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Challenge Yourself
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1
When a cell begins to divide, its chromatin forms
A)nucleoli.
B)chromosomes.
C)histones.
D)none of these.
2
Which of the following describes integral membrane proteins?
A)They only permit water movement into or out of the cell.
B)They only transport large proteins into the cell.
C)They extend across the phospholipid bilayer.
D)They are attached to the external membrane surface.
3
Facilitated diffusion differs from active transport in that facilitated diffusion
A)expends no ATP.
B)moves molecules from an area of higher concentration to one of lower concentration.
C)does not require a carrier protein for transport.
D)moves molecules in vesicles across a semipermeable membrane.
4
Which plasma membrane structures serve in cell recognition and act as a "personal ID card" for the cell?
A)integral proteins and peripheral proteins
B)glycolipids and glycoproteins
C)phospholipids and cholesterol
D)cholesterol and integral proteins
5
The __________ increase the outer surface area of the plasma membrane to increase absorption.
A)centrioles
B)cilia
C)microvilli
D)flagella
6
The major functions of the Golgi apparatus are
A)diffusion and osmosis.
B)detoxification of substances and removal of waste products.
C)synthesis of new proteins for the cytoplasm.
D)packaging, sorting, and modification of new molecules.
7
Interphase of the cell cycle consists of the following parts:
A)prophase, metaphase, anaphase, and telophase.
B)G1, S, and G2.
C)mitosis and cytokinesis.
D)all of these.
8
The organelle that provides most of the ATP needed by the cell is the
A)endoplasmic reticulum.
B)mitochondrion.
C)lysosome.
D)Golgi apparatus.
9
During which phase of mitosis do the sister chromatids begin to move apart from each other at the middle of the cell?
A)prophase
B)metaphase
C)anaphase
D)telophase
10
When a cell is not dividing, its DNA is in the form called
A)chromatin.
B)chromosomes.
C)genes.
D)nucleoli.







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