Which vitamin is used for connective tissue formation?

a. B12
b. B1
c. A
d. E
e. K


B

Biology & Microbiology

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The ________ are drugs that deposit in developing teeth and cause a permanent brown discoloration.

A. tetracyclines B. penicillins C. streptomycins D. cephalosporins E. macrolides

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Monomeric G proteins, such as Ras and several elongation factors, are usually in the active state when a molecule of _______ is bound to them.

a. GDP b. GTP c. ADP d. ATP

Biology & Microbiology

A lac repressor turns off the expression of the lac genes by

a. Binding to the promoter b. DNA polymerase c. Binding to the operator d. Binding to the lac genes

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As ice melts

A) hydrogen bonds are broken. B) water molecules become less tightly packed. C) the water becomes less dense. D) heat is released.

Biology & Microbiology