Multicellular organisms likely arose around ____ million years ago
a. 900
b. 600
c. 300
d. 100
e. 10
ANSWER: a
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Which molecules integrate changes outside and inside the cells through communicating changes in the extracellular
matrix to the cytoskeleton?
a. gap junctions and proteoglycans b. collagen and integrin c. fibronectin and collagen d. fibronectin and integrin e. gap junctions and fibronectin
Characteristics of mitochondria include that they ____
a. have two membranes, with the outer membrane being highly folded b. are least abundant in metabolically active cells c. does not require oxygen for its functioning d. function in photosynthesis e. have their own DNA and ribosomes and divide independently of the cell
Which type of fossil is considered a trace fossil?
a. footprint b. shell c. seeds d. teeth e. spores
In humans, the allantois:a
stores embryonic nitrogenous wastes. b. eliminates nitrogenous wastes from the embryo. c. contributes to the formation of the blood vessels in the umbilical cord. d. secretes amniotic fluid. e. serves as a temporary center for formation of blood cells.