GED Science : Other Cell Concepts
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Example Question #1 : Other Cell Concepts
During what portion of the cell cycle does the replication of DNA take place?
S phase
G2 phase
M phase
G1 phase
S phase
There are two fundamental sections of the cell cycle: mitosis and interphase. The M phase denotes mitosis, during which the cell divides. Interphase is composed of several subsections during which the cell grows, organelles replicate, and the cell prepares for division.
Interphase can be divided into the subsections G1, S, and G2. While G1 and G2 are dedicated to the growth of the cell and organelle replication, the S phase is when cellular DNA is replicated.
Example Question #41 : Cells And Life
Which of the following membrane transport mechanisms is not an active processes?
Diffusion
Pinocytosis
Active transport
Endocytosis
Phagocytosis
Diffusion
Passive transport processes move ions or molecules across the plasmalemma without any energy expenditure by the cell whereas active transport processes involve the cell spending energy.
During diffusion a molecule moves from an area of high concentration to an area of low concentration. Movement is achieved following the concentration gradient and no energy is spent by cell.
Example Question #42 : Cells And Life
Which of these cell transportation processes is the most selective?
Osmosis
Diffusion
Receptor-mediated endocytosis
Endocytosis
Pinocytosis
Receptor-mediated endocytosis
Receptor-mediated endocytosis is a process that resembles pinocytosis but is far more selective and only allows the entry of specific molecules into the cell. Target substances are bound to receptors on the membrane surface and brought into the cell via coated vesicles.
Example Question #45 : Cells And Life
Which of the following is not one of the three cell theory concepts?
Cells are the smallest structural units that perform all vital functions
Cells must have a nucleus
Cells are the structural "building blocks" of all plants and animals
None of these are concepts of the cell theory
Cells are produced by the division of preexisting cells
Cells must have a nucleus
A cell does not have to have a nucleus. Prokaryotic cells are characterized by the fact that they don't have a nucleus nor any other membrane-bound organelles. However the rest of the statements are true of all cells and comprise cell theory.
Example Question #46 : Cells And Life
Bacteria are examples of prokaryotic cells.
Which of the following cell structures are found in prokaryotic cells?
Nucleus, cytoplasm, ribosomes, cell membranes, and cell walls
Ribosomes, chromosomes, cytoplasm, cell membranes, and cell walls
Nucleus, mitochondria, chromosomes, vacuoles, and flagella
Chromosomes, lysosomes, cell walls, cilia, and endoplasmic reticulum
Ribosomes, nucleus, cytoplasm, cell membranes, and flagella
Ribosomes, chromosomes, cytoplasm, cell membranes, and cell walls
Bacterial cells have cell membranes, cell walls, chromosomes, cytoplasm, and ribosomes. They may have flagella or cilia as well. They do not contain any membrane-bound organelles, such as the nucleus, endoplasmic reticulum, or mitochondria.
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