Answer:
Asexual reproduction in starfish. Asexual reproduction in starfish takes place by fission or through autotomy of arms. In fission, the central disc breaks into two pieces and each portion then regenerates the missing parts.
Explanation:
The direction that an ocean current travels can be altered by the movement of the Earth's rotation on its axis. This is known as the Coriolis effect.
<h3>What is Coriolis effect in simple terms?</h3>
Coriolis effect is the result of Earth's rotation on weather patterns and ocean currents. The Coriolis effect makes storms swirl in the clockwise direction in the Southern hemisphere while on the other hand, storms counterclockwise in the Northern Hemisphere. This effect can cause change in the direction of the ocean current due to the rotation on its axis.
So we can conclude that the direction that an ocean current travels can be altered by the movement of the Earth's rotation on its axis. This is known as the Coriolis effect.
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Answer:
B) hypertension and bradycardia.
Explanation:
Autonomic dysreflexia is a syndrome which is characterised by the sudden rise in the blood pressure of the human. The disease is common in the people with a higher level of spinal cord injuries above the T6 level.
The condition occurs when some external stimuli like pain or irritant activate the involuntary response in the body which cause the blood pressure to rise (hypertension). This leads to the slowdown of the heartbeat (bradycardia) to restore the blood pressure but the body cannot restore the blood pressure due to the damage in the spinal cord.
Thus, Option-B is the correct answer.
Yes. Absolutely. Without heart, no one can live. It helps in pumping of oxygen rich blood to all body cells and tissues. It also helps in transportation of various materials like potassium, sodium, calcium etc. in our body. The main function is that it helps in excretion of wastes.
Since blood is liquid and heart pumps it, the waste materials like CO2, gets diffused and becomes impure blood. Then it is taken to lungs for purification and again reused.
So, heart actually helps us indirectly in many ways.
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Answer:
E. Erwin Chargaff >> Discovered that there were equal amounts of the nitrogen bases A T and C G in a human body cell; concluded that A paired with T and C paired with G
B. Hershey and Chase>> Did experiments with viruses to determine that DNA, not protein, is the genetic material of a cell
A. Frederick Griffith>> Did experiments with S and R strain pneumonia bacteria to determine that DNA is the genetic material of a cell
C. Rosalind Franklin >> Took x-ray crystallography images of a DNA molecule.
Explanation:
Chargaff rules helped to determine the double helix structure of the Deoxyribonucleic acid (DNA), i.e., the genetic material of prokaryotic and eukaryotic organisms. Chargaff indicated that DNA from any species contains a 1:1 ratio of purine bases (Adenine and Guanine) and pyrimidine bases (Cytosine and Thymine). Hershey and Chase provided evidence that the DNA, instead of protein, is the hereditary material. Hershey and Chase used radioactive phosphorus-32 in order to label the DNA of specific bacteriophages (T2), and they discovered that the DNA was responsible to generate progeny inside infected bacteria (i.e., DNA was hereditary material). Frederick Griffith observed that DNA molecule was the transforming factor that could be transferred to innocuous <em>Streptococcus pneumoniae</em> bacteria in order to convert them into deadly bacteria. Finally, Rosalind Franklin obtained the first X-ray image that showed the diffraction pattern of a crystallized DNA molecule, which was used by Watson and Crick to propose that DNA had a double helix structure.
