This site is 100% ad supported. Please add an exception to adblock for this site.



undefined, object
copy deck
What is the word for membrane proteins that have carbohydrates attached to them?
Which membrane proteins increase the rate of chemical reactions?
enzymatic proteins
The major lipids in biological membranes are called ________.
In biological membranes, the phospholipids are arranged in a:
bilayer with the fatty acids pointing toward one another.
What structure in the membrane causes plasma membranes to resist freezing?
unsaturated fatty acid tails
Within the fluid mosaic of a plasma membrane, what is the role of transport and channel proteins?
They permit salts and sugars to move through the plasma membrane.
Recognition proteins are most important for:
distinguishing foreign cells from "self" cells
In general, which of the following is largely responsible for moving substances across the plasma membrane, communicating with other cells, and identifying the cell?
What prevents your immune system from attacking your own cells?
recognition proteins
The main lipids found in cell membranes are:
Which of the following groups includes carrier and channel proteins?
transport proteins
Which of the following types of membrane proteins are responsible for conveying external messages such as those sent by a hormone signal?
receptor proteins
A molecule moves down its concentration gradient using a transport protein in the plasma membrane. This is an example of
facilitated diffusion.
Water crosses the plasma membrane
through facilitated diffusion or diffusion.
The sodium-potassium pump uses energy from ATP to move sodium ions out of the cell, and potassium ions into the cell. This is an example of
active transport
The plasma membrane forms a pocket that pinches inward, forming a vesicle that contains material from outside the cell. This describes the process of
The most common energy carrier molecule in living organisms is:
A "high-energy" bond in an ATP molecule is located between:
two phosphate groups.
Which molecule functions in the short-term storage of energy?
adenosine triphosphate
Enzymes are _____.
An enzyme _____.
is an organic catalyst
What name is given to the reactants in an enzymatically catalyzed reaction?
As a result of its involvement in a reaction, an enzyme _____.
is unchanged
Which of the following lowers the activation energy of a biochemical reaction?
Which of the following functions as a biological catalyst?
Animals have enzymes that break apart starch molecules but not cellulose, despite the fact that both are made up of glucose subunits. Which enzyme characteristic BEST explains this?
Enzymes are highly specific.
What is the ultimate source of energy for almost all forms of life on Earth?
solar energy
Which of these equations best summarizes photosynthesis?
6 CO2 + 6 H2O → C6H12O6 + 6 O2
The light reactions of photosynthesis use _____ and produce _____.
water ... NADPH
What is the purpose of a cuticle on a leaf?
to prevent water loss
How is O2 involved in photosynthesis?
O2 is a product of the light reactions.
Before photosynthesis evolved, ________ was rare in Earth's atmosphere.
The products of photosynthesis are:
glucose and oxygen.
The cellular organelle that is responsible for photosynthetic activity is the:
_____ has a longer wavelength than _____.
Red ... green
You place a plant in a transparent box made of greenish-yellow plastic. How does this affect photosynthesis for the plant?
None of the plant pigments will be able to absorb the light. Photosynthesis will stop.
Why do plant leaves appear green?
The chlorophyll in leaves reflects green light.
Why do plants produce O2?
because O2 is produced as a by-product when the plant creates H+ ions and free electrons from water
Where are the electrons used in photosystem II found at the very end of the light reactions?
The energy source in photosynthesis is:
visible light.
Suppose that you are experimenting with different types of lighting for your indoor green plants. Which of the following colors of light will be most effective?
Light reactions produce:
ATP, NADPH, and O2.
Where does the O2 released during photosynthesis come from?
During the process of photosynthesis, solar energy is converted to:
chemical energy.
The light reactions of photosynthesis result in which of the following?
synthesis of ATP
The energy of the movement of electrons down a concentration gradient via electron transport within chloroplasts and mitochondria is used to generate molecules of:
Suppose you are studying photosynthesis in a research lab. You grow your plants in a chamber with a source of water that has a radioactively labeled oxygen atom. What photosynthetic product will be radioactive?
O2 gas
The NADPH required for carbon dioxide fixation is formed:
during the light reactions.
The primary function of the light reactions of photosynthesis is to:
produce energy-rich ATP and NADPH.
Which of the following provides O2 as an end product?
light reaction
In plants, photosynthesis takes place in
ATP drives reactions that produce
Photosynthetic organisms are
Survival of nearly all organisms depends on
Pigments absorb
photon energy
Replacement electrons flow to
to pigments
In plants, light-dependent reactions take place in
the thylakoid membrane system

The light-independent reactions take place in
the stroma
The largest cytoskeletal element is the
Intermediate filaments composed of cytokeratins reinforce cells that make
nails, claws, horns, hair
Most of the action or function of cell membranes are conducted by
5. Which of the following is thought to be the descendant of engulfed ancient bacteria?
Cell walls are found in
plants, protists, fungi, bacteria
The movement of a substance toward an area of lower concentration is called
Transport across a cell's membrane that requires energy is called
active transport
The term "selective permeability" describes the characteristic of membranes that
permit some molecules to cross the membrane while preventing others from crossing
Communication proteins permit
signaling between adjacent cells
"Aerobic" implies use of
Air - O2 required
C6H12O6 + 6O2 ->
6CO2 + 6H2O
The basic raw materials need by plants for photosynthesis are
Water and carbon dioxide
The first event in photosynthesis is the
Excitation of an electron from chlorophyll
The end products of the light-dependent reactions of photosynthesis are
One outcome of the noncyclic pathway used by early autotrophs was the
Enrichment of the atmosphere with oxygen
Photosynthesis is what kind of reaction?
Does photosynthesis makes carbohydrate?
Yes, sugar
Where does the most photosynthesis take place?
In the waters of the earth

Deck Info