The ? chain of adult hemoglobin is composed of 146 amino acids of a known sequence. In comparing the normal ? chain with the ? chain in sickle-cell hemoglobin, what alteration is one likely to find?
A) trinucleotide repeats
B) extensive amino acid substitutions
C) glutamic acid replacing valine in the first position
D) frameshift substitutions
E) valine instead of glutamic acid in the sixth position
E
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In all organisms, active transport across a membrane requires
A) equal concentrations of ions on both sides of the membrane. B) a resting potential of 0 mV. C) exergonic movement indicated by the direction of the electrochemical potential. D) an asymmetric distribution of ions across a membrane. E) both choices B and D
Which equation best describes the relationship between ion gradient and equilibrium potential for that ion?
A) steady-state B) Goldman C) Nernst D) Hodgkin E) Katz
A eukaryotic cell is found to have a nuclear membrane that allows tRNA molecules, but not mRNA molecules, to leave the nucleus. Which of the following processes will NOT be able to take place in this cell?
a. DNA replication b. tRNAs binding to codons c. RNA being made from DNA d. tRNAs binding to amino acids
Archaea are cellular organisms that have unique cell membrane ________.
Fill in the blank(s) with the appropriate word(s).