3.12 Mid-Unit Test: Cell Biology - Part 1

Which statement is true of both active transport and facilitated diffusion?

Both involve proteins in the cell membrane.

Which statement is part of the cell theory?

All cells are produced from other cells.

Semipermeable cell membranes are made of phospholipids that form a bilayer. What major benefit does this arrangement of the membrane provide to the cell?

Both surfaces of the membrane can interact with water and other molecules.

Read the paragraph. Despite its name, the Pacific sea horse is actually a type of fish. Its horse-shaped head gives it its name. This creature lives in the Pacific waters off the west coast of the Americas, from Peru to Southern California. Like many other ocean fish, sea horses face the constant challenge of losing water to their saltier environment. When a sea horse sees a predator, its nervous system kicks into high gear. Which structure is responsible for transmitting signals from one nerve cell to the next?

Cell membrane

Where does most of the metabolic activity in the cell occur?

Cytoplasm

Which term names the process whereby molecules in vesicles are exported out of the cell?

Exocytosis

The inner membrane of mitochondria consists of many folds. What is the purpose of this membrane?

Increase the surface area to allow more space for ATP synthesis

Read the paragraph. Despite its name, the Pacific sea horse is actually a type of fish. Its horse-shaped head gives it its name. This creature lives in the Pacific waters off the west coast of the Americas, from Peru to Southern California. Like many other ocean fish, sea horses face the constant challenge of losing water to their saltier environment. When the sea horse eats a meal, its body breaks down organic molecules in the food. Some of those molecules enter cellular respiration, which ultimately produces the molecule ATP. In which part of the sea horse's cells is ATP produced?

Mitochondria

Which phrase best defines diffusion?

Movement of particles from a region of high concentration to a region of low concentration

Which process does osmosis involve?

Movement of water across a cell membrane

In a eukaryotic cell, where is most of the DNA located?

Nucleus

Read the paragraph. Despite its name, the Pacific sea horse is actually a type of fish. Its horse-shaped head gives it its name. This creature lives in the Pacific waters off the west coast of the Americas, from Peru to Southern California. Like many other ocean fish, sea horses face the constant challenge of losing water to their saltier environment. When a Pacific sea horse's body loses water to its environment, which process is responsible?

Osmosis

In multicellular organisms, which term tells the highest level of cellular organization?

Systems

Which structure would not be found in a prokaryotic cell?

Membrane-bound organelles

Which statement is true of eukaryotes but not of prokaryotes?

They must contain a nucleus.