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nikitadnepr [17]
3 years ago
11

How much of earth's atmosphere is oxygen

Biology
1 answer:
lora16 [44]3 years ago
7 0
Answer- 21 percent : )
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The cell is taking in substances through membrane proteins, without any energy expenditure of its own. The substances naturally
Serga [27]
Protein channels + no energy spent + following concentration gradient = passive transport via facilitated diffusion :)
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3 years ago
Which of the following pairs reflects a relationship to addiction? a. medulla oblongata—craving b. cerebellum—reward c. hippocam
weeeeeb [17]

Answer:

The correct pair is -'d' that is nuclear accumbens-reward.

Explanation:

The location of nuclear accumbens is the basal region of fore brain.This is the part of basal ganglia.

This is an important part of ventral striatum along with dorsal striatum which from the basal ganglia.

The main structure of nuclear accumbens are core and shell.

The shell region is also called as NAcc shell is located in the outer region of the nuclear accumbens also called as dorsal amygdala.

The core region NAcc core is located in the inner region of the nuclear accumbens  and considered to be a part of basal ganglia.

This region control the reward and punishment centers that are present in the brain. This contain another function which is associated with psychotic problem such as depression, addiction and ablation etc.

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3 years ago
How is temperature regulated in the testes for maximal spermatozoa production?
lora16 [44]
Normal development in tests requires a temperature. cremaster muscle contract or relax to move testes toward or away from the body or to maintain the acceptable temperature for testicular.
The body temperature regulation is controlled by the autonomic nervous system under the guidance of medulla oblongata which is in the brain system.
8 0
3 years ago
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If a mutation in the dna of an organism results in the replacement of an amino acid containing a polar r-group with another amin
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The R group of the proteins are side chains which are specific to each protein and which confer specific chemical properties to the proteins. The R group determines the size, polarity and the pH of the protein.
In the case of the protein where the amino acid containing a polar R group is replaced with another amino acid containing non polar R group, the TERTIARY structure of the protein might be affected. Structure will be affected if the protein is hydrophillic and the R group is hydrophobic. 
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a factory owner might decide to manufacture shirts in parkistan instead of the United States because ?
mestny [16]

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A factory owner might decide to manufacture shirts in Pakistan instead of the United States because it is less expensive to make shirts there.

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2 years ago
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