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asambeis [7]
3 years ago
14

Which of the following processes could result in the net movement of a substance into a cell, if the substance is more concentra

ted in the cell than in the surroundings?
a. Osmosis
b. Active transport
c. Diffusion
d. Facilitated diffusion
Biology
1 answer:
telo118 [61]3 years ago
4 0

Answer:

B.

Explanation:

The movement of substances(ions and molecules) against their concentration gradient is called Active transport.Since these substances are moving against whew they are already in abundance,extra energy is needed for them to move against this gradient.Therefore,ATP.,oxygen is needed by the cells undergoing this transport process to transfer substances into the cells.

It is useful for entry of substances in plants e.g glucose,and for transport of materials in intestine in man

Na-K pumps, exocytosis,endocytosis are examples of this transport process.

It is inhibited by lack of oxygen,cyanide etc.

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A transcriptional repressor that controls the transcription of gene A is not normally active unless bound by an effector molecul
iren [92.7K]

Answer:

Increase in transcription

Explanation:

Transcription is the process of forming RNA from DNA. It can be controlled by many factors like a repressor. Repressor can bind to the operator region of the promoter and hinder the movement of RNA Polymerase enzyme, halting the process.

Here, it is given that the repressor needs to first bind to an effector molecule X. Once it binds to X, it is activated and then it can bind to operator of gene A to inhibit its transcription. If the X binding domain on repressor is mutated it wont be able to bind to X. Thus it wont get activated and wont be able to attach to operator region to inhibit transcription. Hence, transcription process will keep going on uncontrolled.

5 0
4 years ago
What is
Alinara [238K]

Answer:

"the act of placing multiple text elements side by side to compare them"

Explanation:

the definition of juxtaposition is "the fact of two things being seen or placed close together with contrasting effect."

7 0
2 years ago
All cells of the body age and are replaced in a natural order. When RBCs age, they are destroyed in the spleen. During this proc
Ad libitum [116K]

Answer:

Bone marrow.

Explanation:

Hematopiesis may be defined as the formation of the blood cells by the precursor stem cells. This process occurs in the bone marrow, thymus and liver.

The red blood cells are enucleated cells with the minimum span of around 120 days. These cells are processed and destroyed in the spleen. The iron is recovered from the red blood cells and sent again into the bone marrow for the production of new blood cells.

Thus, the answer is bone marrow.

4 0
3 years ago
How are hypothesis tested ?
neonofarm [45]

In most cases, one uses tests whose size is equal to the significance level.

i would say by collecting data


4 0
3 years ago
Read 2 more answers
WHO IS RESPONIBLE FOR THE REACTIONS OF CELLULAR RESPIRATION
tatyana61 [14]

Answer:

Mitocondria is responsible for the reactions in cellular respiration.

Explanation:

Mitochondria have an important role in cellular respiration through the production of ATP, using chemical energy found in glucose and other nutrients. Mitochondria are also responsible for generating clusters of iron and sulfur, which are important cofactors of many enzymes.

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