Which of the following prokaryotic cells contain an outer membrane?
A. Gram-negative bacteria only
B. Gram-positive bacteria only
C. both Gram-positive and Gram-negative bacteria
D. archaea
E. all prokaryotes
Answer: A
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Signaling involves molecule A that binds another specific molecule B, often delivering the signal in the process. What do we call molecule A in this scenario?
a. target cell b. receptor c. ligand d. enzyme
In prokaryote DNA replication, nuclotide
assembly is
a. faster than eukaryotes. b. slower than eukaryotes. c. about the same speed as eukaryotes. d. sometimes slower; sometimes faster than eukaryotes. e. none of these
The lancelet is a(n) ________
A) annelid B) flatworm C) chordate D) tunicate
Which of the following is NOT an example of a walled-off site of infection that contains a fluid made of dead and dying tissue cells, leukocytes, and pathogens?
A. a boil B. an abscess C. a pimple D. a pustule E. a tumor