In all of the following characteristics, prokaryotes differ from eukaryotes except in
A. cell size.
B. multicellularity.
C. chromosomes.
D. nucleic acids as the hereditary material.
E. organelles.
D. nucleic acids as the hereditary material.
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A physician discovered a cancerous tumor in the cartilage of a patient. What type of tumor is this?
A. myoloma B. retroviral C. sarcoma D. leukemia E. cyst
How could you distinguish between the two pathogens Streptococcus aureus, which causes
strep throat, and Plasmodium falciparum, which causes malaria?
a. S. aureus does not have any genetic material. b. S. aureus is larger than P. falciparum. c. P. falciparum has membrane-bound organelles. d. S. aureus does not have a cell membrane
Which statement about G protein is false?
a. Its subunits can separate. b. One subunit is a GTPase. c. One subunit binds GTP. d. One subunit binds GDP. e. One subunit binds ATP.
Chemical signals that mediate interactions between two or more members of a given species are called ________.
A. competitive exclusions B. pheromones C. hormones D. alarm signals