How many chromosomes do human gametes (egg or sperm) have?
A. 23
B. 45
C. 46
D. 47
Ans: A. 23
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You have a planar bilayer with equal amounts of saturated and unsaturated phospholipids. After testing the permeability of this membrane to glucose, you increase the proportion of unsaturated phospholipids in the bilayer
What will happen to the membrane's permeability to glucose? A) Permeability to glucose will increase. B) Permeability to glucose will decrease. C) Permeability to glucose will stay the same. D) You cannot predict the outcome. You simply have to make the measurement.
Both aquatic and terrestrial organisms must have ____ across which gas exchange can take place
a. a respiratory system b. tracheal tubes c. gills and lungs d. stratified squamous epithelial tissue e. a moist surface
Many marine mollusks have distinctive larvae which have their bodies encircled by a row of cilia. These larvae are called
A. planulae. B. zoecia. C. trochophores. D. miracidia. E. polyps.
Which of the following is of least importance when concerning the preservation of ecosystems?
What will be an ideal response?