Reference no: EM132326886
Mid term test
1. Complete the following statement:
(1) The major chemical process in the light reactions of photosynthesis involves the splitting of _____ and the release of _____.
(2) In the dark reactions of photosynthesis, _____ from the atmosphere is incorporated into organic molecules such as _____.
(3) In a neuron that is not conducting an impulse, there is an excess of _____ ions inside the cell and an excess of _____ ions just outside the cell membrane.
(4) An action potential is caused by a large number of _____ ions moving across the cell membrane toward the _____.
2. Explain the differences between chemical digestion and mechanical digestion.
3. What kinds of food molecules can supply precursors to the Krebs cycle.
4. Which can lead to health problems: vitamin deficiencies or vitamin megadoses?
5. What is a limiting nutrient? What are some examples of nutrients that can be limiting for the growth of plants? How can farmers supply limiting nutrients to plants?
6. Which of the following causes more cases of cancer: heredity, smoking, or viruses?
7. If the toxic dose of caffeine is about 16 g for a person weighing 80 kg (about 180 pounds), how many cups of coffee, consumed at one time, would it take to realize this dose?
8. Of the many drugs described in chapter 14, which causes the largest number of deaths from people under its influence?
9. If a drug is described as an opiate agonist, what does that mean?
Assignment 2
1. True or False
(i) Viruses contain either RNA or DNA as a genetic material.
(ii) Virus having an arthropod as vector or intermediate host is called arbovirus.
2. Select the correct pair.
(a) Acidic amino acid - Arginine
(b) Basic amino acid - Phenylalanine
(c) Alcoholic amino acid - Threonine
(d) Neutral amino acid - Cysteine
3. Which of the following is an example of polysaccharides?
(a) Sucrose (b) Maltose (c) Raf?nose (d) Cellulose
4. Select the correct statement regarding nucleic acids.
(a) These are long chain micromolecules formed by polymerisation of nucleotides.
(b) The backbone of a DNA strand is built up of deoxyribose and phosphoric acid groups.
(c) The two DNA chains are identical.
(d) RNA is Fuelgen positive.
5. The double stranded DNA has 15% of cytosine. The percentage of adenine in DNA will be:
(a) 35% (b) 30% (c) 45% (d) 70%.
6. A phosphoglyceride is always made up of :
(a) a saturated or unsaturated fatty acid esteri?ed to a glycerol molecule to which a phosphate group is also attached
(b) a saturated or unsaturated fatty acid esteri?ed to a phosphate group which is also attached to a glycerol molecule
(c) only a saturated fatty acid esteri?ed to a glycerol molecule to which a phosphate group is also attached
(d) only an unsaturated fatty acid esteri?ed to a glycerol molecule to which a phosphate group is also attached.
7. In India, we ?nd mangoes with different ?avours, colours, ?bre content, sugar content and even shelf-life. The large variation is on account of:
(a) species diversity (b) induced mutations
(c) genetic diversity (d) hybridisation.
8. Select the correct chronological order of the evolution of man.
(a) Australopithecus → Homo erectus → Homo habilis→sapiens
(b) Australopithecus →Homo habilis→ Homo erectus →sapiens
(c) sapiens → Australopithecus → Homo erectus → Homo habilis
(d) sapiens → Australopithecus → Homo habilis → Homo erectus
9. Essential Amino Acids.
10. Describe the mechanism of inheritance of ABO blood groups in humans.