The smallest unit of life that can exist as a separate entity is a(n) ___________.
A. cell
B. molecule
C. organ
D. population
E. ecosystem
Answer: A
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Birds are the only modern amniotes with
a. wings. b. feathers. c. a four-chambered heart. d. ectothermic metabolism. e. more than one of these.
Isotopes are unstable and dissipate radioactive energy because they _____________
A. contain additional electrons in the electron orbital B. contain additional protons in the nucleus C. contain additional neutrons in the nucleus D. do not contain enough electrons in the electron orbital E. do not contain enough protons in the nucleus
According to the fluid mosaic model of cell membranes, which of the following is a TRUE statement about membrane phospholipids?
A) They frequently flip-flop from one side of the membrane to the other. B) They form a viscous fluid through which proteins shift and flow. C) They have hydrophilic tails in the interior of the membrane. D) They occur in an uninterrupted bilayer, with membrane proteins strictly anchored to the surface of the membrane. E) They are free to depart from the membrane and are dissolved in the surrounding solution.
The phase of the bacterial growth curve during which microbial growth slows and the rate of multiplication equals the rate of cell death is the
A. log phase. B. telophase. C. lag phase. D. stationary phase. E. death phase.