The major structural components of a cell membrane are ____
a. phospholipids and cellulose
b. phospholipids, protein, and sterols
c. protein and sterols
d. glycolipids and proteins
e. phospholipids and glycolipids
B
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Rainforests, old growth forests, and coral reefs are examples of biological __________
Fill in the blank(s) with the appropriate word(s).
All genes in DNA code for proteins.
a. true b. false
Early animal embryos are composed of stem cells, unspecialized cells that are capable of dividing and renewing themselves for long periods
If a stem cell divides by mitosis so that one cell eventually becomes part of the brain and the other cell becomes part of a salivary gland, the cells have A) differentiated. B) diffused. C) taken up genes from surrounding cells. D) lost genes. E) increased their genetic variability.
Amniotic fluid is produced by ____ and then reabsorbed by ____.
A. Amnion then Maternal Tissue; Fetal Swallowing B. Amnion then Maternal Tissue; Placenta C. Placenta; Fetal Epidermis D. Placenta; Fetal Swallowing E. Placenta; Placenta