Why is cellulose so difficult for most animals to digest?
1. | they don’t have the proper enzyme to break the bonds between subunits |
2. | cellulose is made up of chitin, which is indigestible |
3. | the bonds holding cellulose subunits together are extremely strong, stronger than in any other macromolecule |
4. | there are many hydrogen bonds holding the subunits together |
Carbohydrates are commonly found as starch in plant storage organs. Which of the following five properties of starch (a-e) make it useful as a storage material?
(i). easily translocated
(ii). chemically non-reactive
(iii). easily digested by animals
(iv). osmotically inactive
(v). synthesized during photosynthesis
The useful properties are:
1. | (i), (ii) and (v) | 2. | (i) and (v) |
3. | (ii) and (iii) | 4. | (ii) and (iv) |