Which of the following is not true of the regulation of translation initiation in eukaryotes?
A. Repressors bind to the 3' untranslated region of mRNA.
B. Repressors bind to initiation factors.
C. Repressors bind to translational start sites of mRNA.
D. Repressors bind to translational release factors.
D
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The oral and inactivated polio vaccines are made from plant cell cultures.
Answer the following statement true (T) or false (F)
The relative impermeability of membranes to watersoluble
molecules is a result of the a. nonpolar nature of water molecules. b. presence of large integral membrane proteins. c. presence of inorganic salt crystals scattered through some membranes. d. presence of cutin and lignin in the membranes. e. presence of phospholipids in the lipid bilayer.
Which of the following statements most accurately describes a selectively permeable membrane?
a. Solutes are never able to cross the membrane. b. Large molecules are always excluded from crossing the membrane. c. Substances can only pass through the membrane with the help of either active or passive transport proteins. d. Certain solutes move freely across the membrane by simple diffusion while others must be helped across by active or passive transport proteins; some substances are completely excluded from crossing the membrane.
Which of the following is not caused by Haemophilus influenzae?
What will be an ideal response?