Why can measles virus and poxvirus infect many human tissues and influenza virus can infect only one type of tissue? What will be an ideal response?
Measles virus and poxvirus have attachment proteins that combine with many different tissue
receptors whereas influenza virus attachment proteins are specific for respiratory tissue
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Which type of receptor is involved in rapid responses of muscle cells and neurons? (Select all correct choices.)
A. G protein-coupled receptor B. receptor kinase C. ligand-gated ion channel D. nuclear receptor
The Archaea generally lack which of the following that are normally found in gram-negative bacteria?
A. A complex peptidoglycan network B. Outer membrane C. Lipopolysaccharide D. All of the choices are correct.
The Red Queen hypothesis may explain
a. why asexual reproduction is easier and faster than sexual reproduction. b. why aphids seasonally alternate parthenogenesis with sexual reproduction. c. the existence of all-female species of animals. d. the connection between species interactions and sexual reproduction. e. why meiosis and fertilization alternate during sexual reproduction.
Human insulin is produced in transgenic hamster cells. Indicate whether the statement is true or false