cells and cell process

This diagram shows a Paramecium, a unicellular protist.When a chemical is added to the pond water in which the Paramecium lives, the Paramecium stops moving. Which structure is most likely affected?

1

Which is a primary function of a vacuole in a cell?

storage

Cell membranes are described as selectively permeable. Four students were asked to explain what this means and provided the answers given below.Student 1: Cell membranes prevent all materials from entering the cell. Student 2: Cell membranes only provide structural support for the cell. Student 3: Cell membranes regulate which substances can enter and exit the cell. Student 4: Cell membranes allow water and water-soluble substances to enter the cell. Which student correctly identified the function of the selectively permeable membrane?

student 3

What determines the function of a specialized cell?

the active genes in the cell

What would most likely be produced when a cell with eight chromosomes undergoes mitosis?

two cells with eight chromosomes each

During which phase of the cell cycle does most cell growth occur?

interphase

Waxes create a waterproof layer on the outside of some living organisms. To which group of organic molecules do waxes belong?

lipids

The chemical colchicine disrupts cell division. Which cell process would most likely stop if colchicine were added to a culture of human liver cells?

mitosis

Which of these cells in the human body is specialized to transport oxygen throughout the body?

B

A student noticed that the freshwater plant, Elodea, produced bubbles when placed in direct light. What could the student most likely conclude?

Bubbles of oxygen were produced as a result of photosynthesis.

Which statement best explains how sweating during exercise maintains homeostasis?

It regulates body temperature.

A student used a microscope to observe Elodea submerged in a solution. The student observed the cell cytoplasm pull away from the cell wall and clump together in the center of the cell. Which statement BEST explains why this occurred?

The cell was submerged in a hypertonic solution.

This diagram shows a red blood cell in a beaker that contains a solution with a higher salt concentration than that inside the red blood cell.What will happen to the red blood cell in this environment?

The red blood cell will shrink from losing water molecules.

Which best explains why the rate of a biochemical reaction decreases at high temperatures?

The shape of the enzyme changes.

Some individuals are unable to digest the lactose found in the milk of cows. The digestive systems of these individuals MOST likely lack which?

an enzyme that catalyzes lactose breakdown

During photosynthesis, plants convert sunlight into what substance to be used for energy?

glucose

Salivary amylase is an enzyme in humans that breaks down starches. What substance would humans have difficulty digesting without this enzyme?

carbohydrates

Plant cells are able to produce their own food. This process happens in which structure?

chloroplast

Which word equation best represents the process of cellular respiration?

glucose + oxygen → carbon dioxide + water

Which type of substances serves as a catalyst for reactions that break large food molecules into smaller useful molecules?

enzymes