The order of the structural genes in the lac operon is
A) 5'-lacY-lacZ-lacA-3'.
B) 3'-lacZ-lacY-lacA-5'.
C) 5'-lacZ-lacY-lacA-3'.
D) 3'-lacY-lacA-lacZ-5'.
E) 5'-lacA-lacY-lacZ-3'.
C
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Which type of molecular movement is a passive process
A) sodium-potassium pump B) endocytosis C) exocytosis D) diffusion E) active transport
Plants in the desert-adapted families Cactacea (cactus) and Euphorbia (euphorbs) share many of the same physical characteristics, such as succulent stems that store water and CAM photosynthesis, but they do not share a recent common ancestor. This evidence suggests that these families are an example of
A. convergent evolution. B. homologous structures. C. vestigial structures. D. divergent evolution.
The umbilical cord functions to
a. carry waste products in the blood from the fetus to the mother. b. carry waste products in the blood from the mother to the fetus. c. carry oxygen in the blood from the mother to the fetus. d. do both a and c.
Why can measles virus and poxvirus infect many human tissues and influenza virus can infect only
one type of tissue? What will be an ideal response?