首页
登录
职称英语
All living cells on earth require moisture for their metabolism. Cereal grai
All living cells on earth require moisture for their metabolism. Cereal grai
游客
2023-12-24
5
管理
问题
All living cells on earth require moisture for their metabolism. Cereal grains when brought in from the field, although they may appear to be dry, may contain 20 per cent of moisture or more. If they are stored in a bin thus, there is sufficient moisture in them to support several varieties of insects. These insects will, therefore, live and breed and, as they grow and eat the grain, it provides them with biological energy for their life processes. This energy will, just as in man, become manifest as heat. Since the bulk of the grain acts as an insulator, the temperature surrounding the colony of insects will rise so that, not only is part of the grain spoiled by the direct attack of the insects but more may be damaged by the heat. Sometimes, the temperature may even rise to the point where the stored grain catches fire. For safe storage, grain must be dried until its moisture content is 13 per cent or less.
Traditional arts of food preservation took advantage of this principle in a number of ways. The plant seeds, wheat, rye, rice, barley millet, maize, are themselves structures evolved by nature to provide stored food. The starch of their endosperm is used for the nourishment of the embryo during the time it over-winters (if it is a plant of the Temperate Zone) and until its new leaves have grown and their chlorophyll can trap energy from the sunlight to nourish the new-grown plant. The separation by threshing and winnowing is, therefore, to some degree part of a technique of food preservation.
The direct drying of other foods has also been used. Fish has been dried in many parts of the world besides Africa. Slices of dried meat are prepared by numerous races. Biltong, a form of dried meat, was a customary food for travelers. The drying of meat or fish, either in the sun or over a fire, quite apart from the degree to which it exposes the food to infection by bacteria and infestation by insects, tends also to harm its quality. Proteins are complex molecular structures which are readily disrupted. This is the reason why dried meat becomes tough and can, with some scientific justification, by likened to leather.
The technical process of drying foods indirectly by pickling them in the strong salt solutions commonly called "brine" does less harm to the protein than straightforward drying, particularly if this is carried out at high temperatures. It is for this reason that many of the typical drying processes are not taken to completion. That is to say, the outer parts may be dried leaving a moist inner section. Under these circumstances, preservation is only partial. The dried food keeps longer than it would have undried but it cannot be kept indefinitely. For this reason, traditional processes are to be found in many parts of the world in which a combination of partial drying and pickling in brine is used. Quite often the drying involves exposure to smoke. Foods treated in this way are, besides fish of various sorts, bacon, hams and numerous types of sausages. [br] Direct drying affects the quality of meat or fish because ______
选项
A、it exposes them to insects
B、it makes them hard
C、it damages the protein
D、it develops bacteria
答案
C
解析
这是道细节题。从第六段的“The technical process of drying foods indirectly by pickling them in the strong salt solutions commonly called’brine’does less harm to the protein than straightforward drying.”(通过把食物挑出来放在很浓的盐里面用来烘干食物的技术一般称为腌食物。这种方法对蛋白质的损害要小,反而是直接烘干尤其是直接放在高温下烘干对蛋白质的损害更大。)可以看出是对蛋白质造成破坏从而导致鱼或者肉很干。故选C。
转载请注明原文地址:https://tihaiku.com/zcyy/3300806.html
相关试题推荐
Alllivingcreaturespassoninheritedtraitsfromonegenerationtoother.A、the
Theplanwouldrequiretwo,orpossiblymore,classperiodsforitsfulfillment.
Jimmyearnshislivingby______worksofartinthemuseum.A、recoveringB、restori
Thebosswhospeaksequivocallywhentheyrequiretheiremployeestodosomethin
Butthat’sexactlywhatitfacedaftertheSovietUnioncollapsed.Livingcon
Butthat’sexactlywhatitfacedaftertheSovietUnioncollapsed.Livingcon
Butthat’sexactlywhatitfacedaftertheSovietUnioncollapsed.Livingcon
Butthat’sexactlywhatitfacedaftertheSovietUnioncollapsed.Livingcon
Butthat’sexactlywhatitfacedaftertheSovietUnioncollapsed.Livingcon
Linguisticresearchoftenrequiresaperiodoffieldworkwherethelinguistcan
随机试题
[originaltext]W:Hello,Patrick,isthatyou?M:YeahJane,whatcanIdofory
商品交换必须实行等价交换,这是商品经济必须遵循的一条重要原则。下列选项中对等价交
下列属于随园菜的代表名菜是()。A.素燕鱼翅 B.鳆鱼炖鸭 C.白玉虾圆
制备糊丸时,药粉与糊粉的比例是A:1:1B:2:1C:3:1D:4:1E
2020年1-12月份,全市固定资产投资3815.36亿元,同比增长6.1%。房
下列关于小组工作过程各阶段社会工作者角色的描述,正确的有( )。A.工作开始阶
泄泻在《内经》中称为A.下利 B.下痢 C.泄 D.泻
指数式报价是()。A.用90减去不带百分号的年利率报价 B.用100减去不带
下列选项中,不属于审计的前提条件的是( )。A.编制财务报表的基础恰当,且能够为
抓铲挖掘机可以挖掘停机面以上及以下的掌子,水利水电工程中常用于开挖()土。
最新回复
(
0
)