Unit 2 Flashcards
4 fundamental components of a cell
- cell membrane / plasma
- chromosomes (nucleic acids)
- ribosomes
- cytoplasm
what does the nucleus do?
stores genetic information
plasma membrane?
consists of a phospholipid bilayer and may contain cholesterol in humans
ribosomes?
used to make proteins
mitochondria?
used in the formation of ATP
lysosome?
contains digestive enzymes, and plays a role in phagocytosis
Replication of DNA enzyme:
DNA polymerase
Transcription - mRNA synthesized using DNA as a template, enzyme:
DNA-dependent RNA polymerase
translation - proteins are synthesized using mRNA as template, requires:
ribosomes
size comparison b/w euk & pro
euk - larger
pro - smaller
DNA - genome location
euk - nucleus & DNA packaged using histones
pro - nucleoid (not surrounded by membrane)
DNA - # of chromosomes
euk - multiple
pro - one
DNA - # of copies of each gene
euk - diploid
pro - haploid
DNA - shape of chromosomes
euk - linear
pro - circular
DNA - plasmids = extrachromosomal DNA that does not carry essential genes
euk - absent
pro - present
Cell division
euk - mitosis
pro - binary fission
genetic variation
euk - meiosis
pro - horizontal gene transfer
types of horizontal gene transfer:
- transformation
- transduction
- conjugation
- take up DNA from environment
- bacteriophage (virus attacks bacteria) transfers DNA from one bacterium to another
- one bacterium directly transfers DNA to another using a pilus
membrane-bound organelles
euk - present
pro - absent