Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

2. Cell Chemistry & Cell Components

Nucleic Acids

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Nucleic Acids

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Multiple Choice

The four nitrogenous bases commonly found if DNA are:

Adenine, thymine, cytosine, uracil

Uracil, adenine, cytosine, guanine.

Uracil, cytosine, guanine, thymine.

Adenine, thymine, cytosine, guanine.

None are correct.

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Understand that DNA is composed of four nitrogenous bases that pair specifically to form the rungs of the DNA double helix.

Recall the base pairing rules for DNA: Adenine (A) pairs with Thymine (T), and Cytosine (C) pairs with Guanine (G).

Identify the four nitrogenous bases found in DNA: Adenine, Thymine, Cytosine, and Guanine.

Recognize that Uracil is not found in DNA; it is a base found in RNA, where it replaces Thymine.

Review the options provided and select the one that lists the correct four nitrogenous bases found in DNA: Adenine, Thymine, Cytosine, and Guanine.

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Related Practice

Textbook Question

Which of the following is not part of a nucleotide?

a. An amino acid

b. A nitrogenous base

c. One or more phosphate groups

d. A sugar

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Textbook Question

Mark the following properties as belonging to either DNA or RNA.

a. Contains the nucleotides A, G, C, and U _________

b. Found only in the nucleus of the cell _________

c. Can move in and out of the cell's nucleus _________

d. Contains two strands of nucleotides linked by hydrogen bonds _________

e. Contains the code for every protein in the body _________

f. Contains the sugar ribose _________

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Textbook Question

The drug methotrexate is used to treat several different types of cancer and diseases of the immune system. It works by inhibiting an enzyme in the cell necessary for folic acid synthesis. Without folic acid, the cell cannot make nucleotides. What, specifically, does an enzyme do in the cell? Why would inhibiting this enzyme disrupt folic acid synthesis? What effect would a disruption in folic acid synthesis have on the cell as a whole? (Hint: Think about the role that folic acid plays in the cell.) (Connects to Chapter 2)

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Multiple Choice

Which of the following descriptions best fits the class of molecules known as nucleotides?

Which of the following statements about DNA structure is true?

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