Which of the following statements is true regarding T cell receptors? Select all correct
A. They recognize antigen-MHC complexes.
B. They contain variable and constant
regions.
C. They are composed of two heavy (H)
chains and two light (L) chains.
D. They are formed by the rearrangement of
V, J, C, and D gene segments.
E. They can be found in the bloodstream
independent of T cells.
A,B,D
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A plant seedling bends toward sunlight because _____
A) auxin migrates to the lower part of the stem due to gravity B) there is more auxin on the light side of the stem C) auxin is destroyed more quickly on the dark side of the stem D) auxin is found in greatest abundance on the dark side of the stem E) gibberellins produced at the stem tip cause phototropism
For reliable results, the niacin test should be performed only from cultures that are at least:
a. 2 weeks old and show at least five colo-nies on Löwenstein-Jensen medium. b. 3 weeks old and show at least 50 colonies on Löwenstein-Jensen medium. c. 3 weeks old and show at least 50 colonies on Middlebrook 7H11 agar. d. 2 weeks old and show at least five colo-nies on Middlebrook 7H11 agar.
Egg cells are fertilized in the
A. cervix. B. vagina. C. ovary. D. oviduct.
An organism that obtains its nutrition from dead organic matter is a:
A) saprophyte. B) phytoplankton. C) parasite. D) neophyte.