Which of the following describe characteristics of sclerenchyma cells? Select all that apply.A) Their function is primarily to transport oxygen and carbon dioxide throughout the leaf.B) They have thick, tough secondary walls.C) Their secondary walls may be impregnated with lignin.D) They form fibers and sclereids.E) They lack living protoplasts when mature.
What will be an ideal response?
B, C, D, E
Unlike other cells derived from ground tissue, sclerenchyma die at maturity. Their secondary cell wall is lignified that makes the cell very rigid and this adds strength to the plant tissue.
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Hfr cells are cells that can integrate the F factor and some genes into the bacterial chromosome. Hfr
cells can do this through:
a. mitosis. b. meiosis. c. prophase. d. crossing over. e. transduction.
The first cell seen by Robert Hooke using a
microscope was a a. cork cell. b. cell from an insect’s eye. c. sperm cell. d. protist cell. e. bacterial cell.
A chromosome contains the following gene order: A B C D • E F G H Which of the following rearrangements represents a paracentric inversion?
A) A B C • D E F G H B) A F G H • B C D E C) A C B D • E F G H D) A F D E • C B G H E) A B C D • H G F E
Integrins are
a. transmembrane proteins. b. peripheral membrane proteins. c. components of the extracellular matrix. d. components of a desmosome.