Final answer:
Rigatoni is the pasta with grooved tubes and straight-cut ends, distinguishable from similar pastas like penne or macaroni.
Step-by-step explanation:
The type of pasta that is described as "grooved tubes with straight-cut ends" is rigatoni. This pasta is well-known for its ridges and larger size, which can hold sauces well, making it perfect for a variety of dishes. Unlike penne, which has angled ends, or macaroni, which is typically curved and does not have grooves, rigatoni is easily recognizable by its straight-cut ends and distinctive grooves.