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Example Questions
Example Question #2 : Understand Functions Of Organelles In The Cell
Where would you be least likely to find a transmembrane protein?
Cell membrane
Ribosomes
Mitochondria
Nucleus
Chloroplasts
Ribosomes
The simple answer here is that all of these organelles have a membrane, except for ribosomes. Nuclei, mitochondria, chloroplasts, and cells as a whole have transmembrane proteins spanning the lipid bilayer, which can be used for transport or other purposes. Ribosomes are mostly comprised of rRNA and do not have membranes; thus, they will not bear transmembrane proteins.
Example Question #2 : Understand Functions Of Organelles In The Cell
The Golgi apparatus is responsible for which function of the cell?
Protein degradation
Protein packaging
Protein synthesis
Protein storage
Protein packaging
The Golgi apparatus is a series of flattened membrane sacs found in the cell. It receives vesicles filled with proteins from the rough endoplasmic reticulum. The Golgi apparatus is responsible for recognizing proteins based on their signal sequences and sending concentrations of similar proteins to various parts of the cell. It can also deliver proteins out of the cell using secretory vesicles. The membrane sacs of the Golgi apparatus are constantly used and regenerated to create vesicles of packaged proteins.
Example Question #2 : Understand Functions Of Organelles In The Cell
Which of the following structures/functions is not created using microtubules?
Muscle contraction
Eukaryotic flagella
Mitotic spindles
Cilia
Muscle contraction
Muscle contraction is accomplished using the function of microfilaments, namely actin and myosin. Microtubules are not a key player in muscle contraction, but are used to create the mitotic spindles, flagella, and cilia. Microtubules are a key element of the cytoskeleton, and are generally involved in structural aspects of the cell.
Example Question #3 : Understand Functions Of Organelles In The Cell
Ribosomes are the site of protein synthesis in both eukaryotes and prokaryotes. In eukaryotes, ribosomes can either be "free" or "bound." To which larger organelle are bound ribosomes attached?
Lysosomes
Rough endoplasmic reticulum
Golgi apparatus
Mitochondria
Smooth endoplasmic reticulum
Rough endoplasmic reticulum
While free ribosomes are present independently in the cytosol, bound ribosomes are attached to the rough endoplasmic reticulum. Their presence gives this organelle its "rough" appearance and distinguishes it from the smooth endoplasmic reticulum, which does not contain ribosomes. The nuclear envelope, which surrounds and protects the eukaryotic nucleus, is also the site of some bound ribosomes and is connect to the rough endoplasmic reticulum. The Golgi apparatus, lysosomes, and mitochondria have no ribosomes bound to their membranes.
Example Question #3 : Understand Functions Of Organelles In The Cell
Which of the following organelles directly requires oxygen to maintain optimal function?
Ribosomes
Smooth endoplasmic reticulum
Plasmids
Nucleolus
Mitochondria
Mitochondria
The mitochondria are membrane-bound organelles involved in the process of cellular respiration. Specifically, the Krebs cycle takes place in the matrix of the mitochondria and the electron transport chain takes place along the inner mitochondrial membrane. During aerobic respiration, oxygen is used as the final electron receptor of the electron transport chain and generates water as a byproduct. Without oxygen, the mitochondria cannot perform oxidative phosphorylation, and the cell must rely on glycolysis for energy.
Example Question #2 : Understand Functions Of Organelles In The Cell
Of the following organelles, which contains hydrolytic enzymes that can break down cellular debris?
Lysosome
Endoplasmic reticulum
Plasma membrane
Nucleus
Peroxisome
Lysosome
Lysosomes contain hydrolytic enzymes that can digest macromolecules from phagocytosis, endocytosis, and autophagy. When damage occurs to the membrane of the lysosome, these enzymes can be released and cause damage to the cell, leading to apoptosis.
Peroxisomes contain peroxidases, which help to eliminate hydrogen peroxide from the cell and prevent the creation of free radicals. The nucleus houses DNA and would be severely damaged by the introduction of hydrolytic enzymes. The plasma membrane is used to contain the cytoplasm and organelles and the endoplasmic reticulum is used to modify and package proteins.
Example Question #5 : Understand Functions Of Organelles In The Cell
A centriole is a cylindrical structure that is primarily involved in which process?
Cell division
Glycolysis
Lipid storage
Gluconeogenesis
Cellular respiration
Cell division
Centrioles are cell structures that are mainly composed of tubulin and are involved in the organization of the mitotic spindle and cytokinesis during cell division.
Cellular respiration primarily occurs on the inner mitochondrial membrane with the aid of membrane proteins. Glycolysis and gluconeogenesis occur in the cytoplasm and are facilitated by proteins. Lipids are mostly stored in bones and adipose tissue. These processes do not require intervention from the cytoskeleton or microtubules that compose the centrioles.
Example Question #3 : Understand Functions Of Organelles In The Cell
What cellular structure is composed of a protein skeleton that is made up of lamins?
Mitochondrion
Chloroplast
Lysosome
Nucleus
Peroxisome
Nucleus
Nuclear lamins are fibrous proteins (intermediate filaments) that provide the structural function and the transcriptional regulation in the nucleus of a cell. Note that lamins differ from laminins, which are a protein component of basement membranes.
Example Question #601 : Cellular Biology
What term describes the tendency of an organism to maintain a relatively stable equilibrium between interdependent elements in its internal environment?
Mitosis
Synthesis
Homeostasis
Respiration
Reproduction
Homeostasis
Homeostasis is the mechanism that allows for organisms to maintain equilibrium of their internal environments. Certain variables of the internal environments are regulated such that the conditions of the organism remain stable and relatively constant. This is often accomplished via negative feedback loops and hormone regulation.
Reproduction refers to an organism's ability to generate offspring. Respiration refers to the method of gas exchange in the lungs. Synthesis refers to the generation of certain molecules. Mitosis refers to cellular division. While any of these processes could be used to affect the equilibrium state of an organism, they are all mediated by homeostatic mechanisms in order to maintain biological stability.
Example Question #602 : Cellular Biology
Which of the following is true of mitochondria?
All of these are true statements
Mitochondria are involved in energy metabolism
Mitochondria are independent of the endomembrane system
Mitochondria have more than one membrane
Mitochondria contain DNA and ribosomes
All of these are true statements
Each of these answers correctly describes characteristics of mitochondria. Mitochondria are semi-autonomous: they are capable of synthesizing some of their own proteins with DNA and ribosomes. The proteins are then embedded in the inner mitochondrial membrane, and function in the electron transport chain. Mitochondria have two membranes, an inner membrane and an outer membrane. Mitochondria are the sites of cellular respiration and ATP production, often called the "powerhouse" of the cell. After glycolysis, pyruvate is transported to the mitochondrial matrix for the Krebs cycle and electron transport chain. Mitochondria are not involved in the endomembrane system; they are separate organelles.
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