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

Biology & Microbiology

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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).

Biology & Microbiology

All genes in DNA code for proteins.

a. true b. false

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology