Description : What poisonous substances naturally produced by bacteria plants snakes insects and other living organisms?
Last Answer : what provides the best protection against gamma rays
Description : What is an antibiotic? (1) A chemical compound produced by a living organism that inhibits the growth of other organisms (2) Acompound synthesised by a living organism that inhibits the ... compound inhibiting the growth of other organisms (4) Asynthetic compound inhibiting the growth of bacteria
Last Answer : (4) Asynthetic compound inhibiting the growth of bacteria Explanation: Antibiotics, also known as antimicrobial drugs, are drugs that fight infections caused by bacteria. Alexander Fleming discovered the ... (not produced by microorganisms) that can also kill or inhibit the growth of microbes.
Description : In the light of recent classification of living organisms into three domains of life (bacteria, archaea and eukarya), which one of the following statements is true about archaea? (a) Archaea ... respects. (d) Archaea have some novel features that are absent in other prokaryotes and eukaryotes.
Last Answer : (d) Archaea have some novel features that are absent in other prokaryotes and eukaryote
Description : The term antibiotic was coined by _________to refer to antimicrobial substances naturally derived from _______. a. Waksman; bacteria and fungi b. Domagk; other living organisms c. Fleming; fungi and bacteria d. Ehrlich; bacteria
Last Answer : c. Fleming; fungi and bacteria
Description : What is an antibiotic ? (1) A chemical compound produced by a living organism that inhibits the growth of other organisms (2) A compound synthesised by a living organism that inhibits the ... compound inhibiting the growth of other organisms (4) A synthetic compound inhibiting the growth of bacteria
Last Answer : A synthetic compound inhibiting the growth of bacteria
Description : Lichen is considered to be a symbiotic association of two living organisms. Which organisms are involved in it? (a) Algae and bacteria (b) Algae and fungi (c) Algae and bryophytes (d) Fungi and bryophytes
Last Answer : Ans:(b)
Description : All membranes of free-living organisms have phospholipid bilayers, but exception is A- bacteria B- fungi C- archaea D- protozoa
Last Answer : archaea
Description : Which one of the following is not an organizational property common to all living organisms? a. Genetic organization b. Metabolic organization c. Compartmentation d. A cell nucleus
Last Answer : d. A cell nucleus
Description : The following organisms have been proposed as sources of single cell protein a. Bacteria b. Yeasts c. Algae d. All the three
Last Answer : Ans: D
Description : Gram negative organisms are largely insensitive to benzyl penicillin because (a) They produce large quantities of penicillinase (b) They do not utilize D-alanine whose incorporation in the cell wall is ... lipoprotein-peptidoglycan multiplayer cell wall of gram-negative bacteria (d) Both (a) and (b)
Last Answer : Ans: C
Description : An antibiotic is - (1) achemical synthesized by a human cell against a microorganism (2) a chemical synthesised by amicro-organism against another micro-organisms (3) a substance produced by blood cells against bacteria (4) a substance produced by blood cells against infection.
Last Answer : (2) a chemical synthesised by amicro-organism against another microorganisms Explanation: An antibacterial is an agent that inhibits bacterial growth or kills bacteria. The term is often used ... by a microorganism that is antagonistic to the growth of other microorganisms in high dilution.
Description : Which of the following organisms does not fit into the Cell Theory? (1) Bacteria (2) Virus (3) Fungi (4) Plants
Last Answer : (2) Virus Explanation: The cell theory states that all living things are made of cells, cells are the basic units of structure and function of living things, and that all cells come from other cells.
Description : Select the correct combination of the statements (i-iv) regarding the characteristics of certain organisms. (i) Methanogens are archaebacteria which produce methane in marshy areas. (ii) Nostoc is a filamentous blue-green alga which fixes ... iii) (c) (ii), (iii) and (iv) (d) (i), (ii) and (iv).
Last Answer : (d) (i), (ii) and (iv)
Description : Gram negative organisms are largely insensitive to benzyl penicillin because: A. They produce large quantities of penicillinase B. They do not utilise D-alanine whose incorporation in the cell wall is inhibited ... multilayer cell wall of gram negative bacteria D. Both A' and B' are correct
Last Answer : . Benzyl penicillin is not able to penetrate deeper into the lipoprotein-peptidoglycan multilayer cell wall of gram negative bacteria
Last Answer : Virus
Description : An antibiotic is (1) a chemical synthesized by a human cell against a microorganism (2) a chemical synthesised by a micro-organism against another micro-organisms (3) a substance produced by blood cells against bacteria (4) a substance produced by blood cells against infection.
