What Is Life? A Guide to Biology
4th Edition
ISBN: 9781319065454
Author: Jay Phelan
Publisher: W.H. Freeman & Co
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Chapter 23, Problem 7SA
Summary Introduction
To review:
The four phases used by humans to extract nutrients from food, and the major activities occurring in each step.
Introduction:
Humans obtain nutrients from food in four steps – ingestion, digestion, absorption and elimination.
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What three classes of nutrients are most abundant? Whatare the end products of enzymatic digestion of each?
Enumerate at least three (3) importance of nutrients.
Differentiate macronutrients and micronutrients. Provide three (3) examples of each.
Provide a chemical test to detect the presence of the following:
a.) carbohydrates
b.) proteins
c.) fats
d.) calcium
All of the following are correct about the term "essential nutrient" except:
1) there are about 40 nutrients known to be essential.
2) these nutrients must be obtained from food.
3) water is a nonessential nutrient.
4) carbohydrates are nonessential.
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What Is Life? A Guide to Biology
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- What are different modes of nutrition found in organisms? List them.arrow_forwardWhat best describes iron nutrition in vegetarians? a) More iron deficiency is found in vegetarians than in people eating a mixed diet. b) The absorption of iron is low due to the high vitamin C intake. c) Iron utilization is inhibited by the high zinc content in grains. d) The iron RDA for vegetarians is higher than for others.arrow_forwardExplain some Essential Nutrients and Where They Can Be Obtained?arrow_forward
- a) What are the advantages of storing food as fat rather than carb or protein? b) What is the formal definition of an “essential nutrient” in one’s diet? c) How can you eat whole foods as a “vegan” (which many animals do!) and get all the essential amino acids without eating anything related to animals and not by taking supplements/pills d) What is the difference between a vitamin and a mineral?arrow_forwardList the six classes of nutrients, explaining thesignificance of each.arrow_forwardWhich of the following is true about essential nutrients? A) Essential nutrients are substances that are not required by the body B) Essential nutrients are substances that can be synthesized readily and adequately by the body C) Water,linolenic acids are nutrients that are not essential D) Vitamins are a group of essential nutrients required in small amountsarrow_forward
- Which of the following words is missing in the following sentence: If you suck on a piece of bread, it will start to taste sweet after a while. This is because saliva contains the degrading enzyme ____________ which breaks down starch into ___________________. a) amylase; glucose b) amylase; maltos c) pepsin; maltos d) maltas; glucosearrow_forwarddescribe how each major class of nutrients is chemicallydigested, name the enzymes involved, and discuss thefunctional differences among these enzymes; andarrow_forwardWhat are primary nutrients? Give some examples?arrow_forward
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