carboxyl terminus carries a negative charge. A. YGAKKRA B. ARRKSTRK C. DERKQNST D. DDAEIYSA E. NQSTYEEG
Biological molecules with dipole moments:
A. are typically called nonpolar molecules. B. are typically called polar molecules. C. are found in environments in which they can interact with other nonpolar molecules. D. always display resonance. E. also have no single electrons in their outer valence shell.