Chromosomes inside the nucleus do not overlap with each other because
A. chromosomes are repelled from each other by their negative charges.
B. they all have a specific chromosome territory that is determined by the nuclear matrix.
C. the histone tails of the nucleosomes are repelled from each other by their negative charges.
D. the chromosomes are highly compacted by the formation of radial loop domains.
E. localized regions of the chromosomes are heterochromatic.
B. they all have a specific chromosome territory that is determined by the nuclear matrix.
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Which of the following is the most likely explanation for the lack of a filter blocking the passage of alcohol between the maternal and fetal circulations in humans?
A) There has not been enough time to evolve such a barrier. B) Such a barrier would probably also block important molecules that need to be passed to the fetus. C) The maternal and fetal blood mix directly together in an area with many villi, so a barrier is impossible. D) Alcohol has some positive effects on the fetus, so evolution has resulted in an intermediate level of filtering that blocks all but the worst abuses of alcohol.
Some microbes convert iron to magnetite which is then used as an internal compass to help position the microbe correctly in its environment.
Answer the following statement true (T) or false (F)
You discover a fungus that makes mainly asexual spores, but that occasionally makes sexual spores
When produced, the sexual spores come out of a thickened, hardened structure. A close examination of hyphae of this fungus reveals no septa. Into which group should you classify this fungus?
a. Glomeromycota b. Basidiomycota c. Chytridiomycota d. Zygomycota e. Ascomycota
The oocyte of a human female is usually fertilized in the
A) Ovary B) Vagina C) Uterus D) Oviduct E) Cervix