Ask two questions about high school biology yiou .

1。It was measured that the amount of CO2 released by apple fruit was greater than the amount of O2 absorbed over a period of time, and it was inferred that the fruit ().

a.Aerobic respiration predominates b. Aerobic respiration consumes equal amounts of glucose to anaerobic respiration.

c.Anaerobic respiration predominates d. Both anaerobic and aerobic respiration are performed.

2.When buying canned food, you find that the words "If you find that the lid is bulging, do not buy" printed on the lid of the can, the most likely reason for the bulging lid is ().

a.Aerobic bacteria respire and produce CO2, H2O BMicroorganisms respire and produce CO2, C2H5OH

c.Lactic acid bacteria respirate and produce CO2, C3H6O3 DYeast respires, producing CO2, H2O

The first question can be compared, but the question does not give how much the condition is bigger, and the answer is different depending on the degree, so D is correct.

In the second question, the consumption of a and d is equal to the output, and the lactic acid of c is not produced with CO2, which is wrong, only B is correct, and the anaerobic respiration is carried out, and only more CO2 is generated.

Your question can be said in this way.

When you make the equation for aerobic respiration.

C 6 h 12 o 6 + 6o 2--6h 2 o + 6 co 2 that is, if there is only aerobic respiration, then the amount of CO2 and O2 must be equal, but now it is unequal (CO2 release is greater than O2 absorption), so there will be other cases.

Considering anaerobic respiration C 6 h 12 o 6--- c 2 h 6 o + CO2, did you find that there is only the release of CO2 and no absorption of O2, so this is the topic.

As for who has the advantage of the two, it can only be calculated according to the equation if the problem gives the ratio of Co2 and O2.

Got a topic? I don't seem to see your title!

No points, someone explained it very well.

1.This problem is mainly considered from the two steps of light and action, light reaction and dark reaction.

The light reaction mainly requires light, while the dark reaction is mainly related to the concentration of CO2.

In the XY segment, the diagram shows that the light intensity is relatively low during this period, and the plants need to absorb oxygen from the outside for aerobic respiration. This is a low-light environment, and photosynthesis is divided into two steps, light reaction and dark reaction. At this time, the light intensity is low, which affects the progress of the light reaction.

In the YZ segment, the light and action intensity on the graph are gradually increasing, and we need to consider the light and two steps, which affect both the light intensity and the CO2 concentration.

In the Z segment and beyond, the photosynthetic rate does not increase with the increase of light intensity, and the CO2 concentration related to the dark reaction is considered to be the most likely influencing factor, that is, the upper limit of CO2 uptake by plants is reached, and the light saturation point is reached. You said why you didn't fill in the temperature, because you can't see the relationship with temperature in the description of the question, and you asked about the main limiting factor.

2.The experimental setup depends on the difference between the light and the effect and the respiration, which is the amount of net photosynthesis. What is called net photosynthesis, that is, black algae will breathe and light, and respiration consumes oxygen, but light and sum can be produced, so black algae respiration will use the oxygen produced by light and action, and the oxygen discharged into the external environment is the amount of oxygen released.

Of course, the CO2 produced by the respiration of black algae will also be used by light, and the amount of oxygen produced by plants is generally more than CO2, (otherwise there will be no oxygen used by animals), so after this experimental setup, the experimental results will be seen from the tube of the colored droplets, that is, the released oxygen will gradually accumulate, and the pressure generated by the oxygen will press the small droplets to the right side.

Black algae itself is an aquatic algae, so it can breathe in water.

(1) The first void: the light intensity is not enough, resulting in the decrease of photosynthesis intensity, which can be seen from the chart: the horizontal axis represents the increase of the amount of light intensity, and the photosynthetic intensity gradually increases with the increase of it; When the amount of oxygen absorbed is 0, it is a critical point.

Plants need carbon dioxide to release oxygen, so the second void is light intensity and CO2 concentration; The third null has no temperature because the question sets the temperature to be constant at 30.

2) It can be respirated, but it is very weak and can be disregarded. It's like measuring the photosynthesis of plants at noon.

As far as the first question is concerned, the main factors affecting respiration are temperature, oxygen, carbon dioxide, light intensity and photosynthesis, but not respiration, and all temperatures are more important than CO2 concentration.

The second question is that black algae contains chlorophyll, which can be photosynthesized by light irradiation, produce oxygen, and can be respirated, and the precipitation of oxygen in CO2 buffer will cause small colored droplets to move.

(1) Because it has been indicated that it is at the optimal temperature.

2) This is an experimental device that measures the net photosynthetic rate, which can be used for respiration and photosynthesis, so it involves the change of two gases, oxygen and carbon dioxide, but he uses carbon dioxide buffer, which means that carbon dioxide will not cause a change in the volume of gas in the bottle, so the movement of the droplets is the oxygen produced by photosynthesis minus the oxygen absorbed by breathing, which is the net photosynthetic amount, understand?

