Cook linguine according to package directions. Meanwhile, in a large skillet, saute onion in oil until tender. Add zucchini; cook for 2 minutes or until crisp-tender. Stir in garlic; cook 1 minute longer.
Drain clams, reserving 1/2 cup juice. Add the clams, mushrooms, bouillon, basil, pepper and reserved juice to the skillet. Bring to a boil. Reduce heat; simmer, uncovered, for 5 minutes or until vegetables are tender. Drain linguine; top with clam mixture. Sprinkle with cheese.