BIOLOGY MIDDLE SCHOOL

What is the only force acting upon an object in free fall

Answers

Answer 1
Answer: Gravity because it is pulling you down and making you descend or fall.
Answer 2
Answer: gravity is the only force by which an object in free fall is experiencing. There is only minimal resistance that is being felt.

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A student grouped animals into two separate groups based on a characteristic shared by all of the animals in each group. The two groups are shown below.What characteristic did the student most likely use to group the animals?
A.
presence or absence of lungs
B.
prokaryotic or eukaryotic
C.
autotrophic or heterotrophic
D.
presence or absence of backbone

Answers

D. presence or absence of a backbone

Answer:

D

Explanation:

All of the animals on the left are vertebrates, or in other words, they have a backbone. The animals on the right are invertebrates or without a backbone. Hope this helps!

Technological advances in transportation have come about in response to the depletion of fossil fuels and other negative aspects of the internal combustion engine. There are many positives to these advancements, but there are also some negatives. Which statement is a negative aspect of these advancements?A) These advancements use renewable resources like corn.
B) These advancements do not contribute to the greenhouse effect.
C) These advancements use cleaner fuels thereby reducing pollution.
D) These advancements are very expensive and not available to everyone.

Answers

Answer:

The correct option is D) These advancements are very expensive and not available to everyone.

Explanation:

Consider the statement A. It states that the new technological advances uses renewable sources of energy. This is a positive aspect as the energy can be renewed and replaced. The corn from which this energy is derived can be produced over and over again. Hence, this is a positive aspect, not a negative aspect.

Consider statement B. This statement tells us that the new technological advances will not result in warming the Earth's atmosphere by greenhouse effect. Hence, it is a positive aspect.

Consider statement C. It states that the new technological advances will lead to lesser pollution. Hence, it is a positive aspect.

Now, consider statement D. It is a drawback because technological advances are too expensive to be used by many people. Hence, it is a negative aspect.

Answer:

D) These advancements are very expensive and not available to everyone.

Explanation:

What do you think will happen to the cell and the organism over time if it can’t produce energy?

Answers

Cells that have no mitochondria are unable to convert oxygen into energy, found in the form of adenosine triphosphate (ATP). All multicellular eukaryotic organisms, including plants and animals, have mitochondria in some cells, but prokaryotes and some single-cell eukaryotes do not have mitochondria.

Final answer:

If a cell can't produce energy, it would be unable to perform vital processes, leading to its death. On an organism level, inability to produce energy in a significant number of cells can lead to system failures and potentially, premature death.

Explanation:

If a cell cannot produce energy, over time, it would not be able to carry out critical functions such as growth, repair, transportation of nutrients, and reproduction. This condition could lead to the cell's eventual death. In an organism, if a sufficient number of cells are unable to produce energy, it could lead to system failures and ultimately, premature death of the organism. This is because the working of an organism depends on the collective effort of its cells which require energy to function.

Learn more about Energy Production in Cells here:

brainly.com/question/36451848

#SPJ12

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

How can you describe the image formed by a convex mirror

Answers

ray diagrams were constructed in order to determine the location, size, orientation, and type of image formed by concave mirrors. The ray diagram constructed earlier for a convex mirror revealed that the image of the object was virtual, upright, reduced in size and located behind the mirror.

A true-breeding plant with yellow seeds is bred with a true-breeding plant with green seeds. What color seeds will the offspring produce where yellow is the dominant seed color?A.
all yellow

B.
all green

C.
three-fourths yellow and one-fourth green

D.
three-fourths green and one-fourth yellow

Answers

Answer:

The correct answer would be A. all yellow.

Let "Y" be the dominant allele and "y" be the recessive allele of the gene responsible for the color of the seeds.

Dominant allele "Y" codes for the yellow color of the seeds when present in homozygous as well as heterozygous condition whereas recessive allele "y" codes for the green color of the seeds only when present in homozygous condition.

Now, the genotype of a true-breeding plant with yellow seeds would be YY and that of a true-breeding plant with green seeds would be yy.

The gametes formed by yellow seed plant would be Y and gametes formed by green seed plant would be y.

The cross will result in the production of offspring each with genotype Yy.

Hence, all the offspring plants would produce yellow seeds as yellow is a dominant character.
A. all yellow

they will look all yellow but all will be heterozygous
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