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BIO 100 > exam 2 > Flashcards

exam 2 Flashcards

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Biology 101 flashcards
1
Q

stem cells

A
  • self renewal (divide/renew for a long time)
  • differentiation (unspecialized, can give rise to specialized cells)
  • found in embryos and some places in adults (long bones)
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2
Q

other dividing cells

A

liver cells will only divide into more liver cells

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3
Q

permanently differentiated cell

A

some cells normally do not divide (dormant)
ex. brain and cardiac muscle

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4
Q

binary fission (prokaryotic cell replication)

A
  1. chromosome attached to cell membrane
  2. DNA in single, circular chromosome replicates
  3. two chromosomes separate and move apart
  4. new membrane added
  5. cleavage in between
  6. two new daughter cells
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5
Q

differences between eukaryotic and prokaryotic chromosomes

A
  • bound in membraned nucleus
  • linear instead of circular
  • contain much more proteins and different proteins
  • contain far more DNA
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6
Q

structure of eukaryotic chromosome

A
  • DNA is would up tightly around histone proteins
  • other proteins coil up DNA/histone beads like a slinky
  • coils are attached in loops to protein scaffolding to complete chromosome packaging
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7
Q

telomere

A

protective caps at each end of chromosome, keeps them located in replication

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8
Q

centromere

A

holds two daughter DNA double helices together after replication and attaches to spindle during cell division

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9
Q

growth factors

A

molecules that bind to receptors on target cells to enhance their rate of cell division/differentiation

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10
Q

check points in cell replication

A
  1. g1 to s: is the cell’s DNA intanct and suitable for replication?
  2. g2 to mitosis: has the DNA been completely and accurately replicated?
  3. metaphase to anaphase: are all the chromosomes attached to the spindle and aligned properly at the equator of the cell?
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11
Q

chromosome replication

A
  • single chromosome
  • duplicated chromosome (made of two sister chromatids, identical replicated DNA, attached at centromere)
  • independent chromosomes (sister chromatids are separated, independent daughter chromosomes)
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12
Q

homologues

A
  • chromosome pairs, contain the same genes (not necessarily the same DNA/alleles)
  • one from each parent
  • humans have 23 homologues (46 chromosomes total)
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13
Q

diploid vs. haploid

A
  • somatic cells that have pairs of homologous chromosomes (2n)
  • gametes have 1 chromosome in each homologous pair (1n)
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14
Q

mitosis interphase

A

acquires nutrients, grows and differentiates, prepares for division
- G1: growth and differentiation
- S: DNA synthesis
- G2: growth and division prep

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15
Q

mitosis prophase

A

chromosomes condense, spindle forms, nucleolus disappears; nuclear membrane dissolves, kinetochore holds chromosomes to spindle

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16
Q

mitosis metaphase

A

kinetochores attached to centromeres line up on equator

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17
Q

mitosis anaphase

A

sister chromatids separate and move to poles

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18
Q

mitosis telophase

A

chromosomes decondense, nuclear envelope reforms around 2 new nuclei, spindle disappears

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19
Q

cytokinesis

A

the rest of the cell separates, 2 identical daughter cells are formed

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20
Q

chromosome replication before meiosis

A

each homologue is replicated (one homologous pair: 2 duplicated chromosomes –> 4n)

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21
Q

meiosis prophase I

A

duplicated chromosomes condense, homologues pair up and cross over (DIVERSITY!!!), nuclear envelope disappears, spindle forms

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22
Q

meiosis metaphase I

A

paired homologues line up on equator, kinetochores attach to spindle

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23
Q

meiosis anaphase I

A

homologue pairs separate, move to opposite poles, one duplicated chromosome (2 sister chromatids + centromere) to each side

24
Q

meiosis telophase I

A

spindle disappears, cytokinesis follows, two 2n cells are formed

25
Q

meiosis prophase II

A

chromosomes recondense, nuclear envelope disappears (if it re-formed), spindle reforms and attaches to sister chromatids

26
Q

meiosis metaphase II

A

chromosomes line up on equator, attached to spindle by kinetochore

27
Q

meiosis anaphase II

A

duplicated sister chromatids separate, move to opposite poles

28
Q

meiosis telophase II

A

nuclear envelope reforms, chromosomes decondense, microfilaments contract, spindle dissolves, cytokinesis.
- 4 haploid (1n) gametes are formed
- 1 member of each pair of homologues, each is unique

