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2 years ago

Rocks can only be made up of one mineral or organic material. true false

Biology

2 answers:

Montano1993 [528]2 years ago

8 0

It's going to be false

EastWind [94]2 years ago

3 0

Answer:

The statement is false

Explanation:

Rocks make many layers on the surface on earth which make the earth crust. Minerals are the ingredients which are responsible for making rocks and every rock is made up of one or a mixture of minerals and these minerals are made up of one or more elements.

The common mineral that is responsible for making rocks are amphibole, olivine, calcite, mica, feldspar, and quartz. So when one or more than one of these minerals aggregate it form rocks. The common rocks are limestone, granite, sandstone, and basalt. Therefore the statement is false.

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If natural selection has no foresight, how can it explain features that seem to prepare organisms for future events? for example

Nezavi [6.7K]

The genes in a population give forth the genetic variability across a population (genotypes). In addition, occasional mutations of these genes in a population increase this genetic variability. Hovever, natural selection only favours reproduction of individuals with genes that are favourable in the environment/habitat. Therefore, natural selection has no foresight but is rather pegged on being an ‘opportunistic’ process.

4 0

2 years ago

What does barry see when he leaves the hive for the first time

Ad libitum [116K]

Tennis ball, flowers, and some other stuff.

5 0

2 years ago

Describe how temperatures above 35 C most likely affect the structure and function of the starch synthase in the particular stra

arlik [135]

Answer:

- It is very likely that temperatures above 35°C will change the structural configuration of the enzyme, denaturing it and preventing it from performing its function.

- According to the information, the most probable consequences for this rice crop is that its starch content will be lower, compared to crops grown at optimal temperatures.

Explanation:

<u>The full question includes this statement</u>:

<em>A rice grain is a fruit that encloses a seed. Most of the dry mass of a rice grain is starch. In rice plants, starch is produced by hydrolyzing sucrose and then linking the released glucose molecules together into starch . The optimal temperature range for starch synthase activity in a particular strain of rice is 27°C - 30°C. The optimal temperature range for sucrose synthase in the strain is 30°C - 35°C.</em>

One of the factors affecting enzyme activity is temperature, according to which an enzyme can make a reaction faster, slower or inhibit the activity of that enzyme.

For a grain of rice to acquire its starch content, the activity of two enzymes is required, sucrose synthase - to obtain glucose from sucrose - and starch synthase, to polymerize glucose into starch (see image).

<h3>In this case, how temperatures above 35°C most likely affect the structure and function of the starch synthase?</h3>

The temperature of 35°C is far above the optimum temperature required for the enzyme to act, so it is possible that a change in the structure of the enzyme will occur or that it will be denatured, preventing the starch synthase from performing its function. One consequence of this is a lower starch synthesis.

<h3>When the average temperature in the growing season is 33°C, what can be predicted about the consequences on the starch content in mature rice grains?</h3>

A temperature of 33°C is outside the range of starch synthase activity -even though it is optimal for sucrose synthase- which would decrease starch synthesis and, because of this, the rice grains in this crop would have less starch content.

Learn more:

Relationship between the reaction of velocity of an enzyme and temperature brainly.com/question/14198802

6 0

2 years ago

Normally, when food is placed in the mouth of any animal, the salivary glands start releasing saliva to help with chewing and di

frosja888 [35]

Answer:

An unconditioned response.

Explanation:

Pavlov was the process of studying salivation in dogs as a part of a research program on chewing and digestion. This is known as a normal reflex that is under personal choice or control and also called an unlearned evolutionary response.

In terms of Pavlov's analysis of learning, Pavlov built a device that would help to accurately measure the amount of saliva produced by dogs. In the case of Pavlov dogs, the food is called as the stimulus and salivation is called as a response.

3 0

2 years ago

If speciation occurred solely because of changes in chromosome counts between the original parents (who were 2n) and the offspri

Ket [755]

Answer:

Yes...This is an example of speciation by natural selection

Explanation:

As we know that natural selection always promote those evolutionary changes that are necessary. Changes that happen in chromosome number always promote with a specie that is closely related to the parent specie and produce fertile off-springs. These new generations are most adaptable and can survive in the environment more efficiently than the previous ones.

Additionally, other than natural selection, speciation can also happen as a result of random mutations, genetic drift and by means of artificial selection as well. But the natural likelihood of all these is probably low as compared to that of natural selection.

8 0

2 years ago