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.
