BIO156 Quiz 2: Lessons 3 and 4

BIO156 Quiz 2: Lessons 3 and 4

Subject: Biology    / General Biology
Question
1 of 30
Light microscopes
can generally magnify objects about 10,000 times without blurring.
typically provide more resolution than an electron microscope.
work by reflecting electrons off the surface of an object being studied.
use light and glass lenses to magnify an image.
All of the choices are correct.
Question
2 of 30
A scanning electron microscope is used to study __________, whereas a transmission electron microscope is used to study __________.
live cells . . . dead cells
cell surfaces . . . internal cell structures
dead cells . . . live cells
internal cell structures . . . cell surfaces
plant tissue . . . animal tissue
Question
3 of 30
Which of the following statements is consistent with the Cell Theory?
All cells originate spontaneously without prior parent cells.
The cell is the basic structural and functional unity of life.
Cells can only function when associated with other like cells.
Many kinds of living things are not made of cells at all.
Cells of living things all contain the same number and kind of interior organelles.
Question
4 of 30
We can characterize the fluid mosaic model of a membrane as ____________ floating in a sea of ___________
lipids; protein
proteins; lipid
phospholipids; carbohydrate
fats; water
glucose; amino acids
Question
5 of 30
Large, round cells can overcome surface area to volume problems by
becoming larger and rounder.
increasing their size by at least twice.
becoming smaller, narrower or flatter.
increasing the amount of cytoplasm within the cell membrane.
Question
6 of 30
As cell size increases, the
volume and surface area decrease.
volume increases faster than the surface area.
surface area increases faster than the volume.
surface area and volume increase at the same rate.
None of the choices are correct.
Question
7 of 30
Cells that lack a membrane-bound nucleus are __________ cells.
plant
animal
prokaryotic
eukaryotic
fungal
Question
8 of 30
The membranous compartmentalization of a cell
divides the cell into two equal-sized halves.
allows different metabolic processes to occur simultaneously.
requires the presence of a cell wall.
requires the presence of a large central vacuole.
is common in prokaryotes and eukaryotes.
Question
9 of 30
If a biologist said that eukaryotic cells get their power from bacteria, they would be referring to
cells that break down bacteria to provide energy for life.
the bacteria in our large intestines that digest food for us.
the mitochondria in our cells that may have originated as endosymbiotic bacteria.
infectious bacteria that make our bodies work harder to fight infections.
Question
10 of 30
Long fibers of DNA and protein are called a
chromatin.
nucleolus.
ribosome.
lysosome.
central vacuole.
Question
11 of 30
Smooth endoplasmic reticulum
stores calcium ions in muscle cells.
is the major site of carbohydrate synthesis in eukaryotic cells.
produces proteins for cell membranes.
produces antibodies.
helps assemble ribosomes for protein synthesis.
Question
12 of 30
Secretory proteins are
produced by ribosomes on the smooth endoplasmic reticulum.
chemically modified in the nucleus.
produced by the cell for internal use.
released from the cell through the plasma membrane.
incorporated into the mitochondrial membrane.
Question
13 of 30
The Golgi apparatus
is composed of stacks of membranous vesicles that are continuous with one another.
stores, modifies, and packages proteins.
strings together amino acids to produce proteins.
forms fats from glycerols and fatty acids.
is the site of carbohydrate breakdown.
Question
14 of 30
Lysosomes
help to digest worn-out or damaged organelles.
recycle materials within the cell.
fuse with food vacuoles to expose nutrients to lysosomal enzymes.
destroy harmful bacteria engulfed by white blood cells.
All of the choices are correct.
Question
15 of 30
Contractile vacuoles
are generally found in protists that inhabit salt water.
help in the excretion of excess salt.
prevent cells from bursting as a result of the influx of excess water.
allow organisms to avoid dehydration by absorbing water from the environment.
All of the choices are correct.
Question
16 of 30
Cilia differ from flagella in that
cilia are composed of microfilaments and flagella are composed of intermediate filaments.
cilia contain nine microtubule doublets surrounding a central pair of microtubules; flagella contain only nine microtubule doublets.
the protein filaments of cilia are naked; those of flagella are wrapped in an extension of the cell membrane.
cilia are typically more numerous and shorter than flagella.
cilia are anchored only in the proteins of the cell membrane; flagella are anchored in a special structure called the basal body.
Question
17 of 30
Plants with rigid cell walls are unable to do which process?
diffusion
osmosis
active transport
phagoctyosis
Question
18 of 30
Which of the following cell structures is not associated with the breakdown of harmful substances or substances that are no longer needed by the cell?
lysosomes
mitochondria
peroxisomes
vacuoles
All of the choices play a role in these functions.
Question
19 of 30
Small, nonpolar, hydrophobic molecules such as fatty acids
easily pass through a membrane’s lipid bilayer.
very slowly diffuse through a membrane’s lipid bilayer.
require transport proteins to pass through a membrane’s lipid bilayer.
are actively transported across cell membranes.
usually enter the cell via endocytosis.
Question
20 of 30
Membrane phospholipids
have hydrophobic heads that face the center of the membrane and are shielded from water.
have hydrophilic tails that face outward and are exposed to water.
often have “kinks” in their tails caused by the presence of a single rather than a double bond between carbons.
remain fluid because they are tightly packed against one another.
None of the choices are correct.