Would high exposures to ionizing radiation (such as x-rays) be effective in making milk safe?
In: Biology
sickle-cell. What percent of offspring should have any sickle-cells? Enter only a whole number.
In: Biology
Explain in detail and with drawings, the actual mechanism of ATP synthase (the protein responsible for making ATP) and the use of proton pumps during oxidative phosphorylation and how that leads to the synthesis of ATP. ****See picture below
In: Biology
Briefly explain how the lagging strand is replicated. Include how the replication starts, the enzymes involved and the completion of the lagging strand replication
In: Biology
In: Biology
the paper "Unlikely Allies" by Amanda Keener. It was published in The Scientist, November 2016, page 32. The Scientist is a free-access publication which can be found at www.the-scientist.com.
a) Is the immune system friend or foe to the brain? What is your opinion after having read the assigned paper?
b) What is/are the role(s) of the immune system in the body?
c) What is the role(s) of memory T cells? What is the relation between them and CD4+? Maybe the figure on page 35 can help answer this question.
d) What is the role of the immune system in fighting neurodegenerative disease?
In: Biology
In: Biology
Explain why it is difficult to see dimly-lit objects when you look directly at them. How could this information be used to improve our vision at night?
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Draw and/or describe how the edges of objects are encoded in the primary visual cortex.
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Draw and/or describe the process of phototransduction from the molecular change in retinal to the change in ion flow through cGMP-gated ion channels. What would happen if a photoreceptor had a mutation that made the phosphodiesterase enzyme constantly active?
In: Biology
3. Name the three vessels that arise from the aortic arch. Describe the routes of arterial blood supply from these vessels to the head and neck, the brain, the thorax, and the upper limb.
4. Describe the pathways and the organs supplied by the midline arteries and by the paired arteries branching off the abdominal aorta.
5. Describe the pathway of arterial supply to the pelvis and the lower limb.
6. Identify the location of pulse points in the limbs, head, and neck.
7. Trace the veins that empty into the superior vena cava as you
describe the routes of
venous return from the brain, the head and neck, and the thorax and
upper limbs.
8. Trace the veins that empty into the inferior vena cava as you trace venous return from the abdominal organs and from the pelvis and lower limbs.
9. Describe the structure and specific function of the hepatic portal system, and explain the significance of portal-systemic anastomoses.
10. Define atherosclerosis, deep vein thrombosis, venous disease
of the lower limb,
aneurysm, microangiopathy of diabetes, and arteriovenous
malformation.
11. Trace the cardiovascular circuit in the fetus, and explain how it changes at birth.
12. List some effects of aging on the blood vessels.
In: Biology
If the oxidation of glucose can produce flames, as seen when roasting a marshmallow over a campfire, why don’t we risk internal burns when we swallow a marshmallow and oxidize its glucose with cellular respiration?
| Oxidation is not taking place. The marshmallow is being reduced. |
| The lining of our stomach prevents burning food from causing damage to our bodies |
| Digestion of the marshmallow is an endergonic process, therefore, no energy is released |
| Cellular respiration releases the energy from the glucose in
small increments, rather than all at once.
What does an enzyme change in a reaction?
|
In: Biology
predict the impact of small population size upon population genetics. also, explain the advantages of using large population
In: Biology
1. An isolated population of chimpanzees was discovered on an island. Biochemical studies show that 1 out of 9 chimpanzees in this population are homozygous for a mutation in the gene encoding the enzyme, hexokinase. This mutation completely inactivates the enzyme so that no activity is detected in the blood. A female who exhibits hexokinase activity mates with a male who is a carrier of the hexokinase mutation. What is the probability that their first baby chimpanzee will be homozygous for the hexokinase mutation? Assume that the population is in Hardy-Weinberg equilibrium.
2. Cystic fibrosis is an autosomal recessive, fully penetrant trait in humans. A man who is unaffected by cystic fibrosis has two unaffected parents and a sister with cystic fibrosis. The man plans to marry a healthy woman, who was adopted and has no knowledge about her biological parents except that they are both Caucasian. The frequency of cystic fibrosis in the Caucasian population is 1/2500. Assuming that this population is in Hardy-Weinberg equilibrium for the CF gene, what is the probability that this couple's first child will have cystic fibrosis?
In: Biology
How are developmental homeotic genes important to the process of evolution?
In: Biology