If the number of disease-causing bacteria can grow exponentially in the body, why don't all people succumb to them at an early age?
What will be an ideal response?
The body contains cells expressly designed to thwart invasions. When a
bacterium enters and begins to grow, it encounters some of these T-cells (the T stands for
thymus). The T-cells become primed to deal with the invaders and proliferate, also
exponentially. The body mounts a swift and growing defense until the invasion is beat back.
So the response to exponential growth of invaders is exponential growth of invasion
fighters.
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The electric potential inside a charged solid spherical conductor in equilibrium
a. is always zero. b. is constant and equal to its value at the surface. c. decreases from its value at the surface to a value of zero at the center. d. increases from its value at the surface to a value at the center that is a multiple of the potential at the surface. e. is equal to the charge passing through the surface per unit time divided by the resistance.
Which of the following quantities are units of momentum? (There could be more than one correct choice.)
A) N ? m B) kg ? s/m C) kg ? m/s D) N ? s E) kg ? m2/s2
Upper-main-sequence stars, more massive than the Sun, fuse hydrogen by a process called the _____
A) proton-proton chain B) carbon-nitrogen-oxygen cycle C) zero-age main sequence D) proton-neutron chain
If a galaxy is located at a distance of 18 Mpc and is found to have recessional velocity of 1170 km/s, what is Hubble's constant based only on this galaxy?
a. 65 km/s b. 75 km/s c. 55 km/s d. 85 km/s e. 95 km/s