Refer to the figure. If you examine side A after three days, you should find _____
A) a decrease in the concentration of NaCl and glucose and an increase in the water level
B) a decrease in the concentration of NaCl, an increase in water level, and no change in the concentration of glucose
C) no net change in the system
D) a decrease in the concentration of NaCl and a decrease in the water level
E) no change in the concentration of NaCl and glucose and an increase in the water level
Answer: D
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The insertion of a skeletal muscle is
(a) attached to the less mobile portion of the skeleton. (b) attached to the portion of the skeleton that moves when the muscle contracts. (c) never attached to the skeleton. (d) its belly.
The smallest type of genetic change that can occur within a given gene is called _______ an example of this phenomenon occurs with ___________.
A. gene transfer; chromosomal deletion. B. single-nucleotide polymorphism; the ?-globin gene. C. synaptic transfer; mitosis. D. double-nucleotide polymorphism; phenylketonuria. E. All of these are correct.
When lipids, phosphates, carbohydrates and RNA were placed on clay, a liposome was formed. Why was the clay an important surface for liposome formation and how is RNA associated with the liposome?
A. Clay acts as a catalyst for the formation of a liposome that can grow and divide. The RNA molecules are enclosed inside the lipid bilayer. B. Clay causes anions to stick together, while the cations are pulled from the carbohydrates. This chemical reaction causes the formation of a carbohydrate- and RNA-based membrane. C. The clay surface provides a nutritional media for the growing and dividing liposome. RNA is incorporated into the liposome as a transmembrane catalyst. D. The positively charged clay surface reacts with the negatively charged phospholipids to create a clay ball. RNA molecules adhere to the outside surface of the clay ball. E. Phospholipds react chemically with the negatively charged clay surface, creating an impermeable membrane. The RNA molecules WOULD be incorporated as part of this membrane.
The source of norepinephrine is the
a. pituitary gland. b. adrenal cortex. c. adrenal medulla. d. thymus gland. e. thyroid gland.