2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Nyob hauv qab. Peb lub hauv paus yog los ntawm peb cov tawv nqaij pigments xws li melanin thiab carotene. Cov no pigments hloov ib yam li peb muaj hnub nyoog, thiab cov tawv nqaij sov tuaj yeem txias thaum lawv muaj hnub nyoog. Yog li cov xim uas haum rau koj thaum koj tseem yau yuav tsis haum koj li koj hnub nyoog.
Puas daim tawv nqaij hloov ntawm txias mus sov nrog hnub nyoog?
Koj lub caij tsis hloov raws li koj hnub nyoog. Skintone yog txiav txim los ntawm noob caj noob ces, thiab koj cov tawv nqaij, txawm sov los yog txias, ci los yog mos, yog ib yam dab tsi koj yug los thiab yuav nqa mus rau hauv koj lub neej. … Thiab thaum peb muaj hnub nyoog, qee zaum peb tuaj yeem hloov mus rau ntau hom sub-type hauv peb lub caij nyoog palette.
Koj cov tawv nqaij puas hloov xim raws li koj hnub nyoog?
Nrog kev laus, txheej txheej ntawm daim tawv nqaij (epidermis) thins, txawm tias cov txheej txheem ntawm tes tseem tsis hloov. Tus naj npawb ntawm cov pigment-muaj cov hlwb (melanocytes) txo qis. Qhov seem melanocytes loj tuaj. Cov tawv nqaij laus zoo li thinner, paler, thiab meej (translucent).
Vim li cas kuv cov tawv nqaij thiaj sib dua thaum kuv muaj hnub nyoog?
Kev laus. Kev hloov ntawm daim tawv nqaij feem ntau tshwm sim rau cov neeg muaj hnub nyoog 50 xyoo. Ib yam li lwm cov kab ke hauv koj lub cev tau hnov ntxhiab, koj cov tawv nqaij ua thinner thiab dryer thaum koj muaj hnub nyoog thiab muaj ntau dua tuaj yeem tsim scaly. patches thiab discolorations.
Vim li cas kuv cov tawv nqaij hloov pauv?
Kev hloov pauv hauv melanin tuaj yeem tshwm sim los ntawm hloov cov tshuaj hormones thiab tshuaj. Txawm tias melanin pigment yogxim av, nws cov tsos hloov xim lub ntxaum nws rests nyob rau hauv daim tawv nqaij. Qhov no yog vim qhov tshwm sim ntawm qhov muag pom hu ua Tyndall effect. Sib sib zog nqus thaj ua rau melanin yuav saib ntsuab, grey, txawm xiav.
Pom zoo:
Puas yog tawv nqaij tawv nqaij tawv nqaij khawb yooj yim?
tawv tawv, zoo li calfskin, tuaj yeem nkag siab rau khawbtab sis tau yooj yim rov qab los ntawm tus kws tshwj xeeb lub hnab. Puas yog tawv nqaij tawv tawv tawv tawv? Feem ntau hais lus, calf tawv yog ruaj khov, tshwj xeeb tshaj yog rau nws qhov hnyav thiab tuab.
Dab tsi yog qhov hloov pauv thiab hloov pauv hloov pauv?
Point mutations hloov ib leeg nucleotide. Frameshift kev hloov pauv yog ntxiv lossis tshem tawm ntawm nucleotides uas ua rau muaj kev hloov pauv hauv kev nyeem ntawv. frameshift thiab point mutation yog dab tsi? Ib qho kev hloov pauv cuam tshuam rau ib khub hauv paus.
Qhov kev hloov pauv no puas yuav ua rau muaj kev hloov pauv hloov pauv?
Yog li, yog tias muaj kev hloov pauv, piv txwv li, kev ntxig lossis tshem tawm ntawm nucleotide, tshwm sim, qhov no tuaj yeem ua rau kev hloov pauv ntawm kev nyeem ntawv. Nws hloov tag nrho cov amino acid ib ntus. Cov kev hloov pauv no yog hu ua frameshift mutation (tseem hu ua kev nyeem ntawv hloov pauv, nyeem ntawv hloov pauv, lossis framing yuam kev).
Puas yog jurassic ntiaj teb hloov pauv hloov pauv hloov pauv?
Qee zaum, paub meej, koj yuav tau rov qab mus rau lub sijhawm dhau los - txuag manually, thiab feem ntau, raws li game's autosave yog… tsis zam txim - tab sis feem ntau ntawm cov lub sijhawm koj tuaj yeem khaws cov khoom thiab khaws cia nrog.
Qhov twg yog qhov kev hloov pauv hloov pauv hloov pauv?
Semiconservative replication piav qhia txog cov txheej txheem ntawm DNA replication nyob rau hauv tag nrho cov paub hlwb. DNA replication tshwm sim ntawm ntau lub hauv paus pib ntawm kev rov ua dua raws DNA qauv strand. Raws li DNA ob chav helix yog unwound by helicase, replication tshwm sim nyias ntawm txhua tus qauv strand nyob rau hauv antiparallel cov lus qhia.
