Muscle that is not striated and is involuntary is ____
a. cardiac only
b. skeletal only
c. smooth only
d. both cardiac and skeletal
e. both cardiac and smooth
c
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An action potential will be generated when the sum of all graded potentials reaches ________.
Fill in the blank(s) with the appropriate word(s).
Which organelle often takes up much of the volume of a plant cell?
A) lysosome B) vacuole C) Golgi apparatus D) peroxisome
In the laboratory, what is added to media to stabilize the pH within acceptable limits?
A) Buffers B) Proteins C) Enzymes D) Water
You are a substitute teacher in a high school biology lab class on the day the students are dissecting fetal pigs. One student finds that his pig's lungs, liver, pancreas, and digestive organs are either missing or small and malformed. The student
scratches his head with his clean hand and says, "What went on here?" Although there may be more than one reason, what might you propose as an explanation based on embryonic development? What will be an ideal response?