Sarin gas is an inhibitor of an enzyme that functions in the neuromuscular junction to break down acetylcholine. What is the most likely description of how a person would die after inhaling this poisonous gas?
A. Paralysis of skeletal muscles
B. Epileptic convulsions caused by disorganized electrical activity in the brain
C. Suffocation via paralysis, or a block in stimulation, of the respiratory muscles
D. Suffocation via tetanus, or constant stimulation, of the respiratory muscles
E. By a heart attack
Answer: D
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What nucleotide change is a shared derived character for species A, B, and C, but not for species G?
A,T,G, and C refer to nucleotide bases, and the numbers refer to the position of the base in the nucleotide sequences.
For example, A6 refers to an adenine at the sixth position.
A. Changing the second G to an A is common to species A, B, and C, but not to species G.
B. Changing the fifth T to a G is common to species A, B, and C, but not to species G.
C. Changing the second G to a T is common to species A, B, and C, but not to species G.
D. Changing the second G to an A and the fifth T to a G is common to species A, B, and C, but not to species G.
E. None of these show a change in derived characteristics for A, B, and C that are not found in G.
In plants, sporogenous cells divide by mitosis to form spores
___________________ Indicate whether the statement is true or false.
The ecological footprint of an average Egyptian is greater than that of an average American.
Answer the following statement true (T) or false (F)
The difference between pinocytosis and receptor-mediated endocytosis is that _____
A) pinocytosis brings only water molecules into the cell, but receptor-mediated endocytosis brings in other molecules as well. B) pinocytosis increases the surface area of the plasma membrane, whereas receptor-mediated endocytosis decreases the plasma membrane surface area. C) pinocytosis is nonselective in the molecules it brings into the cell, whereas receptor-mediated endocytosis offers more selectivity. D) pinocytosis can concentrate substances from the extracellular fluid, but receptor-mediated endocytosis cannot.