MCQ
Which of the following statements is correct$?$
- AAdenine does not pair with thymine
- ✓Adenine pairs with thymine through two $H-$bonds
- CAdenine pairs with thymine through one $H-$bond
- DAdenine pairs with thymine through three $H-$bonds
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

$R$ - With the help of $PCR$ thousand of $DNA$ copies are formed
| a. | Trophoblast | i. | Embedding of blastocyst in the endome trium. |
| b. | Cleavage | ii. | Group of cells that would differentiate as embryo. |
| c. | Inner cell mass | iii. | Outer layer of blastocyst attached to the endometrium. |
| d. | Implantation | iv. | Mitotic division of zygote. |