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3 years ago

Which of the following is a natural change to the balance of nature?

Biology

2 answers:

jasenka [17]3 years ago

8 0

Odrought is the answer I think

Stolb23 [73]3 years ago

5 0

Odrought is prolonged period of low rainfall which results to water shortage.

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Which of the following statement(s) is/are true of the kidney? A. Each kidney is approximately the same size as an adult’s fist.

vladimir1956 [14]

Answer: Option E.

A,B and C are correct.

Explanation:

Kidney is a bean shaped organ normally found in vertebrates. It is located posterior to the abdominal peritoneum. Kidney is well protected by ribs 10-12 , abdominal muscles, back muscles .kidney is about 11cm in length in adults. Kidney receives blood from the arteries and exist blood through the veins. Each kidney is attached to a ureter which harbour and carries urine to the bladder .Each kidney is approximately the same size as adult clenched fist(10cm). The main function of the kidney is excretion of wastes and urine.

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3 years ago

The term ____________________ describes one-celled microscopic organisms, some of which cause diseases in humans.

IRISSAK [1]

Answer will be germs like bacteria, virus, fungi, and protozoa that can cause disease

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2 years ago

On a warm day near the ocean, a breeze or wind often blows from the water to the land. Explain why this happens

Andrej [43]

Ans

Explanation:

Because the air is denser and at night the wind blows from land to water

8 0

2 years ago

Read 2 more answers

After infection of a cell, a viral particle must transport itself to the nucleus in order to produce viral proteins. What is the

kykrilka [37]

Answer:

Double-stranded DNA

Explanation:

If a virus requires to transport its genome in the nucleus to produce viral protein then the viral genome content must be DNA. This DNA of the virus will use the RNA polymerase of the host cell and will first convert into mRNA in the nucleus.

Then the mRNA of the virus will come out of the nucleus because the protein synthesis takes place outside the nucleus and in the cytoplasm. So in the cytoplasm by using host translational machinery the viral mRNA will code for viral proteins. So the correct answer is double-stranded DNA.

3 0

3 years ago

1. Suppose the synthesis of an amino acid was accomplished by four enzymes encoded by four genes that formed an operon. Draw a m

vivado [14]

I have attached lac operon model having 4 genes. See attachment for better understanding.

Answer:

The Lac operon is controlled by two signals.

Initiation

Glucose and lactose concentrations control the initiation of transcription of the Lac operon through their effects on the Lac repressor protein and Cap.

Lactose absent (Repression)

When lactose is absent, the Lac repressor binds the Lac operator and shuts off expression of the operon.

Lactose present (Transcription)

Addition of lactose increases the intracellular concentration of a related compound, allolactose. allolactose binds to the Lac repressor, causing it to undergo a conformational change that releases its grip on the operator DNa.

Glucose absent (Repression)

When glucose is absent, cyclic aMp (red triangle) is produced by the cell and Cap binds to DNA.

Glucose present (Transcription)

LacZ, the first gene of the operon, encodes the enzyme b-galactosidase, which breaks down lactose to galactose and glucose.

7 0

3 years ago