Which of the following is the correct order of the tissues in a young dicot stem, from the center of the stem outward?
A) Pith ? cortex ? phloem ? xylem ? vascular cambium ? epidermis
B) Cortex ? xylem ? vascular cambium ? phloem ? pith ? epidermis
C) Cortex ? vascular cambium ? xylem ? phloem ? epidermis ? pith
D) Pith ? phloem ? cortex ? xylem ? vascular cambium ? epidermis
E) Pith ? xylem ? vascular cambium ? phloem ? cortex ? epidermis
E
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Most polymorphisms do not result in a phenotypic difference because they are typically
A) nonsense mutations. B) either missense or neutral mutations. C) either silent mutations or are in non-coding regions. D) either missense mutations or are in promoter regions.
The accompanying illustration shows one possible outcome of the random alignment of homologous chromosomes at
metaphase I. How many OTHER possible arrangements exist?
a. none b. one c. two d. seven e. eight
The exchange of gases in the human lungs occurs
through the a. bronchi. b. alveoli. c. bronchioles. d. tracheas. e. glottis.
________ immunity deals with microbes circulating in your bloodstream, whereas ________ immunity deals with microbes hiding within body cells
Fill in the blank(s) with correct word