1. Which is not a characteristics of an organic compound?
A. Conduct electric current
B. Low melting and boiling points
C. Usually flammables and combustible
D. Generally formula in non-polar solvents
Ans: A. Conduct electric current
- The general properties of organic compounds are as follows: a )
low melting and boiling points b) generally soluble in non-polar solventsand
most are not soluble in water c) do not conduct electric current d) usually
flammable and consumable e) presence) of covalent bond.
2. Which is NOT a character of an organic compound?
A. Acetylene
B. Anthracene
C. Benzene
D. Polyethylene
Ans: Polyethylene
- Polythylene is the most produced plastic in the world. It is a
polymer that we usually see everyday from bag, shampoo bottles, children’s and
even bullet proof vest. A molecule of polyethylene is a long chain of carbons
used in making color designs in the fabrics Benzene is an important organic
chemical compound which is natural part of crude oil and gasoline.
3. A substance with a structural formula of was
found to be present in the breath of a patient indicating that he diabetes. To
which carbonyl group does this substance belong?
A. Aldeyde
B. Carboxylic acid
C. Ester
D. Ketone
Ans: D. Ketone
- The substance with the structural
formula is
acetone. Acetone is the simplest and the most common ketone. Acetone is
produced in the body during lipid metabolism. The presence of acetone in a
urine sample or on the breath is positive indicator of diabetes ketone belongs
to a carbonyl group (carbon oxygen double bond) with alkyl or aryl attached to
it just like what is shown in the structural formula of acetone.
4. Methyl propyl ether is used as a general anaesthetic. Which
of the following is its formula?
A. HCOOH
B. CH₃ CH₂ OH
C. CH₃ OCH₂ CH₂ CH₃
D. CH₃ CH₂ CH₃
Ans: C. CH₃ OCH₂ CH₂ CH₃
- Ethers are organic compounds tha contain an oxygen between two
alkyl groups. They have the formula R-O-R with R’s beings the alkyl groups.
Choice A is methanoic acid or formic acid. Choice B is ethyl alcohol. Choice D
is propane.
5.Whta are compounds with the same molecular formula but with
different structural formula?
A. Amines
B. Amides
C. Eter
D. Isomers
Ans D. Isomers
- Are
compounds with the same molecular but with different structural formula. This
means that isomers contain the same number of atoms of each element have
different arrangement of their atoms. This is also the reason why there are so
many organic compounds in existence. Amine is a hydrocarbon chain attached to
an amino group. Amide is a compound where the N
of an amine attached to the carbon atom of a carbonyl group. Ester is a
compound in which an alkyl or aromatic group for the hydrogen atom of the
carboxyl group of carboxylic acid.
6. A compound was a subjected to Tollen’s test. There appeared a silver mirror on the
inner wall of the test tube. What is the compound most likely?
A. Aldehyde
B. Carboxyic acid
C. Ester
D. Ketone
Ans: A. Aldehyde
- Tollens’ test also known as silver-mirror test is a qualitative
laboratory test commonly used to distinguish between an aldehyde and ketone. It
is based on the ability of silver ions to oxidize aldehydes. In practice, when
an aldehyde is combined with an ammonia complex of silver in a basic acqeous
solution, the aldehyde slowly reduces the complex to the glass, forming a
highly reflective surface.
7. What basic reaction of alkanes is being represented by the
equation below?
 |
A. Cracking
B. Dehydrogenation
C. Halogenation
D. Isomerization
Ans: C. Halogenation
- In organic chemistry, halogenation is the reaction of a halogen
with another substance in which a halogen atoms ends up as part of that
substance. A halogen is substituted for a hydrogen atom. When a specific
halogen like chlorine is used, the reaction is called chlorination. Cracking is
the breaking up large molecules structures.
8. What is a condensation reaction?
A. It happens when two reactants add together to form a single
product
B. It is a reaction in which two molecules are combined by removing
a small molecule
C. It occurs when one atom in a molecule is exchange by another
atom or group of atoms
D. It is a reaction in which a single reactant is split into two
products and one of the products
Ans: B. It is a reaction in which two molecules are combined by
removing a small molecule
- Choice A is addition reactions. Choice C is substitution. Choice
D is elimination reaction.
9. What are formed by the reaction of oxygen-containing acids
with alcohols?
A. Aldehydes
B. Alkanes
C. Ester
D. Ketones
Ans: C. Ester
- Esters are compounds that are commonly formed by the reaction of
oxygen containing acids with alcohols. Alcohol can be converted to esters by
means of the Fischer Esterification Process. In this method, an alcohol is
reacted with a carboxylic acid in the presence of an inorganic acid catalyst
10. Which organic group compound reaction is involved in the
formation of soap?
A. Hydrogenation
B. Hydrogenolysis
C. Hydrolysis
D. Saponification
Ans: D. Saponification
- is the hydrolysis of an ester by a
strong base (NAOH or KOH) to produce an alcohol and a salt. Soap is produce if
the salt formed is formed I form a high molar-mass acid. Hydrogenation is a
chemical reaction between molecular hydrogen (H₂) an another compound and
breaks that compound bonds, forming two molecules as a result. Hydrolysis is a
reaction involving the breaking of a bonds in a molecule using water. The
reaction mainly occurs between an ion and water molecules and often changes the
pH of a solution.