Last Answer : a chemical synthesised by a micro-organism against another micro-organisms
Description : Which one of the following living organisms completely lacks a cell wall
Last Answer : Which one of the following living organisms completely lacks a cell wall A. Cyanobacteria B. Sea-fan (Gorgonia ) C. Saccharomyces D. Blue-green alga
Description : $ DNA contains all the neccesary information and instructions for cell reproduction Reproduction is not essential for the living organisms.
Last Answer : $ DNA contains all the neccesary information and instructions for cell reproduction Reproduction is not essential ... . If both As and R are wrong.
Description : Why contractile vacuoles would be of little value to one cell organisms living in the ocean?
Last Answer : I do get it,for the organism living in the hypertonic saltwater(ocean) the contractile vacuole is most not needed since thewater in the organism are already on thier way out!
Description : What Multi cell living organisms have lived on earth for how many years?
Last Answer : What is the answer ?
Description : The basic unit of all living organisms is (a) A drop of blood (b) A molecule of glucose (c) A set of proteins (d) A cell
Last Answer : Ans:(d)
Description : The basic structural and functional unit of living organisms is - (1) Cell (2) Tissue (3) Organ (4) Systems
Last Answer : (1) Cell Explanation: Robert Hooke (1665) observed a section of cork under his microscope and found its structure resembling a 'honey comb'. He gave the name 'cell' to each of the ... structure. Two German biologists, M Schleiden and T Schwann, proposed the famous cell theory in 1938-39.
Description : The major role of minor elements inside living organisms is to act as (a) co-factors of enzymes (b) building blocks of important amino acids (c) constituent of hormones (d) binder of cell structure.
Last Answer : (a) co-factors of enzymes
Description : Which one of the following living organisms completely lacks a cell wall? (a) Cyanobacteria (b) Sea-fan (Gorgonia) (c) Saccharomyces (d) Blue-green algae
Last Answer : (b) Sea-fan (Gorgonia)
Description : The basic structural and functional unit of living organisms is (1) Cell (2) Tissue (3) Organ (4) Systems
Last Answer : Cell
Description : Which of the following skin conditions is caused by staphylococci, streptococci, or multiple bacteria? a) Impetigo Impetigo is seen at all ages, but is particularly common among children living under poor ... ivy is a contact dermatitis caused by the oleoresin given off by a particular form of ivy.
Last Answer : a) Impetigo Impetigo is seen at all ages, but is particularly common among children living under poor hygienic conditions.
Description : When organisms in the ecosphere diethey are broken down by bacteria.Nutrientssuch as nitratesare released back into the ecosphere.Why is this necessary for the survival of the other organisms in t?
Description : The temperature for pasteurization of milk is selected so as to (a) Kill the micro-organisms (b) Kill all bacteria (c) Store it for long time without coagulation (d) Kill the micro organisms and other harmful bacteria
Last Answer : Ans:(c)
Description : Biological oxidation ponds remove organic matters present in the polluted water by (A) Using the activities of bacteria and other micro organisms (B) Aerobic oxidation (C) Both (A) & (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) & (B)
Description : Except plants, why can't other living organisms prepare food using Co2, water and minerals? -Science-7
Last Answer : Other living organisms cannot prepare their own food because they do not have chlorophyll and thus cannot carry out the process of photosynthesis because chlorophyll traps solar energy and convert it into chemical energy.
Description : Exobiology deals with the study of - (1) external characters of living organisms (2) life on the surface of the earth (3) life in the outer layers of atmosphere (4) life in other planets and space
Last Answer : (4) life in other planets and space Explanation: Exobiology is the branch of science that deals with the possibility and likely nature of life on other planets or in space. The primary ... processes leading to the origin evolution and distribution of life on Earth or elsewhere in the universe.
Description : The 'Red Data Book' is the documentation of endangered rare species of: (1) Flora (2) Fauna (3) Other living organisms (4) All of these are correct
Last Answer : (4) All of these are correct Explanation: A Red Data Book contains lists of species whose continued existence is threatened. Species are classified into different categories of perceived risk. It documents rare ... , plants and fungi, as well as other living organisms in an area, region or country.
Description : What term, in natural sciences, is used to describe a relationship between two living organisms where one benefits and the other is not significantly harmed or helped? It derives from the Latin for ‘sharing a table’?
Last Answer : Commensalism.
