BIOLOGY MIDDLE SCHOOL

Student measures the mass of a paper clip. The students data table is shown below. The acceptable value for the paper clips is 1.14g.Trial # Mass
1 2.45 g
2 2.40 g
3 2.42 g

which of the following best describes the students measurements

the students measurements were accurate, but not precise

the students measurements were precise, but not accurate

the measurements are neither accurate nor precise

the measurements are both accurate and precise

Answers

Answer 1
Answer:

Answer:

Option , B, the students measurements were precise, but not accurate

Explanation:

It is given that the acceptable value for the paper clips is 1.14 grams.

An accurate value is the one which is close enough to the accurate answer and in case when the number of readings taken with in an experiment are close to each other then they are said to be precise.

Here the value obtained through three reading are close to each other hence, they are precise but none of these values is close to the acceptable value for the paper clips.

Hence, option B is correct.
Answer 2
Answer: I believe the correct response is that the student measurements were precise but not accurate.

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Stete one loss of biodiversity in an ecosystem

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Habitat destruction... Hope helps

Answer:

Forest fires

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Reproduction produses offspring by combining the genetic information from 2 parents a. Asexual
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The answer to this question is A. Asexual
The Answer is A........

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Answer:Arctic Ocean

Explanation:

5. What molecule is essential to regenerate at the end of the Krebs cycle to start the process again?A. Water
B. Pyruvate
C. Oxaloacetate
D. Ammonia

Answers

Answer: Oxaloacetate

Explanation: The krebs cycle starts with the pyruvic acid that is obtained after glycolysis. The Kreb's cycle begins when the Acetyl coA combines with a four molecule oxaloacetate.

The main product formed is citric acid thats why the cycle is also called as citric acid cycle. After the citric acid is formed it goes through a series of reactions to form NADH, FADH2 and ATP.

The carbon dioxide is also released during this process. The oxaloacetate formed is used to start the cycle so its is regenerated again and again.

Oxaloacetate is the molecule that is essential to regenerate at the end of the Kreb's cycle to start the process again.

Further Explanation;

Cellular respiration;

  • Cellular respiration is the process by which living organisms use nutrients or food substances to generate energy in the form of ATP that is required to drive cellular processes.
  • Cellular respiration takes place in three stages; glycolysis, Kreb's cycle and electron transport.

Glycolysis

  • It is the first stage of aerobic respiration where an organic molecule such as glucose is broken down to form 2 molecules of Acetyl-CoA and net production of 2 ATP molecules.
  • Each glucose molecule yields two molecules of ATP and two molecules of Acetyl-CoA.
  • During the process of glycolysis 2 molecules of energy carrier, NADH which are then taken to energy transport chain to produce more ATP.

Kreb's cycle

  • It is the second phase of aerobic respiration that involves a series of reactions catalyzed by various enzymes.
  • Acetyl-CoA from glycolysis undergoes a series of reaction to produce six molecules of NADH, two molecules of FADH2, together with carbon dioxide and two molecules of ATP.
  • During Kreb's cycle Acetyl-CoA is converted to Citrate to Isocitrate to alpha-ketoglutarate to Succinyl-CoA to Succinate to Fumarate to malate and lastly to Oxaloacetate.
  • Oxaloacetate is the final molecule formed during the TCA cycle and is essential to enhance the start of Kreb's cycle once more.

Electron transport chain

  • It is the final stage of Aerobic respiration, where the six molecules of NADH and two molecules of FADH2 from Kreb's cycle and 2 NADH molecules from glycolysis are used to generate more energy in the form of ATP.
  • This stage generates 34 molecules of ATP.  
  • Keywords: Cellular respiration, energy carriers, energy in the form of ATP, use of energy carriers from glycolysis and citric acid cycle to generate more ATP.

Learn more about:

Level: High school

Subject: Biology

Topic: Cellular respiration

Sub-topic: Kreb's cycle

Most of the worldwide human population is growing exponentially because? A. Human populations have not reached there exponential curve
B. Human populations have not yet completed the demographic transition
C. Human populations do not conform to the logistic model
D. Science and technology have made it possible

Answers

Most of the worldwide human population is growing exponentially because B. Human populations have not yet completed the demographic transition.

It should the exponential growth means that the population is just experiencing the first stage of the demographic transition.

Most of the worldwide human population is not growing exponentially due to science and technology.  The fact that human populations have not yet completed the demographic transition is the main reason for the exponentialgrowth.

Read related link on:

brainly.com/question/15633944

Explanation:

B. Human populations have not yet completed the demographic transition

Human populations may experience several stages of development, which can be measured through rates of birth and death. This model,  demographic transition measures population changes over time.

During the initial stages of the demographic transition, populations experience high death rates and high birth rates. Successive stages involve steadily increasing birth rates, falling death rates and later, low birth and death rates. At the final stage, the birth rates experience a  stark decline.

Thus, the exponential growth means that the  population is just experiencing the first stage of the demographic transition.

Learn more about population growth at brainly.com/question/8690489

#LearnWithBrainly

What was Fredrick miescher contribution to the discovery of the genetic code

Answers

Answer:

He discovered the cell nucleus and realized that inside the nucleus there was an unknown chemical substance. That substance was DNA.

Explanation:

Who discovered the DNA was Friedrich Miescher, a Swiss biochemist with great talent. Miescher, using substance precipitation techniques, such as pH changes in the medium, was able to discover and isolate the cell nucleus. Inside the nucleus he was able to isolate a previously unknown substance. It was the nucleic acid, DNA, which, at the moment, with the technology available until then, presented itself only as a white, flocculent precipitate, which Miescher would later call nuclein.

In 1869, Friedrich Miescher isolated "nuclein," DNA with associated proteins, from cell nuclei. He was the first to identify DNA as a distinct molecule. Phoebus Levene was an organic chemist in the early 1900's. He is perhaps best known for his incorrect tetranucleotide hypothesis of DNA.                                

To sum it up the answer is yes.
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