Down syndrome (trisomy-21) results from ________.
A. an autosomal recessive allele
B. a sex-linked mutation
C. a mutagen
D. nondisjunction
E. a teratogen
Answer: D
You might also like to view...
As the eye adjusts to focus on a near object, the cornea must change shape because the lens is unable to.
Answer the following statement true (T) or false (F)
Which of these connective tissues is NOT correctly matched with its functional characteristics?
A) blood — fluid allows cells to travel freely B) bone — strong and rigid C) elastic cartilage — recoils to original shape when bent D) hyaline cartilage — rigid with rough surface for strength E) fibrocartilage — compressible, but resists tearing or pulling forces
Microvilli
A. are supported by microtubules. B. move the cell. C. increase the surface area of the cell. D. are extensions of the lysosomal membrane. E. function to make the cell mobile.
Which type of cell has the potential to differentiate to form adult cell types?
A. Mast cell B. Macrophage C. Osteoclast D. Stem cell E. Adipocyte