Which of the following statements about a resting transmembrane potential is true?
a. If the sodium-potassium pump were blocked, the transmembrane potential would become
greater.
b. If the resting neuron were suddenly made permeable to positive ions, a transmembrane
potential would not form.
c. If the resting neuron had no voltage-activated K+ channels, K+ concentrations in cytoplasm
would increase.
d. If the voltage-activated Na+ channels are blocked, Na+ will not enter the cytoplasm of the
neuron.
e. If the cytosol developed a negative charge, the resting potential would disappear..
B
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Answer the following statements true (T) or false (F)
1. Cells can sense changes in the environment through alterations in the extracellular matrix. 2. Wrinkling observed with aging is do to low production of the extracellular matrix molecule, fibronectin. 3. Blood vessels that can expand and contract are largely composed of collagen as a structural extracellular matrix protein. 4. Glycosaminoglycans and proteoglycans resist compression and are found in large abundance in joints of the body. 5. Cellulose from the cell wall is a primary energy store for plants.
You are studying the bacteria in the water of a nearby pond. From a 100 mL sample, you use a 0.5 mL subsample to inoculate a plastic dish filled with a semisolid nutrient medium that fosters growth of coliform bacteria. After an appropriate incubation period, you count 100 bacterial colonies growing on the surface of the medium. What conclusion can you make about the coliform bacteria in the pond water?
A. There is approximately one coliform bacterial cell per milliliter. B. There are approximately 200 coliform bacterial cells per milliliter. C. There is approximately one coliform bacterial species per milliliter. D. There are approximately 200 coliform bacterial species per milliliter.
What does the internal Urethral Sphincter do?
What will be an ideal response?
The key point in Darwin's proposal is that the ________ imposes the conditions that determine the direction of selection.
A. gene B. parent C. environment D. individual