Which of the following is not a feature of a bacterial artificial chromosome (BAC) vector?
A. CEN sequences
B. origin of replication (ori)
C. par genes
D. selectable antibiotic resistance gene
E. cloning site within the ?-galactosidase gene
A
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Which element is considered an essential micronutrient for plants?
a. zinc b. potassium c. hydrogen d. arsenic e. platinum
Blood is pumped from the heart into the arterial system, which branches from arteries into fine _________.
A. arterioles B. veins C. capillaries D. venules
Synthetic organic compounds such are chlorofluorocarbons (CFCs) are damaging to the world's fresh water supply.
a. true b. false
A ________ ring is the characteristic feature present in BOTH cephalosporins and penicillins produced by fungi. Semisynthetic versions of these drugs typically ________ this ring structure with other functional groups
a. ?-lactam / add to b. ?-lactam / replace c. lactone / add to d. lactone / replace