Biology exam #2
The ___ theory states that all life is composed of one or more cells, which are the fundamental units of all life
cell
All living things are made of
cells
How many of the following organelles occur in your skin cells? Mitochondria, ribosomes, nucleus, lysosomes, chloroplasts, vacuoles, ER A-6 B-5 C-8 D-7 E-4
B-5(mitochondria,ribosomes,nucleus,lysomes and ER
Key genetic sequences suggest that archaea are more closely related to members of domain ______ than they are to members of Domain Bacteria. A-plantae B-eukarya C-monera D-chordata
B-eukarya
What 4 things are present in both prokaryotic cells and eukaryotic cells
Cytoplasm, DNA, RNA, ribosomes
What is present in bacterial cells?
Cytoplasm, enzymes, DNA, ribosomes
What did Robert Hooke call the little units he observed when he viewed cork under lenses of glass A-nuclei B-atoms C-organelles D-cells
D-Cells
What English physicist first observed the outlines of cells when he looked at cork from an oak tree? A-Leeuwenhoek B-Schwann C-schledian D-Hooke
D-Hooke
When English physicist first observed the outlines of cells when he looked at cork from an oak tree A-Schleiden B-Schwann C-Leeuwenhoek D-Hooke
D-Hooke
Whether bacterium or blue whale, every organism is made of A-organ systems B-organs C-tissues D-cells
D-cells
the head of a phospholipid ____, meaning it's polar covalent bonds attract water, but the tails of a phospholipid are __ and thus water-insoluble. A-lipid-soluble; lipid-insoluble B-non polar; polar C-hydrophobic; hydrophilic D-hydrophilic; hydrophobic
D-hydrophilic;hydrophobic
Which structure is most likely to occur in a amoeba? A-flagellum B-chloroplast C-tight junction D-plasmodesma E-cytoskeleton
E-cytoskeleton
Cholesterol is a molecule in animal cell membranes. Since cholesterol is hydrophobic, where is it the most likely to occur? A-region Y B-region X
A-Region Y
The___ microscope is ideal for viewing living cells that are between 200 nanometers and 1 millimeter in size A-light B-transmission C-scanning D-electron
A-light
What type of microscope passes light through a transparent or thinly sliced specimen to generate true -color view of cells? A-light microscope B-transmission electron microscope C-scanning electron microscope
A-light microphone
What are the three components of the cell theory in the mid-1800s
All cells originate from preexisting cells, all organisms are made of one or more cells,the cell is the fundamental unit of all life
How many of these features does a typical bacterial cell have? DNA, cell wall, nucleus, robosomes, cell membrane. A-3 B-2 C-4 D-1 E-5
C-4(DNA, cell wall,robosomes, and a cell membrane)
All cells are surrounded by a plasma membranes , that separate the cytoplasms from the___ A-golgi apparatus B-endoplasmic reticulum C-outside environment D-ribosomes
C-outside environment
In cell membranes, what part of a phospholipid molecule is oriented toward the outside of the bilayer? A-fatty acid tails B-nonpolar rings C-phosphate head D-hydrocarbon chains
C-phosphate head
The cell membrane is composed of a type of lipid molecule called a(n)__, which has two fatty acids and a phosphate group extending from a glycerol molecule A-carbohydrate B-polysaccharide C-phospholipid D-triglyceride
C-phospholipid
___ cells are the simplest forms of life and lack a nucleus A-plant B-fungal C-prokaryotic D-eukaryotic
C-prokaryotic
What are the three characteristics for eukaryotic cells
Has a nucleus, larger that prokaryotic cells, system of internal membranes
All cells have a __ that surrounds the cytoplasm and forms a boundary between the cell and its environment
Membrane
All cells have a cell___ that surrounds the cytoplasm and forms a boundary between the cell and its environment
Membrane
What are the differences between archaea and bacteria
Molecules that compose the cell membranes, evolutionary relationship to eukaryotes, chemical composition of flagella
What are the characteristics of prokaryotes
Most ancient forms of life on earth, lack a nucleus, simplest types of life
What are the roles that membranes play in cells
Transports substances into and out of the cell, receive and respond to external stimuli, enclose organelles in eukaryotic cells
