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36 Cards in this Set

  • Front
  • Back
What are the three principal parts of the cell?
Plasa Membrane
What is the term for programmed cell death?
What is the term for cell death resulting for tissue injury?
The fluid portion of the cytoplasm is the?
What are the 3 causes of cellular aging?
Free radicals formation
Cross-link formation between glucose & proteins
Shortening and loss of protective telomeres on chromosomes
Duplicated chromosomes held together by centromeres are called chromatids.
The sodium pump is an example of promary active transport?
The basic structural unit of the plasma membrane is the?
Lipid bilayer
Integral proteins can function in the cell membrane in all the following ways
Cell-identity marker
Integral proteins can function in the cell membrane as an exocytosis vesicle. T/F
What 5 factors influence the diffusion rate of substances through a plasma membrane?
Concentration gradient
Diffusion distance
Surface area
Size of diffusions substance
A cell would lose water volume and shrink if placed in a hypertonic solution. T/F
Define Hypertonic
Solution that causes cells to shrink due to loss of water by osmosis
Nucleoli within the nucleus are the sites of ribosome synthesis
Most of the cell's hereditary units, called genes, are located within the nucleus
In nondividing cells, DNA is found in the nucleus in the form of chromatin
Define Mitosis
Somatic cell division resulting in identical daughter cells
Define Meiosis
Reproductive cell division that reduces the number of chromosomes by half
Define Prophase
Stage when chromatin fibers condense and shorten to form chromosomes
Define Metaphase
Stage when centromeres of chromatid pairs line up at the center of the mitotic spindle
Define Anaphase
Stage when centromeres split and sister chromatids move to opposite poles of the cell
Define Telophase
Stage when chromosomes uncoil and revert to chromatin
Define Cytokinesis
Cytoplasmic division
Define Interphase
Stage of cell division when replication of DNA occurs
Define Codon
A transcribed sequence of three RNA nucleotides
Define RNA polymerase
enzyme that catalizes transcription of DNA
Define Intron
DNA region that does not code for synthesis of a part of a protein
Define Exon
DNA region that codes for synthesis of a part of a protein
Define Transcription
The copying of the DNA message onto messenger RNA
Define translation
Reading of messenger RNA for protein synthesis
Define messenger RNA
Directs synthesis of a protein
Define Transfer RNA
Binds to amino acids and holds them in place on a ribosome to be incorporated into a protein
Define Ribosomal RNA
Joins with ribosomal proteins to make ribosomes
Define snRNP
Enzyme that removes all introns and joins remaining exons
Define Promotor
Nucleotide sequence, located near the beginning of a gene, that indicates where transcription begins; RNA polymerase attachment site
Define Terminator
Nucleotide sequence near the end of a gene that indicates where transcription ends; releases RNA polymerase