11. Equal amounts of copper (II) Sulphate solution and sodium
tartarate solution were added to the test solution. After boiling, a positive
result is indicated by the formulation of a brick-red precipitate of copper (I)
oxide. The tets showed that the solution contains reducing sugar and aldehydes.
What tets of organic compounds is being described?
A. Barfoed’s Test
B. Fehling’s Test
C. Molisch Test
D. Resorcinol test
Ans: B. Fehling’s Test
-In fehlings test, the presence of aldehydes but not ketones is
detected by reduction of deep blue solution of copper (II) to a red precipitate
of in insoluble copper oxide. The test is commonly used for reducing sugar but
is known to be not specific for aldehydes.
12. What do some monerans form to survive in unfavorable
conditions?
A. Hyphae
B. Endospores
C. Plasmid
D. Vaccines
Ans: B. Endospores
- When living conditions become unfavorable, some monerans can
form dehydrated cellscalled endospores. Endospores have thick walls and can
resist temperature, high UV radiation, desiccation chemical damage. And
enzymatic destruction.
13. Which of the following is NOT a character istic of an active
virus?
A. It multiplies quickly
B. It uses energy to grow
C. It destroys its host
cells
D. It has an outer coal made of proteins
Ans: B. It uses energy to grow
- Viruses are infectious agents made up of core of nucleic acid
and protein coat. Viruses are not cells. They are not living. They do no not
eat, respires, grow or respond to environment changes as cells do. Viruses
multiply though the lytic cycle where the virus attacks the host, injects it
nucleic acid into the host ad then spreads or burst from the host.
14. Which of the following is a characteristic of all protest?
A. Eukaryotic
B. Heterotrophic
C. Multicellular
D. Prokaryotic
Ans: A. Eukaryotic
- Protist are all the eukaryotic organism that are not animals,
plants or fungi. They live wherever there is water. They are primarily
microscopic and unicellular, or made up a single cell. The only characteristic common
to protest is that they are all eukaryotic organism. Eukaryotic cells have
membrane-bound nucleic and membrane-bound organelle.
15. All of the following describe a fungus EXCEPT __________ .
A. autotrophic
B. eukaryotic
C. heterotrophic
D. reproduce with spores
Ans: A. autotrophic
- Fungi are eukaryotic organism
that include microorganism such as yeast and molds as well as the more
familiar mushrooms. All fungi are heterotrophs; they obtain nutrition from
other organism. Fungal cell walls are composed mainly of the modified
carbohydrates chitin. Most fungi are multi cellular, although yeast are
unicellular.
16. Which are often described by a scientist as extremophiles?
A. Archea
B. Bacteria
C. Chemotrophs
D. Phototrophs
Ans: A. Archea
-- There are two kinds of microorganism that are divided into
prokaryotes and those include bacteria and archaea. They look similar under the
microscope but they differ in terms of chemical composition and cell process.
Both bacteria and archaea have different Ribosomal RNAs (Rrna). Archea have
three RNA polymeras like eukayotes but bacteria have only one. Archea are
extremophiles, meaning they thrive in physically or geochemically extreme conditions.
Arhcaea were originally discovered in places that derives energy from chemical.
A phototroph is an organism that obtains energy from the sun.
17. Most minerals reproduce asexually through binary fission.
What is binary fission?
A. It is a reproduction form ovum without fertilization
B. It is a process exchanging generic material through
cell-to-cell contact
C. It is a process that replicates DNA and distributes it into two
daughter cells
D. It is an asexual reproduction in which the organism is split
into two fragments
Ans: C. It is a process that replicates DNA and distributes it
into two daughter cells
- Binary fission is a process in which the chromosomes of a
unicellular organism continually replicated, after which the cell divides
forming two identical cells. Choice A is parthegonesis. Choice B conjugation.
Choice D is fragmentation.
18. Under which group re asymmetrical, single-celled organism
with a feeding groove excavated from one side classified?
A. Amoebozoa
B. Excavata
C. Opisthokonta
D. Rhizaria
Ans: B. Excavata
- Excavata are supergroup of protists that are defined by an
asymmetrical appearance with a feeding groove that is “excavated” from one
side; it includes various types of organism which are parasitic, photosynthetic
and heterotrophic predators. It includes the protists, diplomonads,
parabasalids and euglenooans.
19. Which of h the following belongs to the eukaryotic super
group chromalveolata?
A. Euglena
B. Paramecium
C. Red algae
D. Slime molds
Ans: B. Paramecium
- Paramecium includes protists that have organized their cilia
into a plate- like primitive, mouth, called an oral groove, which is used to
capture and digest bacteria. It belongs to the super group chromalveolata and
slime molds belongto excavate; red algae belongs to archaeplastida ; and slime
mold belongs to amoebozoa.
20. Which pair of classification is CORRECT?
A. Archaeplastida: Fungi
B. Excavata: Dinoflagellates
C. Rhizaria: Land plants
D. Opisthonokonta: Animals
Ans: D. Opisthonokonta: Animals
- The eukaryotic super group opisthonokonta consist of animals,
nucleariids, fungi and choanoflagellates. Dinoflagellates belong to
chromalveolata while land plants belongs to archaeplastida.
No comments:
Post a Comment