All cells possess a plasma membrane, which functions to _____.
A) enclose the cell
B) isolate the cell from random disturbances in the environment
C) allow metabolic events to occur in an orderly fashion
D) all of the choices
Answer: D) all of the choices
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One day during the summer you and some friends make ice cream using an electric ice cream maker. To get the ice cream to form, a mixture of salt and ice is packed around the ice cream maker. A few days later you notice a yellow circle of dead grass where the ice cream maker had been placed. You hypothesize that some of the salt and ice mixture spilled onto the grass and ___
A. froze the grass B. was isosmotic to the grass cells causing the yellow circle of dead grass C. was hyperosmotic to the grass cells causing the yellow circle of dead grass D. was hypoosmotic to the grass cells causing the yellow circle of dead grass
A man has a mutation in a mitochondrial gene encoding a subunit of the ATP synthase complex. The mutation leads to a defective ATP synthase that is not able to synthesize ATP effectively, and this in turn leads to extreme muscle weakness in the affected individual. If this man has children, what is the likelihood that they will inherit this disease from him?
A. 100% B. 0% C. 50% D. 25% E. 75%
The process of crossover is best defined as genetic recombination that occurs between ________.
a. non-sister homologous chromatids in meiotic prophase I b. sister chromatids in meiotic prophase II c. non-sister chromatids in meiotic prophase II d. sister chromatids in meiotic prophase I
Where does a fertilized egg typically implant?
a. Cervix b. Oviduct c. Vagina d. Ovary E. Uterine lining