A scientist is studying endosymbiosis in cells. This means she is investigating
A. how mitochondria and chloroplasts evolved into eukaryotic cells.
B. how mitochondria and chloroplasts evolved into prokaryotic cells.
C. how mitochondria and chloroplasts were derived from eukaryotic cells.
D. how mitochondria and chloroplasts were derived from prokaryotic cells.
Answer: D
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Why are most infants with phenylketonuria usually healthy at birth?
a. The defect causing the condition has usually been repaired by that time. b. The mother breaks down phenylalanine for both herself and her fetus. c. The infant can produce sufficient quantities of the enzymes needed by birth. d. Phenylalanine can be completely excreted in infants. e. Phenylalanine is completely metabolized in infants
The major cell surface receptor(s) responsible for the attachment of cells to the extracellular matrix is (are)
a. hemidesmosomes. b. desmosomes. c. integrins. d. laminin.
Alginates are used in many everyday products, including toothpaste and soap. When added to water, they form a thick gel that binds or emulsifies liquids. Alginates come from a group of multicellular stramenopiles that have one pigment that masks all
others and therefore gives these organisms a distinctive, dark color. Alginates are derived from A) green algae. B) brown algae. C) water molds. D) dinoflagellates.
Put the terms in the correct order for the path food takes in a ruminant.
A. reticulum ? abomasum ? rumen ? omasum B. omasum ? reticulum ? abomasum ? rumen C. abomasum ? rumen ? omasum ? reticulum D. rumen ? reticulum ? omasum ? abomasum