Which statement about antigen recognition in B and T cells is TRUE?
A) B cell antigen receptors can bind to intact freely circulating antigens that are bound to self proteins.
B) T cell antigen receptors can bind to intact antigens that are bound to self proteins.
C) B cell antigen receptors can bind to intact antigens that are on pathogen surfaces.
D) T cell antigen receptors can bind to intact freely circulating antigens.
C
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High expression levels of a eukaryotic gene in a bacterium such as Escherichia coli cannot be accomplished due to the presence of introns
Indicate whether the statement is true or false.
Which type of plant hormone is synthesized mainly in root tips and is apparently transported through
the plant in xylem sap?
a. gibberellins b. auxins c. oligosaccharins d. ethylene e. cytokinins
During male ejaculation ____
a. smooth muscle of the vas deferens contracts b. prostate contractions are inhibited c. sperm are forced into the epididymis d. the seminal vesicles secrete fluids into the testes e. the bladder sphincter is relaxed
Unlike the carbon and nitrogen cycles, the phosphorous cycle is classified as a(n) ________ cycle because phosphorus never enters the atmosphere
Fill in the blank(s) with correct word