In what way are lysosomes and plant vacuoles similar to each other?
a. They are both involved in cell movement.
b. They are both involved in cell digestion.
c. They are both involved in cell sensitivity.
d. They are both involved in cell reproduction.
Answer: b. They are both involved in cell digestion.
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The semilunar valves of the mammalian heart _____
A) are the route by which blood flows from the atria to the ventricles B) are found only on the right side of the heart C) are the attachment sites where the pulmonary veins empty into the heart D) prevent backflow of blood in the aorta and pulmonary arteries E) are at the places where the anterior and posterior venae cavae empty into the heart
"Glycogenolysis" refers to the state where
A. glucose levels are increased in the blood through the breakdown of glycogen. B. glucose levels are increased in the blood through the synthesis of glycogen. C. glucose levels are decreased in the blood through the breakdown of glycogen. D. glucose levels are decreased in the blood through the synthesis of glycogen. E. glucose levels are increased in the blood as a result of lipolysis.
An excitatory postsynaptic potential
a. is only one of several types of graded potential. b. has a hyperpolarizing effect. c. will drive the membrane away from its potential. d. is summed with an inhibitory postsynaptic potential at the input zone of a neuron in a process known as synaptic integration. e. is none of these.
What is the most efficient way to regulate gene expression from the perspective of cellular resources?
What will be an ideal response?