A lysosomal storage disease is caused by
A) failure of the cell to produce lysosomes.
B) the inability to synthesize glycolipids.
C) mutations in genes for lysosomic membrane proteins.
D) an excess in the production of lysosomic digestive enzymes.
E) mutations in genes that code for lysosomic digestive enzymes.
E
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Twins are concordant for a trait when ____
a. both twins share the trait with at least one parent b. only identical twins have the trait c. only fraternal twins have the trait d. both twins have the trait e. all of the twins' siblings have the trait
One difference between tight junctions and dermatomes is that tight junctions:a
are regions where the plasma membrane from two neighboring cells are in actual contact. b. occur only in plants. c. involve connective microfilaments that traverse the space between adjacent cells. d. are anchored by microfilaments on the insides of the cell membranes of adjacent cells. e. contain a 24 nm space between two adjacent membranes.
____ is a responsive process.
A. Waste elimination B. Adaptation C. Reproduction D. Coordination
Prokaryotic cells are represented by fossils that are dated back as far as _____ billion years ago.
A. 1.5 B. 2.8 C. 3.8 D. 4.8