An epithelial tissue can best be defined as:
A. a collection of layered cells.
B. a collection of contractile cells.
C. a network of cells that use chemical
communication.
D. a few cells embedded into an extensive
extracellular matrix.
A
You might also like to view...
Sexual reproduction produces genetically unique individuals through (select all correct choices):
A. recombination during gamete formation. B. independent assortment during gamete formation. C. mutation during gamete formation. D. the combination of genetically unique gametes to form a new individual. E. DNA transfer during conjugation.
Two proteins that control synapse formation in response to environmental stimuli in early childhood and that when abnormal might lie behind autism are
A) collagen and elastin. B) insulin and glucagon. C) neurexin and neuroligin. D) fibrin and fibrinogen.
The difference between an epidemic and a pandemic is that ________
a. an epidemic breaks out in several countries at the same time, while a pandemic is a local outbreak b. a pandemic breaks out in several countries at the same time, while an epidemic is restricted to a single country c. an epidemic kills many infected people, while a pandemic sickens many but kills few d. epidemics occur sporadically, while pandemics are chronic diseases of a population
Various techniques have been developed to isolate strains of bacteria carrying a particular mutation. One of them is, bacteria containing wild-type cells and cells of a desired mutant are grown on a medium lacking the nutrient for which the desired mutants are auxotrophic but containing an antibiotic that only kills growing cells. In this environment,
A. wild-type cells die; mutant cells survive. B. wild-type cells survive; mutant cells die. C. both wild-type and mutant cells survive. D. only double mutants survive. E. both wild-type and mutant cells are killed.