Why do we have storage macromolecules, such as fats, in our bodies?
A. Macromolecules, such as fats, are a convenient way to store kinetic energy.
B. We can break down these macromolecules to provide energy for the endergonic reactions in our bodies.
C. Breaking down macromolecules, such as fats, is an endergonic process.
D. Human cells can directly capture the energy of sunlight through photosynthesis and store it as macromolecules such as fats.
Answer: B
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________ is a polymer of glucose.
A. Triglyceride B. Cellulose C. DNA D. Protein E. RNA
Which type of nutrient can pass across epithelial cells without any expenditure of ATP?
A. iron B. calcium C. protein D. fat E. magnesium
Suppose that you performed a version of the Hershey and Chase experiment, this time using 32P-labelled viruses that insert their DNA into the DNA of the cells that they infect. Also suppose that the viral DNA is then treated as part of the cell's own DNA, and is replicated during DNA replication and passed on to daughter cells when the cell divides. You infect a population of cells with the 32P-labelled viruses, and then let the infected cells go through two generations of cell divisions. In how many cells should you find 32P-labelled DNA?
a. in none of them b. in about one-quarter of them c. in about one-half of them d. in about three-quarters of them
Which of these statements concerning the functional characteristics of the heart chambers is NOT correct?
A. During ventricular diastole, blood collects in the right and left atria. B. At the very beginning of ventricular diastole, blood flows directly from the atria into the relaxed ventricles. C. 70% of ventricular filling occurs before the atria contract. D. During ventricular systole, the atrioventricular valves close. E. During ventricular diastole, the semilunar valves open.