Which of the following traits are found in both fungi and animals?
A. saprotrophs & contain cell walls of chitin
B. heterotrophic & absorb food
C. heterotrophic & consume preformed organic matter
D. saprotrophs & contain cell walls of cellulose
E. multicellular & saprotrophs
Answer: C
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Recognizing pathogens that contain multiple unique proteins which enable the human immune system to recognize just one and mount an effective response has opened the door on development of some vaccines only being
A) attenuated carrier viruses. B) monovalent. C) subunit vaccines. D) purified protein administered.
Which of the following is a key feature of primates?
A. They have a brain that is large in relation to their body. B. They have mammary glands. C. They are endotherms. D. They give birth to live young.
The rate of diffusion through a semipermeable membrane will be lowest when the
a. differences in concentration on either side are the greatest. b. temperature is raised to near boiling. c. differences in concentration on either side are the least. d. actions of active transport override diffusion. e. inside is hypertonic to the outside.
Active transport makes it possible for cells to
A) take up nutrients from the environment against concentrations gradients. B) transport out secretory products and waste material against concentration gradients. C) maintain nonequilibrium intracellular concentrations of ions such as Na+, K+, Ca2+, and H+. D) establish an electrical potential across the membrane. E) All of the above are correct.