The large intestine concentrates undigested material by
A. squeezing excess salts and water from the undigested material via contraction of muscles in the intestine wall.
B. absorption of salts and water across the epithelial surface of the lumen.
C. ingestion of excess salts and water by intestinal bacteria.
D. storing excess salts and water in the cecum.
E. transporting excess salts and water back to the small intestine for absorption.
B. absorption of salts and water across the epithelial surface of the lumen.
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Indicate whether the statement is true or false.
During normal DNA replication, part of the sequence at the ends of linear chromosomes is not copied into the new
DNA strands because ____.
a. DNA ligase cannot join pieces at the end of a chromosome b. RNA primers at the beginning of a new strand cannot be replaced with DNA c. those ends are Okazaki fragments that are lost d. cells do not need the DNA at the ends of chromosomes e. the ends of chromosomes are made of protein, not DNA
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Light consists of units of energy called
A. electrons. B. calories. C. neutrons. D. photons. E. pigments.