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
Captionless Image
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.
Please post your answers, and someone will check them for you.
sheesh
1. To determine the major components of living organisms, we need to recall the elements that form the building blocks of organic molecules. These elements include carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus. Among these options, only carbon (option a) is one of the major components of living organisms. Therefore, the correct answer is a. carbon.
2. The question asks for true statements about carbon atoms. To determine the correct answer, we must consider the given statements and evaluate their accuracy.
Statement I: Carbon atoms can form four covalent bonds. This is true as carbon has four valence electrons, allowing it to form up to four covalent bonds.
Statement II: Carbon atoms have the ability to form long chains or rings. This is also true as carbon atoms can form covalent bonds with other carbon atoms, creating long chains or closed rings.
Statement III: Carbon atoms can form double or triple bonds. This is true as carbon atoms can share two or three pairs of electrons with other atoms, forming double or triple bonds.
Considering that all three statements are true, the correct answer is c. I, II, and III.
3. The question asks for the elements that comprise complex molecules found in living systems such as carbohydrates, fats, proteins, and nucleic acids. To determine the correct answer, we need to recall the elements commonly found in these molecules.
Among the given options, b. carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, is the correct answer. These elements are essential for the structure and function of complex molecules in living systems.
4. The question asks for the main function of nucleic acids, one of the four major macromolecules. To determine the correct answer, we need to recall the functions of nucleic acids.
Nucleic acids, such as DNA and RNA, carry genetic material that contains instructions for the synthesis of proteins and the regulation of cellular activities. They serve as the blueprint for creating structures and molecules inside the cell. Therefore, the correct answer is c. carry genetic material that helps to create structures inside the cell.