1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
madreJ [45]
4 years ago
7

Indicate the level of activity of the lac operon under the medium conditions listed below:

Biology
2 answers:
Irina-Kira [14]4 years ago
6 0

Answer:

a) No lactose present, no glucose. The lac operon is inactive.

b) Lactose present, no glucose present. The lac operon is active

c) No lactose present, glucose present. The lac operon is inactive

d) Lactose present, glucose present. The lac operon is inactive.

Explanation:

The lac operon is a group of genes  that codifies for a group of enzymes that have the ability to digest lactose in order to use the energy in it. The lac operon will be active only when there is no glucose in the system to use it as an energy source, if there is glucose the lac operon will be inactive and if there is glucose and lactose the lac operon will also be inactive due to the fact that the bacteria prefers glucose.

Orlov [11]4 years ago
3 0

Explanation:

The lac operon is an operon required for the uptake and metabolism of lactose in bacteria. The carbon primary source for bacteria is glucose but when not available other sources of carbon can be use up such lactose.

Bacteria express the lac operon genes, which encode key enzymes for lactose metabolism. The lac operon is turn on when lactose is available, and glucose is not available.

Answers:

A. No lactose and no glucose present- lac operon is not activated

B. Lactose present and no glucose present- lac operon is activated

C. No lactose present and Glucose present- lac operon is not activated

D. Lactose present and Glucose present- lac operon is not activated.

You might be interested in
_______ lowers modest amounts of blood glucose and boosts the body's sensitivity to insulin.
garik1379 [7]

Exercise lowers modest amounts of blood glucose and boosts the body's sensitivity to insulin.

Blood glucose is the concentration of sugar dissolved in the blood of a person. It is the prime source of energy for the body. When the blood glucose is very high, the person is likely to be diabetic. Exercise is necessary to burn the excessive glucose molecules in order to gain energy for the exercise.

Insulin is a polypeptide which regulates the glucose levels in the body. It is secreted by the pancreatic cells called Islets of Langerhans. The structure is composed of two chains: A chain and B chain, joined together by the disulfide bonds.

To know more about blood glucose and insulin, here

brainly.com/question/8394646

#SPJ4

8 0
2 years ago
What adaptations do these animals have? crocodiles answer 1 frogs answer 2 bats answer 3 coelacanths answer 4 lampreys answer 5?
umka2103 [35]
Adaptations are what organisms do in order for them to survive and adapt to the environments that Mother Nature is presenting them. 

1. Crocodiles - have tough and scaled skin that allows them to camouflage and catch prey in the water 

2. Frogs - have developed bodily fluids that secrete poison to prevent predators from attacking them 

3. Bats - have developed their echolocation to help them in hunting for food at night time. 

4. Coelachants - have maintained their extra fins for sensory motor in the water

5. Lampreys - have maintained their tooth-funnel like mouths in order to feed on their hosts.
5 0
4 years ago
Surfactant:
BARSIC [14]

Answer:

The correct answer will be option-D

Explanation:

Pulmonary Surfactant is a complex substance produced by the pneumocytes epithelial II cells in the alveolar sac.

The surfactant is composed of the proteins and lipids which plays a role in keeping alveoli open by reducing the surface tension formed between the air and liquid.

The surfactant act by forming a monolayer surface film which helps reduce the surface tension.

Thus, option-D is the correct answer.

3 0
3 years ago
What may a salesperson say when you enter a store?
muminat

Answer : Option D) en que puedo servirle


Explanation : Anytime if someone enters into a store the sales person always asks for the requirement of the customer's demand in spanish it will be en que puedo servirle. It is a good gesture for gaining more customer satisfaction of a particular store.

7 0
4 years ago
Read 2 more answers
Students were given a list of seven elements and asked to identify the four elements that are most abundant in biomolecules. Whi
Vadim26 [7]

Biomolecules are important for living organisms and vital for cell structure and functioning. The cells are made up of biomolecules as their structural organization.

The four most abundant biomolecules are:

<u>Carbon, Oxygen, Nitrogen and Hydrogen</u>

The biomolecules can be explained as:

  • The central biomolecules for life activities are these elements that contribute to major processes.

  • The main building blocks like carbohydrate is composed of carbon, oxygen and hydrogen. They provide energy to the body by breaking into small molecules.

  • Proteins are vital for cell signalling and transport. They are composed of amino groups consisting of nitrogen.

Therefore, carbon, nitrogen, hydrogen and oxygen are the most abundant biomolecules.

To learn more about biomolecules follow the link:

brainly.com/question/15157257

6 0
2 years ago
Read 2 more answers
Other questions:
  • Through which of the following body parts do humans take in the energy they need to survive? . A - mouth . B - intestines. C - s
    7·2 answers
  • Not all areas on Earth's surface receive the same amount of radiation because Earth's surface ____. a. is flat c. has continents
    5·2 answers
  • Which statement describes gravity? Check all that apply
    10·1 answer
  • The skin is composed of which type of tissue?
    6·1 answer
  • The exchange of gases and nutrients between the blood and the tissues occur in blood vessels called
    14·1 answer
  • Locations of quantitative genes on chromosomes are called:
    12·2 answers
  • Coral reefs are ideal breeding grounds for a variety of fish and sea creatures, and coral is considered a foundation species. Un
    5·2 answers
  • Wind tends to move from _
    7·2 answers
  • a cell's membrane potential is maintained by the movement of ions into and out of the cell. A model showing the influence of mem
    11·1 answer
  • What are two main ways that water is being polluted
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!