Question

34.

Why do children under 6 months of age, in developing countries, rarely suffer from malnutrition?

Children do not require as many different nutrients at that young age. They have adequate food from their family's farm during this period of their life. They are breast fed, and their mother's milk provides all required nutrition. They have not been alive long enough for malnourishment to occur. Most cultures in developing countries have the custom of providing scarce food to infants before other family members eat.

35.	Peptidoglycan cell walls are found in
	all cells. plant cells. animal and plant cells. animal cells. bacterial cells.

36.

Susie receives a beautiful bouquet of flowers. The flowers come with a packet of "stay fresh" which is a combination of sugars and electrolytes. The package says to add one packet to 2 liters of water. Susie pulls out her favorite vase. It happens to be a one liter vase. Susie did not bother to read the details on the package of "stay fresh". She puts the contents of the packet into the vase and fills it about 2/3 of the way before adding her flowers. Predict the effect of Susie's actions on her flowers.

The flowers will stay fresh about 2x as long since she used twice the amount of "stay fresh" The solution Susie created is hypotonic to the plant cells The flowers will wilt within a short time as water leaves the cells of the plant and is not replaced by water entering from vase. The solution Susie created is isotonic to the plant cells The sugars and electrolytes in "Stay fresh" will keep the flower fresher than without the "stay fresh"

37.	According to the cell theory, all living organisms are composed of
	macromolecules. DNA. proteins. phospholipids. cells.

38.	Mitochondria are found in
	bacterial cells. animal cells. plant cells. all cells. animal and plant cells.

39.	A cell membrane is composed of
	cell wall material. a layer of lipids. a double layer of phospholipids with proteins embedded in it. proteins. a double layer of phospholipids.

40.	All of the following describe transport proteins EXCEPT
	they are necessary to help all types of molecules to pass across the cell membrane. there are hundreds of types in the human body. they allow medium sized molecules like glucose and amino acids to pass across the cell membrane. they are very specific in the type of molecule they transfer. they are embedded in the cell membrane.

Answer 1

34. They are breast fed, and their mothers milk provides all required nutrition.

Mother's milk is packed with all essential nutrition. They completely rely on mother's milk.It also provides some sort of passive immunity to the child.

35. Bacterial cells.

Peptidoglycan is found in bacteria. It is a polymer composed of N acetylglucoseamine and N acetylmuramicacid.

Gram staining depends on the thickness of peptidoglycan layer.

36. The flowers will wilt with in a short time as water leaves the cell of the plant and is not replaced by water entering from vase.

Solution will be hypertonic to the plant. So water will leave the plant cells.

37. Cells

According to cell theory all living organisms are composed of cells. Cell is the unit of life.

38. Animals and plant cells.

Prokaryotes dose not have mitochondria.

39. A double layer of phospholipid with proteins embedded in it.

40. They are necessary to help all types of molecules to pass across the cell membrane.

Gases like CO2 and O2 can pass cell membrane directly. They don't require a transport protein.