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tia_tia [17]
3 years ago
12

When not enough oxygen is available to cells during rigorous exercise, muscle cells must convert pyruvate to __________ to gener

ate additional ATP.
A) lactic acid
B) NAD+
C) oxygen
D) glucose
Biology
1 answer:
Kipish [7]3 years ago
3 0

The correct answer is: A) lactic acid.

During the exercise, muscle cells use anaerobic respiration in order to make enough energy in the form of ATP. Anaerobic respiration doesn’t require oxygen, but glucose is broken down to produce energy. Glucose is broken down to pyruvate in the process called glycolysis. Next step is convert of pyruvate into lactic acid (or lactate).

During the exercise, the oxygen level in muscle cells decreases, which results in anaerobic respiration of the cells.


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Birds and mammals have a four-chambered heart, but most reptiles have a three-chambered heart. How does this fact affect the con
eduard

Answer:

The animals present body structure is due to evolution. It is seen in each part including the structure of the heart. The vertebrate heart becomes complex from a simpler form.  

Invertebrates, the heart of fishes is two-chambered having one auricle and one ventricle. The deoxygenated blood gets purified in the gills. They are aquatic and no lungs for breathing. The hearts pump a mixture of oxygenated and deoxygenated blood to the body.  

The amphibians and reptiles have 3 chambered heart as they lead terrestrial mode of life. The gills modified into the lungs.  The left auricle receives pure blood and the right auricle receives deoxygenated blood. The blood purified in the lungs and in the ventricle, both types of blood get a mix. The ventricle pumps the mixed-blood throughout the body.

In the case of birds and mammal, the heart is 4 chambered and the oxygenated and deoxygenated blood are separated. These two are higher vertebrates. No mix of pure and impure blood, the body receives only the oxygenated blood.

This shows to construct the phylogenetic tree of vertebrates - the fishes should be in the bottom, and above it amphibians, reptiles, then, mammals and birds on the top branch of the tree. As the chambers and structure of the hearts modified one after another.

6 0
3 years ago
Practice 1
iren [92.7K]

Answer:

  1. Organ
  2. Organ
  3. S
  4. Cell
  5. Whole organism
  6. S
  7. Organ
  8. Cell
  9. S
  10. Whole organism
  11. Cell

5 0
3 years ago
A bacterium that you isolated from pond water appears to use light for energy. Based upon this information, you inoculate the or
FinnZ [79.3K]

The question is incomplete as it does not have the options which are:

  • there was no sulfur compound added to the medium, that could be used as an electron donor.
  • no oxygen was added to the medium so the organism died.
  • there is some inhibitory chemical that is preventing the growth of the bacterium.
  • you were using the wrong type of sunlight as the energy source for the bacterium.

Answer:

There was no sulfur compound added to the medium, that could be used as an electron donor.

Explanation:

In the given question, the bacteria which are found in the pond uses light energy to use carbon dioxide and form the glucose molecule. These bacteria are known as phototrophic bacteria.

The process of photosynthesis requires an electron donor and an electron acceptor to use molecule.

The organism when provided the light and carbon dioxide artificially in a culture, the bacteria were not able to grow. The reason for this could be accounted as that there was no electron donor found in the media like sulfur which could donate the electron during the chain reaction.

Thus, the selected option is correct.

4 0
3 years ago
Junko's grandmother survived a stroke but is paralyzed on her left side. she has likely suffered damage to her ____.
Sergeu [11.5K]

The paralysis of the body is caused by the presence of lesion due to damage to the structures of the brain. the paralysis occurs on the contralateral side of the damaged structure. This means if the damage occurs in the left hemisphere of the brain, then the right side of the body would be damaged, and if the right hemisphere of the brain is damaged, it causes the paralysis of the left side of the brain.

In this case, the patient's left side is paralyzed, so, the lesion should be present in her right hemisphere.

Hence, the given blank can be filled with right hemisphere.

5 0
3 years ago
How many hydrogen bonds exist between this DNA strand and its complimentary strand? TCCAAG
podryga [215]
Hydrogen bonds exists between the DNA strand and its complementary strand such that; there are two hydrogen bonds between every A and T, and three between every C and G.
 Therefore; in this case there will be (2 ×3 ) +(3×3) = 15 hydrogen bonds for the above strand. this is because Adenine binds to Thyamine with two bonds (3 pairs) and Guanine binds to Cytosine with three bonds (3 pairs).
8 0
3 years ago
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