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Ali Rajani

KCL Medic | Evidence based coaching

5274Students helped
17Questions answered
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Chemistry

Asked by Noor · a year ago

What is a dynamic equilibrium?

Dynamic equilibriums occur for reversible reactions. They happen when sufficient product is formed that the rate of the reverse reaction becomes as great as the rate of the forward reaction. The result is zero net change in product and reactant concentrations. In a dynamic equilibrium: 1. The rate of forward reaction = Rate of backward reaction 2. The concentration of products and reactants re... more

Biology

Asked by Jeniffer · a year ago

What is the hepatic portal system?

From an evolutionary standpoint, it would be advantageous for us to process the toxins in our food before we let them enter our systemic (full body) circulation. The hepatic portal system is a system whereby the venous blood of the gastrointestinal tract is mixed with the arterial supply (hepatic artery) entering the liver. This portal system blood is both relatively oxygenated and contains the... more

Biology

Asked by Audrey · a year ago

Is there ever a hole or passageway between the two atria of the heart? Why or why not?

During embryonic development of the heart, there is a hole in between the atria known as the foramen ovale. Why? Because during early development, the lungs aren’t fully developed - instead the fetus receives oxygenated blood from the placenta via the right atrium. This oxygenated blood needs to bypass the pulmonary circulation which is not ready to work yet. A hole between the atria (foramen ova... more

Biology

Asked by Ellie · a year ago

Do the cells in an asexual reproduction divide by mitosis or meiosi?

Asexual reproduction happens via mitosis. Why? Asexual reproduction implies that the organism does not combine its genetic material with that of another organism - It is a (“without”) - sexual (“fusion of gametes”). This means that for it to have offspring, it simply has to clone its own cells, much like in tissue repair. There is no need for genetic variability in offspring because we want to... more

Biology

Asked by Xxaldidxx · a year ago

What is photosynthesis?

All the answers above are A1. So instead, I'll give you the bigger picture. Photosynthesis means to "produce" (synthesis) from "light" (photo). This string of words is not very accurate at first. Let's put this into perspective: As humans, we respire - This means we react our food (glucose) with the oxygen we inhale. This reaction is exothermic; less energy is used in starting the reaction than... more

Biology

Asked by Richard · a year ago

What are the events which lead to the formation of (a) identical twins, and (b) fraternal twins?

Identical twins: One sperm fertilises one egg. The fertilised egg grows and divides to form a zygote (bundle of cells). The zygote splits into two smaller zygotes. These two smaller zygotes each share identical DNA and grow to form two separate humans with the same set of genetic material. Fraternal twins: Two separate eggs get fertilised by two separate sperm at the same time. This forms two z... more

Biology

Asked by Max · a year ago

What are the twenty major bones in the body?

1. Carpals 2. Clavicle 3. Cranium 4. Femur 5. Fibula. 6. Humerus 7. Mandible 8. Metacarpals 9. Metatarsal 10. Patella 11. Pelvis 12. Phalanges (fingers) 13. Phalanges (toes) 14. Radius 15. Ribs 16. Sternum 17. Tarsal 18. Tibia 19. Ulna 20. Vertebrae (Cervical/Lumbar/Thoracic/Sacral/Coccygeal)

Biology

Asked by Lian · a year ago

The Km of a Michaelis Menten enzyme for a substrate is 1*10^-4M. At substrate conc. of 0.2M vo=43uM/min for a certain enzyme concentration. However with a substrate conc. of 0.02, vo has the same value. Show that this observation is accurate?

Michaelis-Menten Expression (MME): V0= Vmax*[S] / (Km + [S]) ——————————————————— We know regardless of [S], Km= 1x10^-4 for this enzyme. Observation A ([S] = 0.2M), MME: 4.3x10^4 = 0.2*Vmax_a / (1x10^-4 + 0.2) Observation B ([S] = 0.02M), MME: 4.3x10^4 = 0.02*Vmax_b / (1x10^-4 + 0.02) ——————————————————— Therefore: 0.2*Vmax_a / (1x10^-4 + 0.2) = 0.02*Vmax_b / (1x10^-4 + 0.02) If you simp... more

Biology

Asked by Phoebe-Lily · a year ago

Why is eating a healthy, balanced diet so important to the body?

I’ll keep it short. 1. You need to satisfy your vitamin, mineral and fat requirements. Without these components, your body can not function adequately (Many enzymes derive essential components in dietary vitamins and minerals. Fat is essential to make lipid based hormones). A disease caused by the lack of something is known as a “deficiency” disease. 2. What you eat can determine your mood. E.g.... more

Maths

Asked by Sophié · a year ago

How do I find the point of contact of a tangent to a curve or circle?

Rearrange the equation for the straight line to the form: ax+b=y and substitute this result for y into the equation for the circle (x-c)^2+(y-d)^2=e and you can rearrange to get a quadratic in x. Solve the quadratic. Since the line is a tangent to the circle, there will only be one repeated solution, which gives the x coordinate you are after. Substitute back into the equation of the line to find... more

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Ali Rajani

KCL Medic | Evidence based coaching

5274Students helped
17Questions answered
£1Per hour