1. Molecules based on __________ are the major components of living organisms. *
1 point
a. carbon
b. nitrogen
c. sulfur
d. calcium
2. Which of the following statements are true about carbon atoms? *
1 point
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a. I and II only
b. I and III only
c. I, II and III
d. None of the above
3. Living systems are made of complex molecules including carbohydrates, fats, proteins, and nucleic acids. Even though there are more than 100 elements known to exist, these molecules are comprised of only a few elements. What are these elements? *
1 point
a. sodium, potassium, calcium, nitrogen, phosphorus, sulfur
b. carbon, hydrogen, oxygen, nitrogen, sulfur and phosphorus
c. carbon, hydrogen, oxygen, fluorine, chlorine, iodine
d. fluorine, chlorine, iodine, nitrogen, phosphorus, sulfur
4. Nucleic acids are one of the four major macromolecules. The main function of nucleic acids is to *
1 point
a. act as enzymes, cell signals, and structural support for the cell.
b. absorb energy from the Sun and transport it around the cell.
c. carry genetic material that helps to create structures inside the cell.
d. aid in development, the immune system, and blood clotting.
2 answers