Biol 207 Midterm 1 Questions And Answers 100%
Correct Answers
Which stage does DNA replication occur? ANS S phase
What are the 3 cohesin proteins? ANS Smc3, Smc1, Scc1
What do protected cohesins hold together? ANS sister chromatids
When are cohesin rings broken? ANS before anaphase
how many chromosomes are in an embryo to adult stage? ANS 2n=46
how much DNA is in a 2n organism at G1, S, G2, M? ANS 2c, 4c, 4c, 2c
what do unprotected cohesins hold together? ANS homologous chromosomes
Do protected or unportected cohesins get broken during anaphase 1? ANS unprotected
anaphase 2 breaks which cohesins? ANS protected
spermatogenesis and oogenesis are what type of process? ANS gametogenesis
Oogenesis: what are the end products? ANS one large haploid cell and polar bodies
Process of oogenesis? ANS 1) meiosis in fetus
2) pause in prophase 1
3) puberty - once a month cells resume meiosis, enter oviduct, can be fertilized
dizygotic twins occur how? ANS fraternal twins - 2 zygotes, 2 blastocysts
, two ways monozygotic twins occur? (least common) ANS 1 zygote splits at the two cell stage, 2
blastocysts OR 1 blastocyst splits into two -- same membrane for pregnancy
Corn produces ... ANS pollen and eggs
yeast produces... ANS a/alpha cells that produce a and alpha cells through meiosis
cell fusion ANS haploid yeast cells do this to make diploid cells (a/alpha cells)
what process makes one multicellular organism or many unicellular organisms ANS mitosis
can alpha fuse with alpha cells ANS no. alpha can only fuse with a
meisosis of a/alpha cell produces... ANS two a and two alpha cells
yeast uses what mechanism during mitosis ANS budding
nucleic acid rules? (5) ANS 1) made using triphosphate nucleotides
2) made 5' to 3'
3) made using ssDNA template
4) pair antiparallel
5) pair with complimentary base pairing
prokaryotic DNA and organelle DNA is ... ANS circular
eukaryotic DNA is ... ANS linear
DNA pols cannot reach the ends of DNA. What is the solution? (2 parts) ANS 1) telomere DNA
(sacrificial)
Correct Answers
Which stage does DNA replication occur? ANS S phase
What are the 3 cohesin proteins? ANS Smc3, Smc1, Scc1
What do protected cohesins hold together? ANS sister chromatids
When are cohesin rings broken? ANS before anaphase
how many chromosomes are in an embryo to adult stage? ANS 2n=46
how much DNA is in a 2n organism at G1, S, G2, M? ANS 2c, 4c, 4c, 2c
what do unprotected cohesins hold together? ANS homologous chromosomes
Do protected or unportected cohesins get broken during anaphase 1? ANS unprotected
anaphase 2 breaks which cohesins? ANS protected
spermatogenesis and oogenesis are what type of process? ANS gametogenesis
Oogenesis: what are the end products? ANS one large haploid cell and polar bodies
Process of oogenesis? ANS 1) meiosis in fetus
2) pause in prophase 1
3) puberty - once a month cells resume meiosis, enter oviduct, can be fertilized
dizygotic twins occur how? ANS fraternal twins - 2 zygotes, 2 blastocysts
, two ways monozygotic twins occur? (least common) ANS 1 zygote splits at the two cell stage, 2
blastocysts OR 1 blastocyst splits into two -- same membrane for pregnancy
Corn produces ... ANS pollen and eggs
yeast produces... ANS a/alpha cells that produce a and alpha cells through meiosis
cell fusion ANS haploid yeast cells do this to make diploid cells (a/alpha cells)
what process makes one multicellular organism or many unicellular organisms ANS mitosis
can alpha fuse with alpha cells ANS no. alpha can only fuse with a
meisosis of a/alpha cell produces... ANS two a and two alpha cells
yeast uses what mechanism during mitosis ANS budding
nucleic acid rules? (5) ANS 1) made using triphosphate nucleotides
2) made 5' to 3'
3) made using ssDNA template
4) pair antiparallel
5) pair with complimentary base pairing
prokaryotic DNA and organelle DNA is ... ANS circular
eukaryotic DNA is ... ANS linear
DNA pols cannot reach the ends of DNA. What is the solution? (2 parts) ANS 1) telomere DNA
(sacrificial)
