Which of the following is true?
Ribosomes may be found scattered in the cytoplasm or attached to the rough endoplasmic reticulum and are involved in protein synthesis
Which of the following organelles has the function of STORAGE, ALTERATION, and PACKAGING of secretory products and lysosomal enzymes?
Which of the following terms is NOT used to define the structure that separates the contents of a human cell from its surrounding medium?
Which of the following consists of a network of intracellular membranes with attached ribosomes?
Rough Endoplasmic Reticulum
Which form of endoplasmic reticulum modifies and packages newly synthesized protein?
Rough Endoplasmic Reticulum
Match the organelles (1-4) with the correct description (5-8)
3. Endoplasmic Reticulum
5. Intracellular transport
6. liquid in cell
7. Manufactures cell energy
8. Separates chromosomes during mitosis
1&7, 2&8, 3&5, 4&6
Each of the following is a function of smooth endoplasmic reticulum, except?
Modification of protein
The following is a list of the steps involved in the process of secretion by the Golgi apparatus. Put them in the order that they occur.
1. Material moves from cistern to cisterna by means of transfer vesicles.
3. Products from RER are packaged into transport vesicles.
4. Secretory vesicles are formed at the maturing face.
5. Vesicles arrive at the forming face.
6. Enzymes modify arriving proteins and glycoproteins.
3, 5, 6, 1, 4, 2
Some cells contain large numbers of mitochondria while others have relatively few or none. This suggests that?
cells with large numbers of mitochondria have a high energy demand.
Receptor Molecules on the surface of cells bind specific molecules called, in general, _______?
The functional units of DNA that contain the instructions for making one or more proteins are?
In cells that are not dividing, chromosomes uncoil to form a tangle of fine fibers known as____________?
________ refers to identifying an individual on the basis of repetitive nucleotide sequences in his or her DNA.
The molecule that brings the proper amino acid into place at the ribosome for the elongation of a new protein is called?
Put the following steps of protein synthesis in correct order of occurrence.
1. mRNA is produced in nucleus
2. ribosome moves along mRNA
3. DNA uncoils for transcription
4. Polypeptide is produced
5. tRNA brings amino acids to ribosome
6. mRNA moves to the ribosome.
3, 1, 6, 2, 5, 4
The duplication of DNA is called _______, The copying of DNA to mRNA is called _______, And the reading of the mRNA by the cell to make a protein is called __________.
Replication, Transcription, Translation
A gene is a set of specific instructions that?
Indicates the sequence of amino acids in a protein molecule.
The movement of oxygen from an area of high concentration to an area of low concentration is an example of?
The skin swells and puckers during a long bath. This suggests that bath water is a(n) ______ fluid.
The process by which molecules such as glucose are moved into cells along their concentration gradient with the help of membrane-bound carrier protein is called?
Facilitated diffusion differs from ordinary diffusion in that?
The rate of molecular movement is limited by the number of available carrier molecules
All of the following membrane transport mechanisms are passive processes, except?
A process that requires cellular energy to move a substance against its concentration gradient is called?
In order to maintain cellular homeostasis, an exchange pump ejects ______ ions from the cell and imports _____ ions.
Whenever positive and negative ions have been separated, a(n) ______ will be produced.
The stage in a cells life in which the cell performs its normal functions and prepares for division is called?
During this phase of cell division, the chromosomes uncoil, the nuclear membrane forms, and cytokinesis occurs.
During Mitosis, two daughter cells form each of which has
the same number of chromosomes as the original cell.
The correct order of phases in cell division is?
Interphase, Prophase, Metaphase, Anaphase, Telophase
If a cell has 18 chromosomes and undergoes mitosis how many chromosomes would each daughter cell have?
________ cells are all of the cells of the body except the reproductive cells (sperm and oocytes)
The ______ typically consists of five or six flattened membranous discs called cisternae.
what do cells do?
-Respond to the environment
-Maintain homeostasis at the cellular level
-Modify structure and function over time
Functions of the cell membrane
regulates exchange with environment:
-Ions and nutrients enter
-waste and cellular products released
Monitors the environment:
-Extracellular fluid composition
-Anchors calls and tissues
Phospholipid Bilayer contains
Hydrophilic heads- toward watery environment, both sides
Hydrophobic fatty-acid tails- Inside membrane
-Barrier to ions and water soluble compounds
- Bind the cell membrane to other structures
cytoskeleton inside the cell
Other cells outside the cell
-Receptive to extracellular molecules called ligands (ions, hormones)
-An example is the binding of insulin to cells and the subsequent absorption of glucose into the cell
- Receptor proteins are VERY specific
Membrane Carbohydrates include
Proteoglycans, Glycoproteins, and Glycolipids:
-extend outside cell membrane
-Form sticky "sugar coat" (Glycocalyx)