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A scientist wants to study the effects of a new Drug X on cancer cell growth. Equal numbers of cancerous liver cells are grown on ten plates in a lab.  Drug X is added to five plates.  Water is added to the other five plates.  The ten plates of cancerous cells are incubated at 37 Celsius for two days.  After two days the plates are removed from the incubator and the number of cells is counted on each plate.   What is a control variable? 

Name the specific part of the microscope that allows the user to increase or decrease the amount of light passing through the sample.  This allows the used to adjust the contrast.    

What is the purpose of the condenser on the light microscope?   

El presente progresivo What do these people do at different times during the day? Match each sentence fragment with the phrase that best completes it using the present progressive.

Ser o estar (Part II) Select the appropriate forms of ser or estar. ¿Dónde [1] la cafetería? Nosotros [2] estudiantes de TCC. [3] muy triste. ¡Toda la casa [4] limpia! Ana y Sara [5] de Puerto Rico. El regalo (gift) [6] para mi hermana. ¿Qué hora [7] ? Mi color favorito [8] azul. Mi madre [9] furiosa conmigo (with me). Mi hermano [10] alto y moreno. Mi alcoba [11] desordenada. Las puertas [12] abiertas.

Identify structure 1.   

Las partes de la casa (Part I) Indicate the room or object typically associated with each activity. Normalmente, preparo la comida (food) en [1]. Todos los días me levanto de [2]. Nos duchamos en [3]. Por la noche me acuesto en [4]. En casa, mi padre trabaja en [5].

Identify structure C. (half of the purple x) 

Record the volume of the fluid in the apparatus to the nearest mL. 

What is the specific name of the this piece of lab equipment?