Choose A. The proteins that make up living organisms are all -amino acids, i.e., -NH2 and -Cooh are attached to the same C atom.

1.Not protein.

2.Accord with. 3.No, -NH2 and -COOH are not attached to the same C atom.

4.Accord with. Only 2 of the 4 substances are -amino acids, and the dehydration and condensation of 2 amino acids form dipeptides, choose A.

(> Meow (> Meow A

The endpoint of the amino acid should have an amino-NH2, a carboxy-COOH and a hydrogen-H attached to the carbon c at the end.

Available Eligible Not eligible.

The form formed by the dehydration and condensation of two amino acids should be dipeptides, and a should be selected

A: Choose A. Analysis:

First of all, the amino acids are determined, and according to the general formula of the structure of amino acids, an amino group and a carboxyl, a hydrogen group and an R group are attached to the same carbon atom. where , is an amino acid. , not amino acids.

In this way, the compound composed of and is a dipeptide.

Choosing C is wrong because "Fe is very small in the cells of various organisms" The central element of hemoglobin in the human body is Fe, which is incorrect here and the words "very little" and "various organisms" are not accurate. "But it is an essential mineral element for plants" is also not correct here, the essential mineral element of plants is generally mg, because the core element of chlorophyll is mg

Select D for this question

There is a very similar question:

1.Of the following statements about the elements that make up plant cells, the correct one is c

and other six mineral elements account for about 97% of the total number of cells

They are all essential trace elements for plants.

Although it is found in very small amounts in the cells of various organisms, it is an essential mineral element for plants.

d.There are about 20 kinds of constituent elements in plants.

Plant cells are composed of a variety of elements, mainly C, H, N, O, P, S, CA, K, CL, MG, FE, MN, CU, ZN, MO, etc. Among them, the four elements C, H, N and O account for more than 90, which are the main components of various organic compounds.

Mineral elements essential for plants.

Solution culture, also known as hydroponics, is the method of cultivating plants in a solution containing all or part of the nutrients. Sand base culture (sand culture) is a method of cultivating plants by adding a solution containing all or part of nutrients to washed quartz sand or glass balls.

With the help of solution culture method or sand-based culture method, it has been proved that there are 3 kinds of elements from water or carbon dioxide, such as carbon, oxygen, and hydrogen, and 7 kinds of nitrogen, potassium, calcium, magnesium, phosphorus, sulfur, and silicon from the soil. The remaining 9 elements such as chlorine, iron, boron, manganese, sodium, zinc, copper, nickel and molybdenum also come from the soil, and the plant needs very little, and a little more will be poisoned, so it is called trace elements or trace nutrients.

Regarding the mineral elements necessary for plants, it is written in the new edition of the high school biology textbook: "In the past, scientists determined that there were 13 kinds of mineral elements necessary for plants, of which N, P, K, S, CA, and mg are a large number of elements; Fe (also known as: semi-trace elements), MN, B, ZN, CU, MO, CL are trace elements.

According to the latest edition of Plant Physiology (Higher Education Press), it has been proved that there are 16 kinds of mineral elements necessary for plant growth, that is, Si, Na and Ni are also listed as essential mineral elements for plants, of which Si is a large number of elements, and Na and Ni are trace elements.

The composition of plants is complex. In general, fresh plants contain 75%-95% water and 5%-25% dry matter. If dry matter is burned, the elements such as carbon (C), hydrogen (H), oxygen (O), and nitrogen (N) in it run away in the form of carbon dioxide, water, molecular nitrogen, and nitrogen oxides, leaving behind a residue called ash.

Therefore, in addition to carbon, hydrogen and oxygen, the essential nutrients of plants can be divided into two categories: nitrogen and ash. So far, more than 70 chemical elements have been found in plants, but these chemical elements are found in different amounts in plants, and the elements contained in them are not necessarily necessary for plant growth. Some elements may be accidentally absorbed by plants, or even accumulate in large quantities; On the other hand, there are some elements that require very little for plants, but they are all indispensable nutrients for plant growth.

This d is incorrect.

From this question select D

The answer is B, because there are 6 trace elements, which are iron, manganese, zinc, molybdenum, boron, and copper.

Don't bother! Because there are about 20 kinds of elements in the human body, and as a plant, there are even fewer

400 base pairs, that's 800 bases in the forest!

Among them, T120, A120, C280, G280!

A is connected to T by 2 hydrogen bonds of this stove, and C is connected to G by 3 hydrogen bonds!

So the total number of hydrogen bonds is Qiaochang = 120 * 2 + 280 * 3 = 240 + 840 = 1080.

One base corresponds to one deoxynucleotide, one phosphate group! So there are 800 phosphate groups!

120 for A and T, 280 for G and C; There are double bonds between A and T, and G and C are triple bonds, with a total of 120*2+280*3=1080 hydrofibrous ridge bonds. There are 800 free permeable phosphate groups, and each deoxynucleotide has a phosphate molecule, which is not too sure of the meaning of free.