Which of the following statements about the organization of complex multicellular organisms is false?
A. Exterior cells are highly differentiated
whereas interior cells are not differentiated.
B. Only some cells are in direct contact with
the environment.
C. Interior cells cannot grow as fast as
exterior cells without mechanisms to transfer
nutrients between cells.
D. Exterior cells receive environmental
signals directly, whereas interior cells receive
environmental signals indirectly.
E. Signals transferred from exterior cells to
interior cells can activate or repress gene
expression in the interior cells.
A
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In the final reaction of the blood clotting cascade, the soluble plasma protein _____ is converted to the insoluble protein ________, which then forms a network of fibers.
A. fibrin; prothrombin B. fibrinogen; fibrin C. thrombin; fibrin D. fibrinogen; thrombin E. prothrombin; thrombin
Which stem variation is a short underground stem that is encased by overlapping scales?
a. Stolons b. Rhizomes c. Cladophore d. Bulb e. Tuber
In the internal leaf structure shown above, the item labeled "3" is
a. a vascular bundle. b. spongy mesophyll. c. epidermis. d. a stoma. e. palisade mesophyll.
Chromosome pair number 23 is classified as
a. centrosomes. b. somatosomes. c. sex chromosomes. d. autosomes. e. corposomes.