Biology chapter 7

Not all cells are alike. Which of the following is NOT a true statement about differences between cells?

Most cells have a membrane, but some do not.

Who used a compound microscope to see chambers within cork and named them "cells"?

Robert Hooke

Which of the following best describes the relationship between the nucleus and the cytoplasm?

The nucleus is an organelle that is surrounded by the cytoplasm.

Which of the following statements about the nucleus is NOT true?

The nucleus is the site of protein assembly.

Which of these is NOT true of cells?

They are much like empty rooms.

Unlike the cell membrane, the cell wall is

a rigid structure

A group of similar cells that perform a particular function is called

a tissue

The cells of unicellular organisms are

able to carry out all of the functions necessary for life.

Which means of particle transport is shown in Figure 7-4 above?

active transport

Which means of particle transport requires input of energy from the cell?

active transport

Colors seen in images made from electron microscopes are

added to make certain structures easier to see.

Which of the following organisms are prokaryotes?

bacteria

Which of the following structures serves as the cell's boundary from its environment?

cell membrane

Which of the following activities is NOT a way that unicellular organisms maintain homeostasis?

cell specialization

During diffusion, when the concentration of molecules on both sides of a membrane is the same, the molecules will

continue to move across the membrane in both directions.

Which of the following enclose their DNA in a nucleus?

eukaryotes

A cell in a multicellular organism must be able to carry out all of the functions necessary for life in order for the organism to survive.

false

Cilia and flagella are made of protein filaments called endoplasmic reticulum.

false

Ribosomes that synthesize proteins are found on the smooth endoplasmic reticulum.

false

Structure D represented in Figure 7-6 is the smooth endoplasmic reticulum.

false

Which of the following is an example of an organ?

heart

Which of the following is a function of the cytoskeleton?

helps a cell keep its shape

Which term describes the relatively constant internal physical conditions of an organism?

homeostasis

Looking at a cell under a microscope, you note that it is a prokaryote. How do you know?

it lacks a nucleus.

Which organelles are involved in energy conversion?

mitochondria and chloroplasts

Which organelle converts the chemical energy stored in food into compounds that are more convenient for the cell to use?

mitochondrion

The diffusion of water across a selectively permeable membrane is called

osmosis

Which sequence correctly traces the path of a protein in the cell?

ribosome, endoplasmic reticulum, Golgi apparatus

Which of the following is a function of the nucleus?

stores DNA

Which structure in the cell shown in Figure 7-3 above modifies, sorts, and packages proteins and other materials for storage or release from the cell?

structure A

Which structure in the cell shown in Figure 7-2 above stores materials, such as water, salts, proteins, and carbohydrates?

structure C

What advance in technology made the discovery of cells possible?

the microscope

Moving materials from an area of low concentration to an area of high concentration requires active transport.

true

Once equilibrium is reached, roughly equal numbers of molecules move in either direction across a semipermeable membrane, and there is no further change in concentration on either side of the membrane.

true

There is a division of labor among the cells of multicellular organisms.

true

An organ system is a group of organs that

work together to perform a specific function.