The outside of a neuron is positively charged at resting potential. Why don't negative ions exit from the cell to normalize charge across the membrane?
A. The positive charge outside the cell repels negative ions.
B. There are no negative ions inside the cell.
C. All of the chloride ions are already outside the cell.
D. The negative charge inside the cell is carried by large proteins that cannot diffuse through the membrane.
D. The negative charge inside the cell is carried by large proteins that cannot diffuse through the membrane.
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B. thuringiens bacteria is a remarkable resource for researchers and farmers alike when it comes to pest control. Why? Select all correct choices
A. It contains a Ti plasmid. B. It produces insect toxins. C. It is responsible for crown gall disease and can be used to kill parasitic plants. D. Its genes can be used to genetically engineer plants. E. It produces cardenolides.
Late mRNA products in T4 phage include
A. phage structural proteins. B. proteins involved in cell lysis and phage release. C. proteins that help with phage assembly without becoming part of the virion. D. All of the above are correct.
The step that follows helper T cell activation is:
What will be an ideal response?
Red blood cells have been very useful in the study of membranes and the protein components that provide structural support. Which of the following proteins is the principal fibrous protein in the cortex of the red blood cell?
(a) tubulin (b) attachment proteins (c) actin (d) spectrin