what structure or organelle may be defective in such diseases?
536597
Researchers at UT Southwestern Medical Center have uncovered the mechanism that cells use to find and destroy an organelle called mitochondria that, when damaged, may lead to genetic problems, cancer, neurodegenerative diseases, inflammatory disease, and aging.
1215224
Both chloroplasts and mitochondria lack genetic information in the form of DNA. Unlike chloroplasts, mitochondria are surrounded by a double membrane. Nearly all of the mitochondria in your cells were inherited from your mother.
601106
A single gene defect usually does not cause the chromosome structure or number to be abnormal. Similarly, a person can have normal genes, but, because they have extra copies of genes due to a chromosome abnormality, the extra copies can cause the genes to not work properly. This is an important distinction to make.
1043069
The roles of the organelles within the cells need to be introduced and relate structure and location of organelles to their function. Cells differ in size, shape and structure and therefore carry out specialised functions.
648486
This is generally what we mean when we use the term organelle, which is a cellular structure, enclosed in a lipid membrane, that has a specialized function within a cell. Bacteria do not have membrane-bound organelles, but they do have many other cellular structures that aid with their life processes.
36548
Prokaryotes lack a defined nucleus (which is where DNA and RNA are stored in eukaryotic cells), mitochondria, ER, golgi apparatus, and so on. In addition to the lack of organelles, prokaryotic cells also lack a cytoskeleton.
939674
All eukaryotes have a Golgi apparatus though not all have the other organelles named above. They all have it because of it's indispensable function, transportation of lipids and the preparation for secretion an secretion of proteins.
280941
Heart defects are the most common type of structural defect. Others include spina bifida, cleft palate, clubfoot, and congenital dislocated hip. When there is a problem with a baby's body chemistry, it is called a metabolic birth defect.
1059698
Without membrane: Some cell organelles like ribosomes are not bounded by any membrane. They are present in prokaryotic as well as eukaryotic organisms. Single membrane-bound: Some organelles are bounded by a single membrane. For example, vacuole, lysosome, Golgi Apparatus, Endoplasmic Reticulum etc.
456232
These are cells which lose their nucleus, ribosomes, and vacuoles at maturity. They of course have cytoplasm, and it is connected by channels to companion cells (which do have these organelles). The sieve tube elements retain mitochondria and plastids.
958224
In addition to the nucleus, eukaryotic cells may contain several other types of organelles, which may include mitochondria, chloroplasts, the endoplasmic reticulum, the Golgi apparatus, and lysosomes.
129961
Eukaryotic cells contain a membrane-bound nucleus and numerous membrane-enclosed organelles (e.g., mitochondria, lysosomes, Golgi apparatus) not found in prokaryotes. Animals, plants, fungi, and protists are all eukaryotes.
1404073
an organelle is a specialized subunit within a cell that has a specific function. Individual organelles are usually separately enclosed within their own lipid bilayers. ... To answer our question, the cell wall can be considered an organelle as it is a subunit with a defined (set of related) function(s).
1076481
no membrane bound organelles- but there are numerous inclusions and granules. Numerous small ribosomes in cytoplasm. many membrane bound organelles- lysosomes, mitochondria (with small ribosomes), golgi bodies, endoplasmic reticulum, nucleus. ... Bacteria, of course, have no nucleus and therefore also nuclear membrane.
695398
The basic structure of cell consist of nucleus, plasma membrane and cytoplasm. Other than this different structures like Endoplasmic Reticulum(ER), Golgi body, Lysosomes, Mitochondria, Plastids and Vacuoles are also present. All of these are cell organelles.
3484
Mitochondria and chloroplasts are called semi-autonomous organelles because they have their own DNA, enzymes and transport systems.
400750
While all eukaryotic cells contain the aforementioned organelles and structures, there are some striking differences between animal and plant cells. Animal cells have a centrosome and lysosomes, whereas plant cells do not.