Simple multicellular organisms show which of the following characteristics?
A. All of these options are characteristics of
simple multicellular organisms.
B. adhesion of cells
C. little differentiation of specialized cell types
D. little communication between cells
E. little transfer of resources between cells
A
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Squids are dominant nektonic predators in the open ocean
Indicate whether the statement is true or false
Myoglobin supplies ____ to fuel muscle activity
a. oxygen for aerobic respiration b. phosphate for ATP formation c. direct energy for white muscle fiber contraction d. glucose for lactate fermentation e. glucose for aerobic respiration
Some enzymatic receptors and most G protein-coupled receptors transmit the signal into the cytoplasm by utilizing other substances within the cytoplasm that are referred to as:
A. second messengers. B. first messengers. C. intracellular receptors. D. genes.
The major function of a receptor is to _____.
A. control the autonomic functions of the body B. stabilize the internal environment to achieve homeostasis C. produce responses to the various stimuli the body receives D. give organisms or cells awareness of and sensitivity to their environment E. control the visceral functions of the body