Plasma membrane phospholipids are
a. located mostly in the outer leaflet of the bilayer.
b. located mostly in the inner leaflet of the bilayer.
c. symmetrically distributed between the two membrane halves.
d. asymmetrically distributed between the two membrane halves.
Ans: d. asymmetrically distributed between the two membrane halves.
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The oldest fossil remains of Homo sapiens found so far date from about _____
A) 6 million years ago B) 1.6 million years ago C) 195,000 years ago D) 60,000 years ago E) 16,000 years ago
The human retina has several layers of cells/tissues in the eye. What is the order of appearance of these cells from the front (where light hits first) to the back of the eye?
A. rods and cones; bipolar cells; pigmented epithelium; ganglion cells B. ganglion cells; bipolar cells; rods and cones; pigmented epithelium C. rods and cones; ganglion cells; bipolar cells; pigmented epithelium D. pigmented epithelium; rods and cones; ganglion cells; bipolar cells
Chloroplasts are the site of ____
a. DNA synthesis b. cellular digestion c. protein synthesis d. photosynthesis e. lipid synthesis
An antigen is:
a. a phagocytic cell. b. used to combat infections. c. a molecule used by bacteria to destroy antibodies. d. any molecule that is recognized as foreign by the immune system. e. any molecule that is recognized as natural by the immune system.