How many of these species probably have a cell wall that consists partly of an outer membrane of lipopolysaccharide?
A) only one species
B) two species
C) three species
D) four species
C
You might also like to view...
Using phase contrast microscopy on a wet mount of live cells, you observe motile bacilli moving rapidly and randomly through the field of view, changing directions after a brief tumble and taking off in a different direction
These cells are exhibiting ________ motility. A) twitching B) swimming C) gliding D) twitching or gliding
How is the central portion of a T cell receptor complex functionally analogous to the center of the B cell receptor complex?
A. It has two pieces (chains), just like a B-cell receptor. B. Both receptors bind epitopes (small amino acid sections of antigen molecules). C. Both bind structures directly on the surface of microbes. D. Both can be secreted from lymphocytes to bind to pathogens under certain situations.
HIV, the virus that causes AIDS in humans, does not infect other animals, but only certain cells in the human body. Why?
What will be an ideal response?
Which of the following describe the placenta? (Check all that apply.)A) The bloods of the mother and the embryo come in close contact without mixing.B) The placenta neutralizes toxins like alcohol and drugs before they reach the fetus.C) Oxygen diffuses from the mother to the embryo.D) Carbon dioxide diffuses from the embryo to the mother.E) The placenta provides nourishment and hormones to the embryo.F) The antibodies made in the embryo protect the mother from infections.
What will be an ideal response?