Multiple organisms, solve, one organism solve

Question 1: Choose C

Because: the completion of the reflection requires the cooperation of multiple living systems, such as the nervous system, the motor system, and even the respiratory system, the internal circulatory system and other systems. It is not possible to do this with just one cell or a clump of cells, so options A and B are wrong.

In the answer d, if only the nervous system is relied on, then the person cannot complete the hand withdrawal reflex, at least only feeling, not the hand is withdrawn!

Question 2: Choose A

This is because tissues are made up of multiple cells, while organs are made up of multiple tissues. Plants contain 5 major organs, namely roots, stems, leaves, flowers, and fruits (including seeds). So organs are the building blocks of plants!

From this, the answer is A

Question 3: Choose B

Because: A medium: the virus cannot complete metabolism independently, because it does not have an independent cell structure, and it needs to rely on cells to complete its life activities!

Middle: Virus-free cell structure.

D: It doesn't mean that the composition contains proteins and nucleic acids is a living organism, if it is an inanimate object, even if the composition contains proteins and nucleic acids, it is not a living thing!

Question 4: Choose C

The multiplication, differentiation and growth of cells in A, B and D all require energy, and these energies need to be provided by cellular metabolism, so cell metabolism is the basis of cell life, and it is also the basis of material and energy exchange between organisms and the environment.

Question 5: Choose A

A: There is a direct connection between cells and the biosphere, because the biosphere includes living things, and organisms are made up of cells (excluding viruses), so there is a direct connection between cells and the biosphere.

Even if you don't, option A can be excluded from the three options B, C, and D).

Question 6: Choose C

Because: E. coli colonies in petri dishes are cultured from one E. coli, so they are the same group.

A: All the fish in the South China Sea include many species of fish, and they are multiple species.

B: All locusts also include many species of locusts, and like A, they are multiple populations.

D: The range is larger, including almost all the organisms in the pond, and also includes the abiotic part. The range is larger than that of A and B!

A can first be inferred that it is an autosomal recessive disease, because the wife's sister is sick but the parents are normal.

So both parents are AAs

The probability that both husband and wife are AA is 2 3 * 2 3 = 4 9, and the probability of the offspring being sick is 4 9 * 1 4 = 1 9

Pictorial representation. The black lead limb color font is a known condition.

The blue font is the process of solving the cave source problem in the Huai Trembling World!! Too professional I won't say!!

Dizzy, I can't see the picture in the first question, how to answer it? The second question seems to choose D, which is available on the first few pages of your biology textbook.

I choose AFigure A is the development of corn seeds. Figure B shows the development of soybean seeds.

Because corn has endosperm, the endosperm and the embryo develop together. The endosperm of soybeans is absorbed by the embryo during development, and the content is decreasing to zero. I choose D

Because of too much insulin injection. Blood sugar levels are lowered to hypoglycemia. Causes symptoms of hypoglycemia.

Question 1 is A. The endosperm is the last in corn, while soybean is a dicot, and its endosperm will eventually be absorbed, and eventually the cotyledons (cotyledons are part of the embryo) are more developed. Thus, the D curve in Figure B represents the endosperm and the C curve represents the cotyledons.

The error in Figure A is that the A and B curves are both high, indicating that the endosperm and cotyledons are well developed, which does not quite match the characteristics of maize.

Select D for the second question. Insulin lowers the blood sugar concentration in mice, and the blood sugar concentration decreases and the energy ** is insufficient, resulting in symptoms such as sluggishness and reduced activity.

High school biology, right? It shouldn't be misleading. Hehe.

According to the title, in this plant species, the genotype of the tall stem is t; The genotype of the dwarf stem is tt; The genotype of the green stem is r; The genotype of the purple stem is RR

Tall stems account for 63 +21 =84, short stems account for 12 +4 =16, green stems account for 63 +12 =75, and purple stems account for 21 +4 =25 So the frequency of the T gene is 16, which is equal to 2 5

Then the gene frequency of t is 1-2 5=3 5

Similarly, the gene frequency of r is 25 = 1 2

Then the gene frequency of r is 1-1 2=1 2

So the percentage of plants with genotype TT is 3 5 3 5=9 25=36 and the percentage of plants with genotype TTR is (3 5 3 5) (1 2 1 2) = 9 25 1 4=9 choose B

What does tt mean by the lack of conditions in your question?

1. Select all the b, the topic says that the aboveground part of the plant grows towards the light, and the roots grow in the backlight.

From the diagram, you can see that the light source is coming in from the left side, so the seedlings should grow to the left, and the seedling roots should grow to the right.

Check it out in my collectionGood moviesClassic movies that you must watch in your life 1. Top 10 Best Science Fiction Films: 1) Star Wars series: Created a movie myth.

1. There are bubbles coming out.

2. The globulus is swollen.

3. Full contact.

4. In order to provide a better environment, yeast is suitable. Cooler will slow down the reaction rate.

5. No, there is no sugar for the yeast to ferment.

1. Bubbles appear.

2. The small balloon is inflated.

3. Make the yeast fully in contact with nutrients.

4. In order to provide conditions conducive to yeast fermentation. Low temperature, not suitable for yeast fermentation, will reduce the reaction rate.

5. No, there is a lack of substrates (nutrients) for yeast fermentation (wine is fermented by yeast to produce carbon dioxide).

Single-celled green algae and yeast were cultured separately in the same medium in a bright place, and the results are shown in the figure. The reason for the decrease in the number of yeasts is the decrease in the culture medium (the consumption of nutrients), while the reason for the increase in the number of green algae is (the photosynthesis of green algae in the presence of light).

The answer is: b.

One of the base pairs is A5 after the first replication of At, one of the base pairs is C5 after the second replication, and one of the base pairs is Cg after the first replication.

(1) Internal environment: plasma, tissue fluid, lymph.

2) Digestive system urinary system.

3) Digestive circulatory system.

4) Circulatory system urinary circulatory system respiration.