| Question Answer | The molecules that make the cell surface fuzzy, sticky, and sugar-rich are the: glycoproteins | Protein synthesis occurs on the Golgi apparatus in the cell. False | The greater the osmotic pressure, the greater the tendency of water to move into that area. True |
|---|
What are the molecules on the surface of cells?
With few exceptions, cellular membranes — including plasma membranes and internal membranes — are made of glycerophospholipids, molecules composed of
glycerol, a phosphate group, and two fatty acid chains
. Glycerol is a three-carbon molecule that functions as the backbone of these membrane lipids.
What membrane connections prevent leaking fluid between cells?
| The network of nuclear threads, composed of DNA and protein, that condense to form chromosomes during mitosis is called __________. chromatin | The membrane connections that prevent the leaking of fluid between cells are called __________. tight junctions |
|---|
What are cells that are specialized to fight disease called?
White blood cells
, also called leukocytes (LOO-kuh-sytes), play an important role in the immune system. Some types of white blood cells, called phagocytes (FAH-guh-sytes), chew up invading organisms. Others, called lymphocytes (LIM-fuh-sytes), help the body remember the invaders and destroy them.
What makes the cell surface sticky?
Cells’ stickiness comes from
proteins that sit on their surface
, often spanning each cell’s surrounding membrane like a sea monster loops in and out of the water. These proteins can make contact with similar proteins on other cells, holding together and keeping our bodies and organs in the right shape, and place.
What are sticky cells?
Cell “stickiness” could
indicate the likelihood that cancer will spread to other parts of the body
. University of California researchers found tumour cells that stuck less to surrounding cells are more likely to migrate and invade other tissue.
What is in between cells?
A nonliving material, called
the intercellular matrix
, fills the spaces between the cells. This may be abundant in some tissues and minimal in others. The intercellular matrix may contain special substances such as salts and fibers that are unique to a specific tissue and gives that tissue distinctive characteristics.
What type of cell is a bacteria?
Prokaryotic cells
(i.e., Bacteria and Archaea) are fundamentally different from the eukaryotic cells that constitute other forms of life. Prokaryotic cells are defined by a much simpler design than is found in eukaryotic cells.
Can salt pass through cell membrane?
The salt ions can not pass through the membrane
. The net flow of solvent molecules through a semipermeable membrane from a pure solvent (in this cause deionized water) to a more concentrated solution is called osmosis.
How many molecules are in a human cell?
Ho’s analysis reveals for the first time how many molecules of each protein there are in the cell, with a total number of molecules estimated to be
around 42 million
. The majority of proteins exist within a narrow range — between 1000 and 10,000 molecules.
What is the fuzzy sticky sugar rich area on a cell’s surface called?
| Question Answer | The molecules that make the cell surface fuzzy, sticky, and sugar-rich are the: glycoproteins | Protein synthesis occurs on the Golgi apparatus in the cell. False | The greater the osmotic pressure, the greater the tendency of water to move into that area. True |
|---|
What are the intercellular junctions between plant cells?
Plasmodesmata
are intercellular junctions between plant cells that enable the transportation of materials between cells. A tight junction is a watertight seal between two adjacent animal cells, which prevents materials from leaking out of cells.
What are the three types of cell junctions?
Many cells in tissues are linked to one another and to the extracellular matrix at specialized contact sites called cell junctions. Cell junctions fall into three functional classes:
occluding junctions, anchoring junctions, and communicating junctions
.
Which organ produces immune cells?
Bone marrow
is a sponge-like tissue found inside the bones. That is where most immune system cells are produced and then also multiply. These cells move to other organs and tissues through the blood. At birth, many bones contain red bone marrow, which actively creates immune system cells.
What helps the body fight disease?
In general, your body fights disease by keeping things out of your body that are foreign. Your primary defense against pathogenic germs are
physical barriers like your skin
. You also produce pathogen-destroying chemicals, like lysozyme, found on parts of your body without skin, including your tears and mucus membranes.
What are the two types of immune responses?
Although all components of the immune system interact with each other, it is typical to consider two broad categories of immune responses:
the innate immune system and the adaptive immune system
.
