Which of the following characteristics are shared by animals and fungi? Check all that apply.
A. secrete digestive enzymes
B. absorptive nutrition
C. derived from protists
D. autotrophic
E. cell walls
Answer: C
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When a ciliate reproduces asexually by mitosis:
A. The macronucleus divides into two with each new cell receiving an identical macronucleus. B. The macronucleus divides into four micronuclei with each new cell receiving two micronuclei each. C. The macronucleus doesn't divide but it goes to one new cell and the micronuclei go to the other. D. The macronuclei fuse with the micronuclei and then divide into two with each new cell receiving an identical fused nucleus. E. none of the other choices provided
Darwin calculated that if reproduction was not limited, a single pair of elephants could leave ____
descendants after 750 years.
a. 750 b. 15,000 c. 150,000 d. 19 million e. 190 million
The simultaneous movement of sucrose into a cell against its concentration gradient and protons into a cell with their concentration gradient is best described as an example of
a. symport. b. passive diffusion. c. antiport. d. facilitated diffusion. e. active transport.
What is the major difference between the cell walls of gram-positive and gram-negative bacteria?
A. the cell wall of gram-positive bacteria contains mycolic acids B. the peptidoglycan layer in gram-positive bacteria is substantially thicker C. gram-positive bacteria may have a polysaccharide capsule as a covering D. gram-positive bacteria contain a cytoplasmic membrane E. all of the above are correct