Purines are generally abbreviated as

Options

A. R
B. Y
C. C
D. U

Explanation

To answer the question "Purines are generally abbreviated as", we can follow these steps:

### Step 1: Understand the Definition of Purines
Purines are a type of nitrogenous base found in nucleic acids (DNA and RNA). They are one of the two categories of nitrogenous bases, the other being pyrimidines.

**Hint:** Remember that purines are one of the two main types of nitrogenous bases in nucleic acids.

### Step 2: Identify the Purines
The two main purines are adenine (A) and guanine (G). These bases are essential components of DNA and RNA.

**Hint:** Recall that adenine and guanine are the specific purines you need to remember.

### Step 3: Learn the Abbreviation for Purines
In biochemistry, purines are often collectively abbreviated as "R". This abbreviation is used to represent the purine bases when discussing nucleotides.

**Hint:** Think about how abbreviations simplify complex terms in biology.

### Step 4: Conclusion
Thus, the correct answer to the question is that purines are generally abbreviated as "R".

**Final Answer:** Purines are generally abbreviated as R.