In an HIV-infected cell producing HIV virus particles, the viral glycoprotein is expressed on the plasma membrane. How do the viral glycoproteins get to the plasma membrane? They are synthesized _____
A) on ribosomes on the plasma membrane
B) by ribosomes in the rough ER and arrive at the plasma membrane in the membrane of secretory vesicles
C) on free cytoplasmic ribosomes and then inserted into the plasma membrane
D) by ribosomes in the rough ER, secreted from the cell, and inserted into the plasma membrane from the outside
B
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Which of the following would be likely to require facilitated diffusion to move across the plasma membrane?
a. water (H2O) b. sodium ions (Na+), hydrogen ions (H+), sugars, and amino acids c. oxygen (O2) d. carbon dioxide (CO2)
The leaves of ginkgo trees are unique because they have
A. forked veins. B. veins in a netlike pattern. C. multiply branching veins. D. veins only around the edges. E. unbranched veins.
One effect of washing regularly with antibacterial agents is the removal of normal microbiota. This can result in
A) body odor. B) fewer diseases. C) increased susceptibility to disease. D) normal microbiota returning immediately. E) no bacterial growth because washing removes their food source.
The anticodon of an incoming ____________ molecule, carrying its amino acid, pairs with the mRNA __________ at the ribosome.
A. tRNA ... codon B. amino acid ... structure C. tRNA ... phosphate D. ribosome ... protein