The complex polysaccharide that provides flexibility to the primary walls of collenchyma cells is called ____.
A. cellulose
B. lignin
C. fiber
D. pectin
E. cuticle
Answer: D
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Parental care in dinosaurs, crocodiles, and birds is an example of
A. homoplasy caused by convergence. B. homoplasy caused by common descent. C. homoplasy caused by evolutionary reversal. D. homology caused by convergence. E. homology caused by common descent.
The three primary meristems are the ____________, which forms the epidermis; the procambium, which produces primary vascular tissues (primary xylem and primary phloem); and the ground meristem, which differentiates further into ground tissue.
Choose the letter of the best match: A. protoderm B. vascular cambium C. apical meristem D. procambium E. ground meristem
For a healthy woman under age 30 with regular menstrual periods and having sex regularly but not using birth control, pregnancy typically occurs
A) in two weeks. B) in one month. C) in three or four months. D) in about one year.
Nonphagocytic (eosinophils/monocytes/NK cells) are a type of lymphocyte which produce toxins to kill abnormal cells
What will be an ideal response?