The tubes both contain enzyme and substrate.  One was placed at 5

Esteban ___________ al mediodía en la cafetería

Name the enzyme  used in the potato/apple lab.

To act as PIC of a high performance airplane, which training or experience would meet the additional requirements?

(less inteligente than) Marisol es __________ su hermana mayor.

Identify the structure the arrows point to. (light grey) 

Ana y Enrique__________ unos refrescos.

Le escribí la carta.

What is the one scientific word used to describe plant cells in a hypotonic solution? 

An aircraft carrying passengers for hire has been on a schedule of inspection every 100 hours of time in service. Under which condition, if any, may that aircraft be operated beyond 100 hours without a new inspection?