Biology, 21.02.2021 22:20 tinaxiao

100 نشاط التركيب الضو
60
ريان
الغلوكوز
40
ففرحهن
20
10
50
480
4.00
عن الدور الأساسي لليخضور في عملية التركيب الضوئي
د لخضرورية تمتص بعض الإشعاعات الضوئية .
امتصاص (%) 1
الصبغات اليخضورية تملك القدرة على امتصاص
الإشعاعات الحمراء والزرقاء والبنفسجية بنسبة كبيرة
أما الإشعاعات البرتقالية والصفراء فتمتصهما بنسبة
طيف امتصاص اليخضور کماؤف لة
نی
صغيرة، بينما الإشعاعات الخضراء فلا تمتص . (لذا
تبدو معضم النباتات خضراء) .
- الإشعاعات الممتصة في الفعالة في التركيب الضوئی
الفهم تأثیر مختلف الإشعاعات الضوئية على
ما
عملية التركيب الضوئي نقترح تجربة انجلمان
14 : مقارنة بين طيف الإمتصاص وطيف النشاط
الشهية :
أولا : وضع طحلب أخضر خيطي ( الكلادوفورا ) تحت المجهر الضوئي ثم أضاءه بحزمة ضوئية تمر عبر
موشور زجاجي.
ثانيا : وضع في المحضر بکتیریا شرهة لثنائي الأكسجين فلاحظ أنجلمان أن البكتريا تتجمع بكثرة
المناطق المضاءة بالأطياف الحمراء و الزرقاء والبنفسجية بينما يكون تجمعها قليل في المناطق المضاءة
بالأطياف الصفراء والبرتقالية، ومنعدمة في المنطقة المضاءة بالطيف الأخضر. فاستنتج أن انطلاق ال 0
(شدة التركيب الضوئي ) تكون أعظمية في الأحمر والأزرق والبنفسجي وقليلة في الأصفر والبرتقالي
ومنعدمة في الأخضر وهكذا تحصل على طيف نشاط اليخضور الذي يكون مسايرا لطيف الامتصاص .

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Answer from: Quest

answer; ///(statins)/aka as hmg coa

Answer from: Quest

one would be wind another would be water density

Answer from: Quest

Mantle convection is the slow creepingmotion of earth's solid silicate mantle caused by convection currents carrying heat from the interior to the planet's surface.[1][2] the earth's surface lithosphere, which rides atop the asthenosphere (the two components of the upper mantle), is divided into a number of plates that are continuously being created and consumed at their opposite plate boundaries. accretion occurs as mantle is added to the growing edges of a plate, associated with seafloor spreading. this hot added material cools down by conduction and convection of heat. at the consumption edges of the plate, the material has thermally contracted to become dense, and it sinks under its own weight in the process of subduction usually at an ocean trench.[3]this subducted material sinks through the earth's interior. some subducted material appears to reach the lower mantle,[4] while in other regions, this material is impeded from sinking further, possibly due to a phase transition from spinel to silicate perovskiteand magnesiowustite, an endothermic reaction.[5]the subducted oceanic crust triggers volcanism, although the basic mechanisms are varied. volcanism may occur due to processes that add buoyancy to partially melted mantle causing an upward flow due to a decrease in density of the partial melt.secondary forms of convection that may result in surface volcanism are postulated to occur as a consequence of intraplate extension[6] and mantle plumes.[7]it is because the mantle can convect that the tectonic plates are able to move around the earth's surface.[8]mantle convection seems to have been much more active during the hadean period, resulting in gravitational sorting of heavier molten iron, and nickel elements and sulphides in the core, and lighter silicate minerals in the mantle.

Answer from: Quest

the african cheetah.

this species has a relatively low level of genetic

variation because the population was reduced to a small size approxi-

mately 10,000 to 12,000 years ago.

chapter outline

24.1

genes in populations and the hardy-

weinberg equation

24.2

factors that change allele and genotype

frequencies in populations

24.3 sources of new genetic variation

population genetics

until now, we have primarily focused our attention on genes

within individuals and their related family members. in this

chapter and chapters 25 and 26 , we turn to the study of genes in

a population or species. the field of

population genetics

is con-

cerned with changes in genetic variation within a group of indi-

viduals over time. population geneticists want to know the extent

of genetic variation within populations, why it exists, and how it

changes over the course of many generations. the field of popu-

lation genetics emerged as a branch of genetics in the 1920s and

1930s. its mathematical foundations were developed by theoreti-

cians who extended the principles of gregor mendel and charles

darwin by deriving formulas to explain the occurrence of geno-

types within populations. these foundations can be largely attrib-

uted to three scientists: sir ronald fisher, sewall wright, and j. b. s.

haldane. as we will see, support for their mathematical theories

was provided by several researchers who analyzed the genetic com-

position of natural and experimental populations. more recently,

population geneticists have used techniques to probe genetic

variation at the molecular level. in addition, staggering advances

in computer technology have aided population geneticists in the

analysis of their genetic theories and data. in this chapter, we will

explore the genetic variation that occurs in populations and con-

sider the reasons why the genetic composition of populations may

change over the course of several generations

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100 نشاط التركيب الضو
60
ريان
الغلوكوز
40
ففرحهن
20
10
50