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4 years ago

Which is heavier—warm or cold air?

Biology

2 answers:

lilavasa [31]4 years ago

7 0

Answer:

Cold air

Explantion:

Cold air is denser than warm air. The molecules are packed closer together. The more water vapor that is in the air, the less dense the air becomes. That is why cold, dry air is much heavier than warm, humid air.

Leona [35]4 years ago

5 0

Answer:Cold air is heavier that warm air

Explanation:

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Si cruzo dos rosas rojas ambas heterocigotas (Rr)

musickatia [10]

Answer:

GRACIAS

Explanation:

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3 years ago

In an experiment, researchers find that certain neurons in the visual cortex preferentially fire in response to a bar of light t

Montano1993 [528]

Answer:

Feature detection

Explanation:

Feature detection involves different neurons that are activated in response to specific stimuli. For example, feature detectors are activated in the cerebral cortex through visual stimuli of specific shapes or patterns. These neurons become more and more complex as the stimuli also become progressively more complex and specific. Featured detector neurons have been identified in the toad vision, where they have been involved in the toad's behavior in response to worm-like moving stimuli (e.g., orienting), and the bat auditory cortex, where they have been involved in the measurement of the distance between the bat and its prey.

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3 years ago

In 3-5 sentences, construct a summary of the process of gene expression, starting with DNA and ending with proteins.

sveta [45]

The mechanism of gene expression initiates with the process of transcription in which the genetic information in the DNA is into genetic codes in the form of messenger RNA.

<h3>What is the process of gene expression followed by transcription?</h3>

The process of gene expression followed by transcription is processed through the messenger RNA which then undergoes some processing such as modification of tails and removal of non-coding sequences before the genetic codes are translated to their respective amino acids in a process known as translation.

The amino acids are typically associated together by peptide bonds and the resulting primary protein structure is folded in specific ways depending on their functions.

To learn more about Gene expression, refer to the link:

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2 years ago

Why is genetic variation a prerequisite for evolution??

algol13

Genetic variation is a prerequisite for evolution because natural selection relies upon lessening the frequency of alleles in a population therefore there must be variance in the gene pool

5 0

3 years ago

What is the biochemical explanation for why adding glucose to a bacterial culture containing lactose significantly decreases pro

MatroZZZ [7]

Answer:

If we add glucose to the culture with lactose, the lac operon would be turned off and the production of beta-galactosidase, other enzymes and molecules that the operon transcribes, would decrease.

On the contrary, if we add lactose to a bacterial culture containing glucose, the lac operon would be on, transcribing the genes, hence, producing beta-galactosidase but only at a small rate. Because the bacteria already got the energy from the glucose.

Explanation:

An operon is a group of structural genes whose expression is regulated by a promoter, operator and regulator genes. In this particular case, they are talking about the lactose operon, lac operon. This operon is required, in bacteria, to obtain energy from lactose when there is no glucose present.

The lac operon contains a series of genes, lacZ, lacY, and lacA. The gene LacZ codifies an enzyme required to break the lactose, beta-galactosidase. LacY codifies for another enzyme required in the transport of lactose inward the cell. And finally, LacA produces a molecule that is involved in detoxification.

The lac operon is regulated, among others, by the presence of glucose and lactose. The glucose is the preferable source of energy for bacteria so if there are lactose and glucose the glucose would be used for energy at a bigger extent. In the absence of glucose, the lac operon plays a vital role and helps the bacteria to obtain energy from lactose.

When there is glucose but no lactose available, there is a repressor than binds to the promoter so the lac operon is OFF cannot express the genes.

On the other hand,when there is lactose and no glucose, lactose enters the cell and some of this molecules turn to alolactose. Alolactose molecules bind to the repressor so the operon is not repressed anymore and the lac operon would be ON producing enzimes and molecules.

If the lac operon is ON ( glucose absent ) the production of beta-galactosidase would be high, on the other hand, if the operon is OFF (glucose present) the production of beta-galactosidase decreases.

In the presence of both lactose and glucose, the genes for the lactose metabolisms are transcribed at low rates in the lac operon.

4 0

3 years ago