Cellular Transport

Transmembrane proteins span the width of cell membranes. Four types of transmembrane proteins are shown in a section of cell membrane.

Las proteínas transmembrana abarcan el ancho de las membranas celulares. Cuatro tipos de proteínas transmembrana se muestran en una sección de la membrana celular.

• stop chemical reactions within the cell

• synthesize molecules that signal other cells

• help the cell interact with its external environment

• remove large waste particles from the cytoplasm of the cell

This picture represents which type of cellular transport?

¿Esta imagen representa qué tipo de transporte celular?

• passive transport
• endocytosis
• exocytosis
• osmosis

Which statements best compare the function of an ATP molecule to a DNA molecule?

¿Qué enunciados comparan mejor la función de una molécula de ATP con una molécula de ADN?

• ATP carries and transmits the genetic information of organisms. DNA serves as a biological catalyst that speeds up the rate of chemical reactions.

• ATP provides energy for chemical reactions in the cell. DNA carries and transmits the genetic information of organisms.

• ATP serves as a biological catalyst that speeds up the rate of chemical reactions. DNA acts as a structural sugar in the cell walls of plants

• ATP acts as a structural sugar in the cell walls of plants. DNA provides energy for chemical reactions in the cell.

Which statement describes the process of osmosis in an animal cell?

¿Qué enunciado describe el proceso de ósmosis en una célula animal?

• Sugar molecules move across the plasma membrane until the cell has enough energy to grow in size and divide

• Water molecules move across the plasma membrane until solute concentrations are equal on both sides of the membrane.

• Ions move across the plasma membrane until the inside of the cell has a higher concentration of positive charges.

• Enzymes move across the plasma membrane until the cell has completed metabolism.

Cell have several mechanisms for regulating their internal environments. Which of these mechanisms involved in maintaining homeostasis requires energy?

Las células tienen varios mecanismos para regular sus ambientes internos. ¿Cuál de estos mecanismos implicados en el mantenimiento de la homeostasis requiere energía?

• osmosis

• diffusion

• active transport

• passive transport

Some students used vinegar to dissolve away the shells of three eggs and used the eggs as models of human red blood cells. The students observed the changes in the eggs when they were placed in different solutions. (View Image).

Which statement best describes the role of the cell membrane in this model?

Algunos estudiantes usaron vinagre para disolver las cáscaras de tres huevos y usaron los huevos como modelos de glóbulos rojos humanos. Los estudiantes observaron los cambios en los huevos cuando se colocaron en diferentes soluciones. (Ver imagen)

¿Qué afirmación describe mejor el papel de la membrana celular en este modelo?

• The cell membrane is an impermeable barrier that prevents water from entering the cell.

• The cell membrane allows solutes to enter the cell, which causes the cell to shrink.

• The cell membrane allows water to enter and leave the cell.

• The cell membrane removes solutes from the environment.

This diagram shows cellular activity across a cell membrane.

Which two processes does this diagram most directly model?

Este diagrama muestra la actividad celular a través de una membrana celular.

¿Qué dos procesos modela más directamente este diagrama?

• Energy conversions and synthesis of new molecules

• Synthesis of new molecules and homeostasis

• Transport of molecules and energy conversions

• Homeostasis and transport of molecules

In PASSIVE TRANSPORT, substances move from:

En el TRANSPORTE PASIVO, las sustancias se mueven desde:

• High concentration to low concentration

• Low concentration to high concentration

In ACTIVE TRANSPORT, substances move from:

En el TRANSPORTE ACTIVO, las sustancias se mueven desde:

• High concentration to low concentration

• Low concentration to high concentration

What type of transportation is depicted in this picture?

¿Qué tipo de transporte se representa en esta imagen?

• Osmosis

• Exocytosis

• Endocytosis

• Facilitated Diffusion