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alisha [4.7K]
3 years ago
7

Water would be an example of __________, whereas the water cycle would be an example of __________

Biology
1 answer:
SSSSS [86.1K]3 years ago
5 0
<span>ecosystem good; ecosystem servic</span>
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All of the following statements about enzymes are true, except: a. They increase the rate of a reaction. b. They function in an
tekilochka [14]

Answer:

c. A single enzyme typically reacts with many different substrates.

Explanation:

Enzymes are proteins that have catalytic activity and they are specific. This means that a single enzyme has only one specific substrate. They act as a "lock and key" complex, so one substrate activates to one enzyme.

Also, enzymes accelerate the rate of a reaction by lowering its activation energy. Finally, they can act in an aqueous environment, so the answer is c.

7 0
3 years ago
1) Which of the following brain regions is indicated by the arrow?
stellarik [79]
Answers: 
1.) D
2.) B

The pons plays a crucial role in REM sleep, which is the state of sleep in which dreaming occurs. 
8 0
3 years ago
How many somatic motor neurons stimulate one muscle fiber?
jeka94

Answer:

one motor neuron

Explanation:

Although a single motor neuron can innervate several muscle fibers, each muscle fiber is innervated by only one motor neuron

8 0
2 years ago
A(n) _________ scan uses radioactive markers in the blood to monitor blood flow and metabolic activity via x-ray.
olya-2409 [2.1K]

Answer;

-PET scan

A PET scan uses radioactive markers in the blood to monitor blood flow and metabolic activity via x-ray

Explanation;

-A positron emission tomography (PET) scan is an imaging test that helps reveal how the tissues and organs are functioning. A PET scan uses a radioactive drug (tracer) to show this activity. This scan can sometimes detect disease before it shows up on other imaging tests.

-A PET scan is used to diagnose certain health conditions, to plan treatment, to find out how an existing condition is developing, and to see how effective a treatment is.

-In a PET scan, a machine detects radiation that is emitted by a radiotracer. A radiotracer consists of radioactive material that is tagged to a natural chemical, such as glucose.

7 0
3 years ago
Read 2 more answers
Species a diverged from species b 60,000 years ago. On a particular gene, they have 15 nucleotide differences. How many nucleoti
a_sh-v [17]

The given question says that b species diverged around 60,000 year ago from species a. Since the divergence, they have a nucleotide difference of 15 nucleotide.

We need to find out the nucleotide difference in another 240,000 year, which means a total of 300,000 year since divergence.

The nucleotide difference in 60,000 years = 15 nucleotide.

The nucleotide difference in 1 year =\frac{15}{60,000}  nucleotide.

The nucleotide difference in 300,000 years = \frac{15}{60,000}\times 300,000 nucleotide.

The nucleotide difference in 300,000 years = 75 nucleotide.

Hence, after another 240,000 years or 300,000 years since divergence, the species and species b would show a difference of 75 nucleotide.

In another 240,000 years, there would be 60 nucleotide difference, as 15 of the nucleotide are already different in initial 60,000 years from the total of 75 nucleotide difference in 300,000 years. So, 60 (75-15) nucleotide difference would be observed in next 240,000 years.


4 0
3 years ago
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