A given enzyme works on
A. any number of different substrates.
B. one of two possible substrates.
C. no substrate.
D. one type of substrate.
D. one type of substrate.
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________ bind two or more ions or molecules and transport them in opposite directions across a membrane.
A. uniporters B. symporters C. antiporters D. dual transporters E. channel pumps
rokaryotes
A. include bacteria and archea. B. include bacteria and viruses. C. are any unicellular organism. D. include bacteria and viruses, but not archea. E. include bacteria, but not archea and viruses.
The phenotype of a person with alpha thalassemia depends on the
A) number of beta globin genes. B) presence or absence of a sickle cell mutation. C) number of alpha globin chains. D) rate of replication of the alpha globin genes.
Under the influence of hormones, branch roots emerge from the ________ of a growing root
A) epidermis B) Casparian strip C) endodermis D) pericycle E) central cylinder