Description : The ‘Red Data Book’ is the documentation of endangered rare species of: (1) Flora (2) Fauna (3) Other living organisms (4) All of these are correct
Last Answer : All of these are correct
Description : Exobiology deals with the study of : (1) external characters of living organisms (2) life on the surface of the earth (3) life in the outer layers of atmosphere (4) life in other planets and space
Last Answer : life in other planets and space
Description : what is the term used to describe organisms that cause diseases . example bacteria?
Last Answer : Rickettsia
Description : Bacteria and fungi developing on dead decaying organisms are
Last Answer : Bacteria and fungi developing on dead decaying organisms are A. Parasites B. Commensals C. Saprophytes D. Symbionts
Description : Bacteria that make either a fementative or respiratory set of enzymes are known as (a) Obligate anacerobes (b) Obligate aerobes (c) Microacerophiles (d) Facultative organisms
Description : Which one of the following groups of organisms is thermophilic in that they can tolerate and grow at fairly high temperatures? (a) Certain bacteria and blue-green algae (b) Loris, rhesus monkey and red kangaroo (c) Llamas, camels and yaks (d) Bison, musk-ox and racoon
Last Answer : Ans:(a)
Description : Bacteria and fungi developing on dead decaying organisms are (a) Parasites (b) Commensals (c) Saprophytes (d) Symbionts
Description : Organisms that generate energy using light are known as - (1) Chaemolithotrophs (2) Oligotrophs (3) Bacteria (4) Photoautotrophs
Last Answer : (4) Photoautotrophs
Description : Which of the following groups of organisms reproduce faster? (1) Algae (2) Fungi (3) Bacteria (4) Protozoa
Last Answer : (3) Bacteria Explanation: Unlike in multicellular organisms, increases in cell size (cell growth and reproduction by cell division) are tightly linked in unicellular organisms. Bacteria grow to a ... divide extremely rapidly, and bacterial populations can double as quickly as every 9.8 minutes.
Description : Which of the following organisms is most likely to produce green-house gases such as nitrous oxide and methane? (1) Fungi (2) Earthworm (3) Bacteria (4) Green plants
Last Answer : (4) Green plants Explanation: When it comes to greenhouse gases many of us think first of CO2. But a large proportion of global greenhouse gas emissions are actually other gases, ... from fertilisers and methane mostly from cows. In peat pasture areas these emissions are particularly prevalent.
Description : Of all micro-organisms, the most adaptable and versatile are – (1) Viruses (2) Bacteria (3) Algae (4) Fungi
Last Answer : (1) Viruses Explanation: The viruses are adaptable and versatile with many variations worldwide and they reproduce within the cells of the immune system of infected people. ... versatility an individual has developed to respond to changing interpersonal situations and environmental requirements.
Description : The first photosynthetic oxygen liberating organisms to appear on earth were (1) Cyanobacteria (2) Bryophytes (3) Green algae (4) Bacteria
Last Answer : (1) Cyanobacteria Explanation: Cyanobacteria or blue green algae were the photosynthetic organisms that lived in the ancient ocean. It liberated the oxygen found in the iron oxide.
Description : (3) Conversion of ammonia to nitrites Explanation: Nitrification is the biological oxidation of ammonia or ammonium to nitrite followed by the oxidation of the nitrite to nitrate. The oxidation of ammonia ... -oxidizing archaea (AOA). Nitrification is an important step in the nitrogen cycle in soil.
Last Answer : Acid rain is caused due to pollution of atmosphere by – (1) oxides of carbon and nitrogen (2) oxides of nitrogen and sulphur (3) oxides of nitrogen and phosphorous (4) None of these
Description : Name two diseases caused by following groups of micro-organisms. a) Bacteria b) Viruses c) Protozoa d) Fungi
Last Answer : Answers: a) Tuberculosis, Typhoid, Cholera b) Poliomyelitis, Influenza c) Sleeping sickness, Amoebic dysentery d) Ringworm, Actinomycosis
Description : Which of the following organisms possesses characteristics of a plant and an animal? (a) Euglena (b) Paramecium (c) Bacteria (d) Mycoplasma
Last Answer : (a) Euglena
Description : Name the organisms which do not derive energy directly or indirectly from sun. (a) Chemosynthetic bacteria (b) Pathogenic bacteria (c) Symbiotic bacteria (d) Mould
Last Answer : (a) Chemosynthetic bacteria
Description : Organisms, which fix atmospheric nitrogen in the soil, fall under the category of (a) bacteria (b) green algae (c) soil fungi (d) mosses.
Last Answer : (a) bacteria