Consider this microscopic image of bacteria.

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

HELP ASAP PLZ!!! Read the scenario: You are walking a trail in the woods. You notice something out of the corner of your eye and

sergejj [24]

The warmth and redness of the surrounding area of the cut is due to the immune system.

Blood carries white blood cells, which attacks pathogens (Cause of infection)

The surface become red and warm as that is a conjugating area of blood.

3 0

3 years ago

Read 2 more answers

1. Do some research and try to identify one to three types of microbes cultured on your plates. Using any resources available to

yarga [219]

Answer:

I have identified Escherichia coli and Bacillus sp.

Explanation:

I obtained my sample from soil, in a park near my house. The common bacteria on soil are gram positive and gram negative.

I found rods, and some are gram positive and long. They others are gram negative and very small and short.

The color of the gram positive is a dark blue, almost purple, and they are big and abundant, they are almost in lines, so I think they are a species of Bacillus.

The gram negative bacteria are extremely small and they look hot pink. They are very probably enterobacteria, and the most common enterobacteria is Escherichia coli. They do not have a particular order of arrangement.

5 0

3 years ago

Which of the following is an observation?

Svetach [21]

Answer:

a. You record the air temperature every day for a week.

Explanation:

Recording air temperature every day for a week can be classified as making an observation.

Observation is a part of the scientific method. It is a basically a way of collecting data.

During observation, our senses can be used or instruments.
Depending on the nature of the study, specialized instruments helps to bridge the limitations of our senses.
A good scientist is a keen observer.
Making a record of air temperature usually by using a thermometer is a way of carrying out observation.

When you record air temperature, you are making an observation.

7 0

3 years ago

A

lorasvet [3.4K]

Answer:

well you see its b

Explanation:

its just b

4 0

2 years ago