In an experimental procedure, the researcher has established multiple levels of a chemical, or amounts of light, or some other factor at the beginning of the experiment, in order to determine if and how much the biological system responds. The manipulated factor at varying levels is the
A. Both control group and standardized variable are correct.
B. control group.
C. independent variable.
D. standardized variable.
E. dependent variable.
C. independent variable.
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How are the tails and heads of membrane phospholipids oriented in their environment?
A. The hydrophobic heads are oriented towards each other and the hydrophillic tails are oriented towards the extracellular fluid and the intracellular fluid. B. The hydrophillic tails are oriented towards each other and the hydrophobic heads are oriented towards the extracellular fluid and the intracellular fluid. C. The hydrophobic tails are oriented towards each other and the hydrophillic heads are oriented towards the extracellular fluid and the intracellular fluid. D. The hydrophillic heads are oriented towards each other and the hydrophobic tails are oriented towards the extracellular fluid and the intracellular fluid.
The eukaryotic cell membrane is composed of ________.
A. phospholipids B. sterols C. sterols, proteins, and phospholipids D. sterols and phospholipids only E. proteins
Four of the five answers listed below are targets of the immune system. Select the exception
a. virus b. normal cells c. cancer cells d. bacteria e. debris and dead cells
A novice gardener notices that many plants in his garden look wilted. What osmotic solution would you suggest the novice gardener use to best return the plants to full health?
A. Place the plants in a 5% solute solution so water can diffuse into the plant cells. B. Place the plants in a 15% solute solution so water can be actively transported out of the plant cells. C. Place the plants in a 5% solute solution so water can be actively transported out of the plant cells. D. Place the plants in a 15% solute solution so water can diffuse out of the plant cells.