Which statements about the complement system of vertebrates are correct? (Check all that apply.)
_____ The complement system is a part of the immune system of vertebrates.
_____ The complement system consists of approximately 30 different proteins that circulate in the plasma.
_____ If these proteins encounter the cell wall of a bacteria or fungi they form aggregations and eventually produce a pore that leads to the destruction of the invading cells.
_____ Although complement proteins attack invaders, they are not involved with histamine release.
_____ The complement system produces antibodies to bind invading cells.
__X__ The complement system is a part of the immune system of vertebrates.
__X__ The complement system consists of approximately 30 different proteins that circulate in the plasma.
__X__ If these proteins encounter the cell wall of a bacteria or fungi they form aggregations and eventually produce a pore that leads to the destruction of the invading cells.
_____ Although complement proteins attack invaders, they are not involved with histamine release.
_____ The complement system produces antibodies to bind invading cells.
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The membrane potential refers to the ____ across a cell membrane
a. difference in water concentration b. charge difference c. rate of movement d. distance e. difference in salt concentration
Explain why lacOc mutations are cis-acting, whereas lacI mutations can be trans-acting
What will be an ideal response?
Humans have the diploid number of chromosomes, 2n = 46. This also indicates humans
A. have two genomes. B. are more intelligent than worms. C. have at least two genotypes that can result from fertilization. D. have 23 chromosomes that are necessary for life.
Mutations are important to the evolution of a species because they
a. accelerate the transcription rate of DNA b. are a source of genetic variability c. happen over the long period of time that evolution requires d. cut out and replace damaged or useless genes