Beta-lactamase enzymes destroy the beta-lactam ring of penicillin antibiotics rendering them inactive.

Beta-lactamase enzymes are most commonly produced by:

What is the mode of action of the tetracycline antibiotics?

A turtle walks southward along a deserted highway with an average velocity of magnitude 8.6 x 10-2 m/s in 3.5 minutes. A truck driver stops and picks up the turtle. The driver takes the turtle to a town to the north with an average speed of 12 m/s in 91.7 s. What is the magnitude of the average velocity of the turtle for the entire journey?

The average density of the material in intergalactic space is approximately 2.5 × 10–27 kg/m3.  What is the volume of a lead sample, r = 11 300 kg/m3, that has the same mass as 8 × 1024 m3 of intergalactic space?

Two disks are rotating about the same axis. Disk A has a moment of inertia of 3.4 kgm2 and an angular velocity of 7.2 rad/s. Disk B is rotating with an angular velocity of −9.8 rad/s. The two disks are then linked together without the aid of any external torques, so that they rotate as a single unit with an angular velocity of −2.4 rad/s. The axis of rotation for this unit is the same as that for the separate disks. What is the moment of inertia of disk B?

Alexa’s hair grows with an average speed of 3.5 × 10–9 m/s. How long (in years) does it take her hair to grow 0.3 m?

The drawing shows two 44.1 N balls located on the y axis at 1 m and 9 m, respectively, and a third ball with a weight of 22.5 N which is located at 6 m. What is the location of the center of gravity of this system?

A tennis ball has a mass of 56 g and is falling near the surface of the earth. Calculate the magnitude of the gravitational force exerted on the tennis ball by the earth.

A race car has a speed of 80 m/s when the driver releases a drag parachute. If the parachute causes a deceleration of –4 m/s2, how far will the car travel before it stops?