Questions and Answers
What is the primary function of K cells?
To recognize and kill infected cells or tumor cells
Which of the following characteristics distinguishes K cells from T cells?
Lack of expression of CD4 or CD8
What is the role of IL-2 and IL-12 in K cell activation?
To activate K cells
What is the mechanism by which K cells kill target cells?
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What is the importance of K cells in the immune response?
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Study Notes
Definition and Function
- The colon (:) is a punctuation mark used to introduce a list, quotation, or explanation.
- It is also used to separate two independent clauses when the second clause explains or amplifies the first.
Uses of Colon
- To introduce a list:
- I have three favorite foods: pizza, sushi, and tacos.
- To introduce a quotation:
- The CEO said: "We will do our best to improve the company's performance."
- To separate two independent clauses:
- I have one goal: to finish this project on time.
Differences from Semicolon
- A colon is used to introduce a list or explanation, while a semicolon (;) is used to separate two independent clauses that are closely related in meaning.
- A colon is stronger than a semicolon, implying a closer relationship between the clauses.
Placement and Spacing
- A colon is placed outside of quotation marks.
- There should be no space before a colon, but one space after it.
Common Mistakes
- Using a colon after a verb, instead of a comma.
- Using a colon to separate two independent clauses that are not closely related in meaning.
- Forgetting to capitalize the first word after a colon.
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