QUESTION 5

1. Which of the following statements best describes how the body digests foods with lots of starch?

   		Eating raw foods low in starch provides lots of energy as the body has to work harder to digest the food
   		Eating cooked foods high in starch provides little energy as the body has to work harder to digest the food
   		Eating cooked foods low in starch provides lots of energy as the body has to work harder to digest the food
   		Eating raw foods high in starch provides little energy as the body has to work harder to digest the food

2 points   

QUESTION 6

1. Why are polysaccharides known as “slow-releasing” sugars?

   		They are made up of long chains of monosaccharides
   		They slowly release energy over long periods of time
   		They are stored energy that must be converted to usable energy when needed
   		They are complex, large molecule sugars

2 points   

QUESTION 7

1. What are the health benefits of whole grains?

   		They have fiber, vitamins, and minerals other low-quality carb foods do not have.
   		Foods with whole grains in them are always low calorie.
   		People who eat them are guaranteed to lose weight.
   		Whole grain foods have fewer total carbohydrates compared to other foods.

2 points   

QUESTION 8

1. With the exception of extreme starvation, our brain relies completely on _________ as its energy source.

   		lipids
   		glucose
   		proteins
   		carbohydrates
   		vitamins and minerals

2 points   

QUESTION 9

1. Pectin, gums, cellulose, hemicellulose, and lignin are examples of___

   		starches
   		disaccharides
   		dietary fibers
   		complex and simple saccharides

2 points   

QUESTION 10

1. In a healthy person, when glucose levels are too high in the blood stream __________ is released. When glucose levels are too low ___________ is released.

   		amylase; insulin
   		insulin; amylase
   		glucagon; insulin
   		insulin; glucagon

2 points   

QUESTION 11

1. ________ is composed of glucose and fructose. This disaccharide is commonly known as table sugar.

   		lactose
   		fructose
   		maltose
   		sucrose
   		glucose

2 points   

QUESTION 12

1. When blood glucose levels are too low, a person might feel fatigued, irritable, and/or confused. Why is this?

   		Cells primarily use glucose as an energy source but most also can use fats or protein.
   		Glucose is used by all cells for energy, but exclusively by brain and nerve cells.
   		Glycogen is stored within liver and muscle tissue and can be released when needed.
   		Any of the monosaccharides can be used to meet the energy needs of the cells.

2 points   

QUESTION 13

1. High fructose corn syrup is a popular manufactured product which provides artificial _________ to a variety of processed foods we eat.

   		sweetness
   		calories
   		intelligence
   		nutrient-density
   		preservative

2 points   

QUESTION 14

1. According to the US Department of Health and Human Services (HHS), what are the risk factors we can (typically) control to reduce the risk of cardiovascular disease?

   		High blood pressure, high cholesterol, cigarette smoking, diabetes (Type 2), poor diet, physical inactivity, overweight and obesity.
   		Cigarette smoking, poor diet.
   		High blood pressure, cigarette smoking, diabetes, poor diet, physical inactivity.
   		Cigarette smoking, poor diet, physical inactivity.

2 points   

QUESTION 15

1. What is hydrogenation?

   		When a chemical molecule is changed by adding water molecules.
   		The process of taking a chemical and changing it by emulsifying the fat.
   		Taking an unhealthy saturated fatty acid and modifying it so that it provides more health benefits.
   		The process of adding hydrogen to unsaturated fatty acids resulting in a more saturated fatty acid

How is water taken up by roots and transported throughout a plant? What are the pathways and mechanisms used?

Explain how water is taken up by the plant roots and transported throughout the plant. Show the pathways and explain the mechanisms used to reach all parts of the plant.

The development of Biotechnology techniques has been a major focus of Biological research during the last part of the 20th century and the beginning of the 21st century. Select a technique associated with this technology and discuss the ethical issues associated with its practice. Be sure to discuss both the pros and cons of your choice. Please explain in a full paragraph.

1. Compare and contrast the distribution of the following plant tissues as they relate to mesomorphic, xeromorphic and hydromorphic leaves:

(a)     palisade and spongy mesophyll cells

(b)     vascular bundles

(c)     stomata

The pH of blood is maintained by a buffering system, consisting predominately by hydrogen carbonate ions, HCO₃^-, in equilibrium with carbonic acid, H₂CO₃, which decomposes completely to CO₂ and H₂O.

H₃O⁺ + HCO₃^- ⇌ 2H₂O + CO₂

Questions

1. During exercise, CO₂ is produced at a rapid rate in muscle.

How does exercising affect the pH of blood? Give a reason for your answer.

2. Hyperventilation (rapid and deep breathing) can occur during intense exercise.

How does hyperventilation affect the pH of the blood? Give a reason for your answer.

3. The normal first aid treatment for hyperventilation is to have the patient breathe in and out of a paper bag.

Explain briefly why this treatment works and what effect the paper bag treatment has on the pH of the blood.

Can you give me an example for competition , mutualism, cooperation, altruism, exploitation and the competitive exclusion principle?

To what does the term ‘Green Revolution’ refer? Using your knowledge of gibberellin biosynthesis and perception, discuss how this hormone has been shown to be the key to the semi-dwarfed nature of the plants of the ‘Green Revolution’.

Why is crossing over important to Forensic Biology?

Why is independent assortment important in Forensic Biology?

At the middle year 2020 ，there is an outbreak that causes patients to have fever，cough ，and breath difficulty. Discuss how methods in DNA recombinant technology can be applied to identify X virus that causes the recent outbreak. Based on a flowchart, explain steps involved accordingly and in details. (10marks)

What physical and chemical processes allow for the structural organisation of cellulose in the plant cell wall? Discussing examples where an understanding of cellulose organisation has practical and economic implications, explain how cellulose organisation is important for the plant.

1.(a)Explain how biodiversity determine the function of ecosystems.
(b)How are natural communities structured.

Huntington's Disease is caused by a dominant gene. The symptoms do not appear until middle age( age 40-45). There is a gradual degeneration of the nervous system which leads initially to muscle tremors. Death usually occurs within 10-15 years after the appearance of the initial symptoms due to deterioration of the nervous system.

As the human genome is typed, more and more tests are available to determine if a person carries a gene like this one for which there is no treatment or cure.

Using the information above, respond to the questions below.

a. If your family(Mother or Father) had a history of a genetic disorder like this one, would you choose to get tested for it? Why or why not?

b. Would the results of the tests influence your decision to have children? Explain.

c. Besides yourself, whom would you want to have access to the test results? Explain.

d. Who should not have access? Why not?