Chapter 2 Flashcards
Cytosol
colloidal material which surrounds cellular organelles
Cytoskeleton
made of microtubules and microfilaments, used for support
Smooth E.R.
site of lipid synthesis
Rough E.R.
site of protein synthesis
Mitochondria
site of ATP synthesis and cell respiration
Chloroplasts
site of photosynthesis
Centrioles
organize spindle fibers, located in centrosome
Spindle Fibers
composed of microtubules, moves chromosomes
Metacentric
centromere at middle
Submetacentric
centromere between middle and end
Acrocentric
centromere close to end
Telocentric
centromere at end
Karyokinesis
genetic material divided into two daughter cells during nuclear division
Cytokinesis
cytoplasmic division
Cell Cycle
continuous alternation between division and non division of cells
Interphase
longest part of cell cycle where cell grows and DNA replication occurs
Prophase
chromosomes condense, centrioles move to cell ends, and nucleolus disintegrates
Sister Chromatids
two parts of each chromosome connected by centromere
Prometaphase
chromosomes move towards middle
Metaphase
chromosomes line up at metaphase plate
Cohesin
holds sister chromatids together
Separase
degrade cohesion
Shugoshin
prevents degradation of cohesion
Anaphase
sister chromatids separate (disjunction) and move to poles
Telophase
cytokinesis divides, chromosomes become chromatin again
Kinases
enzyme products of mutated genes
Cyclins
proteins that bind with kinases and activate them at appropriate times
Crossing over
occurs in prophase I, increases genetic variation
Synapsis
pairing of homologous chromosomes in prophase I
Bivalent
each synapsed pair of homologs
Terminal Chiasmata
hold non sister chromatids together
Meiosis I
reductional division
Meiosis II
equational division
Spermatogenesis
spermatogonium cell to primary spermatocyte, meiotic division to two secondary spermatocyte, then to 4 spermatids
Oogenesis
oogonium cell to primary oocyte, meiotic division to polar body and primary oocyte, then ootid and second polar body ( one egg )