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balu736 [363]
3 years ago
7

A biologist identifies a mutant line of mice that lacks the cellular immune response. She suspects that a mutation in these mice

affects the ability of host cells to carry out the antigen presentation step during the activation phase. What could the biologist do to test her hypothesis
Biology
1 answer:
Pepsi [2]3 years ago
5 0

Answer:

Isolate antigen-presenting host cells from mice known to have an intact cellular immune response and inject these into the mutant mice to see if the normal response can be restored.

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What did Allan Savory notice about the lands grazed by wild animals at the Africa Centre for Holistic Management
Shkiper50 [21]

Answer:

Allan Savory noticed that grasslands co-evolved with large numbers of migrating ruminants, and therefore are co-dependent on each other's survival. These animals grouped together and constantly bunched due to the predator-prey connection, eat the grasses following the seasons throughout their migration in arid regions (Brittleness scale, of Non-Brittle to Brittle environments).

As they move, they drop nutrient-rich dung and urine, while trampling organic litter (live or dead grasses, leaves, etc) and seeds into the soil. These actions break down materials into the surface, providing more covered soil and keeping materials from chemically decomposing (oxidation, as opposed to the fast biological decomposition that occurs in areas with consistent rainfall(Non-Brittle)). The true testament to his insights of Holistic Management re: grasslands is known as the 4th Key Insight: That time, rather than numbers governs over-grazing or over-trampling.

The important component here is that the time exposed to these animals plays the significant role in whether you have healthy grasslands, not the number of animals exposed to the area of consideration. The amount of "rest" (time) for grasses between eating or trampling is just as crucial as the time in an exposure.

Explanation:

Explained in his book and courses under "Holistic Management", by Allan Savory and Jody Butterfield, and Sam Bingham

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3 years ago
O que é uma invasão térmica?
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Na meteorologia, uma inversão, também conhecida como inversão de temperatura, é um desvio da mudança normal de uma propriedade atmosférica com a altitude. Quase sempre se refere a uma inversão da taxa de lapso térmico. Normalmente, a temperatura do ar diminui com o aumento da altitude.
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4 years ago
Why do deciduous trees lose their leaves? a. Deciduous trees lose their leaves to prevent oxygen loss. b. Deciduous trees lose t
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The answer to your question is a 
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It would have to be D
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