Phospholipids have the ability to spontaneously form membranes when placed in water. Why was this important in the origin of life on Earth?
A. Membranes are used by cells to store genetic information.
B. Membranes are used by cells to catalyze reactions.
C. Membranes protect a cell from gases in the atmosphere.
D. Membranes are used by cells to isolate their contents from the environment.
E. Membranes protect a cell from high temperatures and pressures in the environment.
D. Membranes are used by cells to isolate their contents from the environment.
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In an egg, cytoplasmic localization of mRNA occurs when the transcripts
a. are bound to specific proteins. b. are small enough. c. are attached to fat soluble molecules. d. contain specific introns.
e. are attached to ribosome subunits manufactured in the nucleus.In which one of the following processes is light energy converted to ATP, which is then used to synthesize organic molecules?
a) Photosynthesis b) Krebs cycle c) Fermentation d) Glycolysis
Vocal cords are made of:
a. smooth muscle b. cartilage c. skeletal muscle d. ligaments e. tendons
Suppose 200 fish are marked and released in a pond. The following week, 200 fish are caught and 100 of them have marks. There are about ________ fish in this pond
Fill in the blank(s) with correct word