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Ganezh [65]
3 years ago
9

Which one of the following discoveries involving DNA happened first? A) Avery discovered that DNA was responsible for storing an

d passing information through generations. B) sequencING an entire human genome was completed.C) griffith learned that a chemical changed harmless cells into harmful cells. D)Hershey and chase used bacteriophages to confirm that DNA was the genetic material in genes
Biology
2 answers:
Nataliya [291]3 years ago
7 0
It is either a or b not sure but i think its mostly a
marissa [1.9K]3 years ago
6 0
From the given options, the following sidovery involving DNA happened first: C) Griffith learned that a chemical changed harmless cells into harmful cells. 
The British medical officer named Frederick Griffith discovered DNA in 1928 while conducting experiments using Streptococcus pneumoniae bacteria and mice. 
<span>He concluded that the living R bacteria had been transformed into pathogenic S bacteria by an unknown, heritable substance from the dead S cells that allowed the R cells to make capsules.</span>
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which autonomic system conserves energy by returning the body to a normal activity level through a lowered heart rate and blood
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The parasympathetic nervous system <span>conserves energy as it slows down heart rate, increases intestinal and glandular activity, and relaxes the sphincter muscles of the gastrointestinal tract. It gets the nickname "rest and digest" for doing exactly so. Typically most active when sleeping, however is also the explanation for post-prandial fatigue, or being tired after eating (especially a large meal).</span>
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3 years ago
The feeding tube inserted in the man’s nose is necessary for him to survive. It delivers food to him each day, but his mass is n
Maru [420]

Answer:

i have to make a model?

Explanation:

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3 years ago
A protein channel in a hydrogen ion pump is shown below. What would happen if the concentration of H+ ions were higher inside th
inessss [21]

Answer:

The H+ ions moves outside.

Explanation:

The H+ ions moves outside the mitochondria of the cell if the concentration of H ions were higher inside the mitochondrion than outside environment of the mitochondrion in order to equalize the pH or H+ ions concentration of both inner side of mitochondria and outer side environment. This movement of H+ ions from a region of higher concentration to the region of lower through a semi-permeable membrane is known as osmosis which has a positive effect on the cell as well as organelles of the cell.

5 0
3 years ago
Which statement best describes a physical change?
vovikov84 [41]

Answer:

Both the identity and the properties of a substance change

Explanation:

I got it right

5 0
4 years ago
Write down the clinical findings which are least suggestive of left-sided heart failure?
Arada [10]

Answer:

Adverse heart conditions do not occur in isolation. It is usually accompanied by other risk factors, like coronary artery dysfunction, diabetes, high blood pressure, etc.    

In addition to the above, the following factors are indicative of left-sided heart failure:

  • Shortness of breath caused by the collection of fluid in the lungs. Shortness of breath usually becomes pronounced upon physical exertion
  • An increase in the girth of the torso (mainly the abdomen) due to ascites which is the buildup of fluid in the abdomen.
  • engorged scrotum (in males of course)

Explanation:

Left-Sided Heart Failure is simply the inability of the heart to pump oxygen-rich blood into the body.

Blood filled with oxygen is moved from the lungs to the atrium on the left and then to the left ventricle. The blood is then pumped from the ventricle on the left to other parts of the body by a contracting and relaxing action. Left-sided heart failure can be classified into two:

  1. Systolic Failure and
  2. Diastolic Failure

1. Systolic Dysfunction: When the left ventricle can no longer shrink properly, the pressure with which the heart can pump enough blood into circulation is reduced.

2. Diastolic Dysfunction: This occurs when the left ventricle can no longer relax as it ought to due to the hardening of the muscle.

Cheers

7 0
3 years ago
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