When is gene expression blocked in the lac operon system?

Answers

Answer 1
Answer: The repressor protein blocks the genes from making mRNA.
Answer 2
Answer:

The depressor protein blocks the genes from making mRNA.

Absolutely sure!


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In what way is the European Union similar to a single, independent nation?A. It operates its own industries.
B. It has territorial borders.
C. It has its own bill of rights.
D. It trades with other nations.

Answers

The European Union similar to a single, independent nation because it has its own bill of rights. The answer to your question is C. I hope that this is the answer that you were looking for and it has helped you.

It has its own bill of rights.


Science is an impure and biased field. t/f

Answers

The correct answer to the question that is stated above is False. 

The answer is false because Science is not an impure and biased field. Everything in Science are seriously studied and investigated. Facts are well justified and support for the said facts are always ready to be presented whenever the said presented facts are questioned.

True


Science is often tainted by biases in the science community.

During which process is ethanol produced?A-lactic acid fermentation
B-alcohol fermentation
C-citric acid cycle
D-electron transport chain

Answers

Answer:

The correct answer would be B-alcohol fermentation.

Alcohol fermentation or ethanol fermentation is a type of anaerobic respiration by which organism (such as yeast) convert sugar such as glucose, sucrose et cetera into ethanol and carbon dioxide in order to produce energy.

First, glucose is converted into 2 molecules of pyruvate by the process of glycolysis. It leads to the formation of 2 molecules of ATP (adenosine triphosphate) and 2 molecules of NADH.

Then, two molecules of pyruvate are converted into two molecules of acetaldehyde with the help of enzyme pyruvate decarboxylase. Two molecules of carbon dioxide are released as a byproduct.

Lastly, two molecules of acetaldehyde are converted into two molecules of ethanol with the help of enzyme alcohol dehydrogenase. It consumes two NADH and regenerates two NAD⁺ lost during the process of glycolysis.

Hence, the net gain of alcohol fermentation is two ATP.

Thus, we can say that ethanol is produced during alcohol fermentation.

During alcohol fermentation ethanol is produced.

Alcohol fermentation involves the break down of sugars in organisms such as yeast to form ethanol or alcohol, carbon dioxide and release energy.

Further Explanation;

Anaerobic respiration

  • Anaerobic respiration on the other hand is a type of respiration that occurs in absence of oxygen gas.
  • It involves the breakdown of organic compounds to form small amount of energy in the form of ATP and ethanol or lactic acid as byproducts.

Alcohol fermentation

  • Alcohol fermentation is a type of anaerobic respiration where an alcohol is formed as a byproduct.
  • During alcohol fermentation organism such as yeast convert sugars such as glucose, sucrose into ethanol and carbon dioxide in order to produce energy.

Stages of Alcohol Fermentation

Glycolysis;

  • One glucose molecule is broken down to pyruvate and two molecules of ATP are formed. This leads to generation of two molecules of ATP and two molecules of an energy carrier NADH.

Fermentation;

  • Pyruvate from glycolysis is converted to ethanol.
  • This occurs in two steps

Step 1

  • Pyruvate is first converted into two molecules of acetaldehyde, which is catalyzed by the enzyme pyruvate dehydrogenase and two molecules of carbon dioxide are released as byproduct.

Step 2

  • Acetaldehyde is then converted into ethanol by the enzyme alcohol degydrogenase which consumes the two molecules of NADH and regenerates NAD+ used during glycolysis.

Keywords: Anaerobic respiration, Fermentation, alcohol fermentation, Glycolysis, steps involved in alcohol fermentation

Learn more about:

Level: High school

Subject: Biology

Topic:  Respiration

Sub topic: Alcohol fermentation

Using the characteristic chart provided, which of the following characteristics would absolutely identify a flowering plant and eliminate the other species?A.Its seeds are often developed in a cone.
B.It has true leaves, stems, and roots.
C.It's often found in dry places.
D.The seeds are enclosed in a fruit.

Answers

Out of all the characteristics listed below, the flowering plant has the character of The seeds are enclosed in a fruit. The last option is correct. Flowering plants are angiosperms; hence, the seed is enclosed.

What are the characteristics of the angiosperm?

Angiosperms are advanced plants because most of them are land plants with flowering and seed inside the fruit. When pollen from the male part falls on the stigma of the female part, it can enter the ovule and fertilize it to form a zygote by fusion, and later that is developed. Pollination of these plants can occur through the wind or through pollinators that aid in the process by adding male pollen to the flower.

         

They are considered vascular plants, as they do possess vascular bundles such as xylem and phloem that carry water and food particles to different parts of the plant. These plants extract resources from the soil using various methods, including active and passive transport, and these are required for plant development.

Learn more about the angiosperm here.

brainly.com/question/9416370

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A describes a gymnosperm.

B describes any type of plant.

C is too vague to even describe a plant.

D (the correct answer) describes an angiosperm (flowering plant). After double fertilization, angiosperms form a fruit over the ovulary of the plant, where the seeds are located.

Gastropods have a “vertebrate eye”—a highly advanced visual system. True
False
Arthropods are the most numerous phylum.
True
False
Some arthropods do not have jointed appendages.
True
False
If you randomly selected one animal on Earth, it would probably be a crab.
True
False
Spiders and centipedes are part of the class Crustacea.
True
False
Arthropods have exoskeletons.
True
False
Crustacea and Insecta are classes of mollusks.
True
False
A lobster’s cephalothorax, which is a combination head and thorax, is an example of arthropods’ segmented body plan.
True
False

Answers

1._false
2._true
3._false
4._false
5._false the are Arthropods
6._true
7._false
8._true

How are populations, ecosystems, and communities related?a. A community consists of an ecosystem and its physical environment, and an ecosystem is made up of many different populations of organisms.
b. A population consists of a community of organisms and its physical environment, and a community is made up of many different ecosystems.
c. An ecosystem consists of a community of organisms and its physical environment, and a community is made up of many different populations of organisms.
d. An ecosystem consists of a population of organisms and its physical environment, and a community.

Answers

The answer is C. Hope that helps ;)