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Example Question #1 : Cell Biology
What organelle is considered to be the "powerhouse of the cell," due to it's role in production of ATP?
Mitochondria
The nucleus
The rough endoplasmic reticulum
The Golgi apparatus
Mitochondria
Mitochondria are often called "the powerhouse of the cell" because they produce ATP, the body's most basic unit of energy. The nucleus houses the cell's DNA, the rough endoplasmic reticulum is the site of cellular protein manufacturing, and the Golgi apparatus packages protein manufactured in the cell for release and transport to the rest of the body.
Example Question #1 : Cell Biology
Which of the following is not a function of the cell membrane?
Attaches to the extracellular matrix and other cells to create tissues
Synthesize proteins
Regulates passage of substances into and out of the cell
Anchors the cytoskeleton to hold the shape of the cell
Synthesize proteins
The cell membrane has many purposes. It anchors the cytoskeleton to give the cell shape and structure. It houses proteins that both interact with signaling molecules from outside the cell and communicate with secondary messengers within the cell. It facilitates the absorption and release of electrolytes, water, and vesicles carrying proteins or other molecules. It forms junctions with other cells and connects the cell to the extracellular matrix.
One thing the cell membrane does not do, however, is act as a site of protein synthesis. That occurs primarily in the rough endoplasmic reticulum or on ribosomes in the cytoplasm.
Example Question #114 : General Biology
Which organelle is responsible for synthesis of lipids within the cell?
The smooth endoplasmic reticulum (ER)
The mitochondria
The Golgi apparatus
The nucleus
The smooth endoplasmic reticulum (ER)
The majority of lipid production within the cell occurs within the smooth endoplasmic reticulum. It is also the site of production of steroids and phospholipids. The Golgi apparatus is responsible for packaging of cell products for transport outside of the cell. The mitochondria produce ATP, and the nucleus houses the DNA.
Example Question #1 : Cell Biology
Which of the following organelles is responsible for cellular respiration?
The mitochondria
The peroxisomes
The centrioles
The ribosomes
The mitochondria
Aerobic cellular respiration occurs exclusively in the mitochondria. These organelles are present in greater number in cells that require a large supply of ATP, such as striated muscle cells, liver cells, and sperm cells.
Example Question #1 : Cell Biology
The __________ makes up the structural framework of the cell.
Cytoplasm
Rough endoplasmic reticulum
Nucleolus
Cytoskeleton
Cytoskeleton
The framework of the cell is make up by the cytoskeleton. The cytoskeleton gives the cell both shape and structure, and allows the cell to attach to extracellular connective tissue in order to form tissue types. There are three major fibers that make up cytoskeleton - microfilaments (actin), intermediate filaments, and microtubules.
Example Question #116 : General Biology
What role does cholesterol play in the cell membrane?
Fluidity and stabilization of phospholipids
Detoxification
Energy production
Production of steroids
Fluidity and stabilization of phospholipids
Cholesterol is a vital component of the cellular membrane. It maintains both the fluidity and structural integrity of the cell. While cholesterol is an integral component of steroid production, this occurs outside of the cell membrane. Cholesterol does not play a significant role in cellular energy production or cell membrane detoxification.
Example Question #121 : General Biology
All of the cells of the human body except sex cells and undifferentiated stem cells are termed __________ cells.
Gamete
Eukaryotic
Chromatic
Somatic
Somatic
All of the cells of the human body except sex cells are termed somatic cells. These are diploid cells, meaning that they contain two homologous copies of each chromosome. Sex cells (eggs and sperm) are haploid cells, containing just one set of chromosomes in each cell. All human cells are eukaryotic, because they contain a nucleus and organelles within a cellular membrane.
Example Question #122 : General Biology
Which of the following organelles is responsible for protein synthesis?
Ribosomes
Lysosomes
The nucleus
The smooth endoplasmic reticulum
Ribosomes
While the nucleus houses the DNA and plays an integral role in the transcription of genetic code in order to produce specific proteins, actual protein synthesis is carried out by the ribosomes. These organelles consist of two subunits and are either independent in the cytoplasm of the cell or housed in the rough endoplasmic reticulum. Note that ribosomes can be in the cytoplasm or on the endoplasmic reticulum, hence making it rough.
Example Question #123 : General Biology
A hypertonic IV would cause some amount of __________ of red blood cells as water moved out of the cell across the osmotic gradient.
A hypertonic IV would not affect blood cells
Saturation
Crenation
Lysing
Crenation
A hypertonic solution, or one which contains solutes in higher concentration than blood cells, would cause water to leave the red blood cell across the osmotic gradient. This causes a reversible crumpling or shriveling of the cell, termed crenation. A cell in a hypotonic solution, wherein the cell itself contained a higher level of solutes than the fluid, would take on water, potentially causing the cell to lyse (burst).
Example Question #124 : General Biology
Ribosomal subunits are manufactured by what organelle?
Nucleolus
Rough endoplasmic reticulum (RER)
Smooth endoplasmic reticulum (SER)
Nucleus
Nucleolus
Ribosomal subunits are manufactured by the nucleolus, which is contained within the nucleus. It's primary function is the production and assembly of ribosome subunits. The RER houses ribosomes for protein manufacture. The SER does not take part in ribosome production or functioning. Note that ribosomes are composed of rRNA and protein. Proteins are translated on ribosomes in the cytoplasm.
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