29
Q

true breeding

A

some trait that is inherited unchanged by all offspring of self-fertilization

30
Q

law of segregation

A

pairs of alleles on homologous chromosomes separate during meiosis

31
Q

law of independent assortment

A

genes (alleles) are inherited independently of each other
- UNLESS the genes are on the same chromosomes, they’re most likely inherited together (linked genes)
- cross over can unlink linked genes

32
Q

dominant disorders

A
  • heterozygotes have a minor form of the condition, carriers
  • homozogotes have the condition in more severe form
33
Q

recessive disorders

A
  • heterozygotes are carriers but don’t show the condition
  • homozygotes express the condition
34
Q

sex-linked conditions

A
  • gene is carried on the sex chromosomes, much more likely on the X than the Y
  • not expressed by female unless it’s carried on BOTH of her X chromosomes (carrier)
  • expressed by male because his Y doesn’t cover up the affected X chromosome
35
Q

different strategies for meiosis

A

protists, algae, fungi: asexual
- fuse two 1n cells for meiosis, then stay at 1n

animals: sexual
- live as 2n, meiosis makes 1n gametes which fuse and become new 2n organism

plants: alternation of generations
- live as 1n spore, fuse to become 2n and grow until you make 1n spores again

36
Q

structure of DNA

A

4 nucleotides each made of phosphate group, deoxyribose sugar, and nitrogen base (A, T, G, or C)
- rails of the ladder are phosphates and sugars (one end 5 prime and the other 3 prime)
- rungs are nitrogenous bases held together with hydrogen bonds (A = T, G = C)

37
Q

genome

A

the complete set of genetic information in an organism (depends on the SEQUENCE of the nucleotides)

38
Q

DNA helicase

A

breaks the H bonds holding nitrogen bases together, unzips the two strands of DNA

39
Q

DNA polymerase

A

pair up the exposed bases with complimentary free nucleotides

40
Q

DNA ligase

A

stitch okazaki fragments together from the lagging strand

41
Q

leading strand

A

creates 5’ to 3’ strand on the parent strand being read from 3’ to 5’, replicated continuously toward the replication fork

42
Q

lagging strand

A

creates 5’ to 3’ strand on the 3’ 5’ parent strand, working away from the replication fork, created in okazaki fragments (which are bound together by DNA ligase)

43
Q

point mutation

A

single nucleotide base is incorrect or incorrectly changed

44
Q

substitutions

A

repair enzymes replace with the wrong base

45
Q

insertion

A

extra base(s) added to the strand

46
Q

deletion

A

deletion base(s) incorrectly taken out of the strand

47
Q

frame shift

A

when insertion or deletion mutations cause the codons (which are read in the 3s) to be read differently

48
Q

inversion

A

piece(s) of DNA taken out, turned around, and re-inserted

49
Q

translocation

A

whole globs of DNA are taken off one chromosome and attached to another
- common between 8/22, 8/11, and trisomy 21

50
Q

beadle & tatum

A

“one gene, one enzyme”
- but not all proteins are enzymes
- actually: one gene one protein

51
Q

transcription vs. translation

A
  • DNA –> mRNA (same language) vs. mRNA –> tRNA –> amino acids (different langauge)
  • occurs in the nucleus vs. the cytoplasm
52
Q

types of RNA

A
  • mRNA: code for amino acid sequence of protein, travels from nucleus to cytoplasm
  • rRNA: makes up ribosomes
  • tRNA: transfers amino acids to ribosome, anticodon to attach to mRNA on one end, amino acid on the other (attached to other amino acids using ATP)
53
Q

stages of transcription

A
  • initiation: RNA polymerase binds to beginning of gene (promotor), DNA unwinds
  • elongation: polymerase moves down DNA template strand from 3’ to 5’ and builds complementary mRNA strand (5’ to 3’)
  • termination: DNA end signal, mRNA is released, DNA rewinds
54
Q

stages of translation

A
  • initiation: start tRNA binds to start mRNA, large and small ribosomal subunits bind together
  • elongation: each codon paired with anticodon, bond btwn amino and tRNA breaks, bonds btwn amino acids form
  • termination: stop codon is reached, mRNA and chain released, ribosomal subunits separate
55
Q

mRNA modification

A
  • more RNA nucleotides form cap and tail (prevent degradation in cytoplasm)
  • splicing: introns (non coding regions) are cut out
  • exons (coding regions) are pasted together
56
Q

why splice?

A
  • many possible splicing arrangements = many possible proteins from a single gene
  • introns can be the source of evolution of proteins
  • exons will change places during splicing –> new proteins can be harmful, helpful, or neutral
57
Q

direction of transcription

A

5’ to 3’ direction

BIO 100 (4 decks)

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