Why is the outside of a neuron positively charged?
A. because calcium ions gather around the outside of the cell membrane
B. because sodium ions gather around the outside of the cell membrane
C. because chloride ions gather around the outside of the cell membrane
D. because potassium ions gather around the inside of the cell membrane
E. because sodium ions gather around the inside of the cell membrane
Answer: B
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What phase does it occur when a new nuclear membrane and nucleoli reappear?
What will be an ideal response?
Phosphodiesterase catalyzes the conversion of:
a. IP3 to PIP2. b. GDP to GTP. c. cAMP to AMP. d. calcium to calcium-calmodulin. e. a protein to a phosphorylated protein.
Mutations in the selector genes sometimes form structures in the wrong segment, transforming the antenna of a fly into a leg, for example. What are such mutations called?
A) homologous mutations B) lethal mutations C) homeotic mutations D) silent mutations
Which test is used to identify antigens on red blood cells for blood typing?
A. ELISA B. Precipitation C. Western blot D. Agglutination E. Microarrays