1. Which of the following describes a
Prokaryotic Cell? Answer: Unicellular
Prokaryotes are distinguished from eukaryotes on the basis of nuclear
organization, specifically their lack of a nuclear membrane. Prokaryotes
also lack most of the intracellular organelles and structures that are
characteristic of eukaryotic cells (an important exception is the ribosomes,
which are present in both prokaryotic and eukaryotic cells). Most functions
of organelles, such as mitochondria, chloroplasts, and the Golgi apparatus,
are taken over by the prokaryotic plasma membrane. Prokaryotic cells have
three architectural regions: appendages called flagella and pili - proteins
attached to the cell surface; a cell envelope consisting of a capsule, a
cell wall, and a plasma membrane; and a cytoplasmic region that contains the
cell genome (DNA) and ribosomes and various sorts of inclusions. Typical
Prokaryotic Organisms are Bacteria and Archaea
2. How many chromosomes are present in a normal human cell? Answer: 46
There are 24 distinct human chromosomes: 22 autosomal chromosomes, plus the
sex-determining X and Y chromosomes. Chromosomes 1–22 are numbered roughly
in order of decreasing size. Somatic cells usually have one copy of
chromosomes 1–22 from each parent, plus an X chromosome from the mother, and
either an X or Y chromosome from the father, for a total of 46.
3. Ganymede is a satellite of which planet? Answer: Jupiter
Ganymede is Jupiter's largest moon, and the largest moon in the entire solar
system; it is larger in diameter than Mercury but only about half its mass.
Ganymede is one of four planetary satellites of Jupiter which can be seen
with the naked eye - with good eyesight, a clear night and without the
pollution haze of cities. Other than these, the only other planetary
satellite visible with the naked eye is our own moon.It may have been
discovered by Chinese astronomer Gan De in 364 BC. However, discovery of the
moon is generally credited to Galileo Galilei who documented its existence
in 1610. The name Ganymede was suggested soon after by Simon Marius, for the
cup-bearer of the Greek gods, beloved of Zeus. This name and the names of
the other Galilean satellites fell into disfavor for a considerable time,
and were not revived in common use until the mid-20th century. In much of
the earlier astronomical literature, it is simply referred to by its Roman
numeral designation as Jupiter III or as the "third satellite of Jupiter".
Ganymede is the only Galilean moon of Jupiter named after a male figure.
4. What is the Atomic Number of Chlorine? Answer: 17
Chlorine, is the chemical element with atomic number 17 and symbol Cl. It is
a halogen, found in the periodic table in group 17. As the chloride ion,
which is part of common salt and other compounds, it is abundant in nature
and necessary to most forms of life, including humans. In its elemental form
under standard conditions, it is a pale green gas about 2.5 times as dense
as air. It has a disagreeable, suffocating odor that is detectable in
concentrations as low as 3.5 ppm[1] and is poisonous. Chlorine is a powerful
oxidant and is used in bleaching and disinfectants. It is also used in
swimming pools to keep them clean. In the upper atmosphere, chlorine has
been implicated in destruction of the ozone layer.
5. What is the Element Symbol for Sodium? Answer: Na
Sodium, atomic number 11, atomic mass 22.9898 g/mol, oxidation number +1.
Sodium is a soft, silvery white, highly reactive element and is a member of
the alkali metals within "group 1" (formerly known as ‘group IA’). It has
only one stable isotope, 23Na. Sodium was first isolated by Sir Humphry Davy
in 1807 by passing an electric current through molten sodium hydroxide.
Sodium quickly oxidizes in air so it must be stored in an inert environment
such as kerosene. Sodium is present in great quantities in the earth's
oceans as sodium chloride. It is also a component of many minerals, and it
is an essential element for animal life.
6. Violet light has the shortest wavelength and the highest frequency? Answer: TRUE
Violet, referring to the color of light at the short-wavelength end of the
visible spectrum, approximately 380–420 nanometers when indigo is
recognized, or more commonly 380–450 nm[1] (this is a spectral color).
7. To which Phylum does a Leech belong? Answer: Annelida
The annelids, collectively called Annelida (from Latin anellus "little
ring"), are a large phylum of animals, comprising the segmented worms, with
about 15,000 modern species including the well-known earthworms and leeches.
They are found in most wet environments, and include many terrestrial,
freshwater, and especially marine species (such as the polychaetes), as well
as some which are parasitic or mutualistic. They range in length from under
a millimeter to over 3 metres (the seep tube worm Lamellibrachia luymesi).
8. Hot Spots are associated with which of the following? Answer: Volcanoes
In geology, a hotspot is a location on the Earth's surface that has
experienced active volcanism for a long period of time. J. Tuzo Wilson came
up with the idea in 1963 that volcanic chains like the Hawaiian Islands
result from the slow movement of a tectonic plate across a "fixed" hot spot
deep beneath the surface of the planet. Hotspots are thought to be caused by
a narrow stream of hot mantle convecting up from the mantle-core boundary
called a mantle plume, although some geologists prefer upper-mantle
convection as a cause. This in turn has re-raised the antipodal pair impact
hypothesis, the idea that pairs of opposite hot spots may result from the
impact of a large meteor. Geologists have identified some 40-50 such
hotspots around the globe, with Hawaii, Réunion, Yellowstone, Galápagos, and
Iceland overlying the most currently active.
Most hotspot volcanoes are basaltic because they erupt through oceanic
lithosphere (e.g., Hawaii, Tahiti). As a result, they are less explosive
than subduction zone volcanoes, which have high water contents. Where
hotspots occur under continental crust, basaltic magma is trapped in the
less dense continental crust, which is heated and melts to form rhyolites.
These rhyolites can be quite hot and form violent eruptions, despite their
low water content. For example, the Yellowstone Caldera was formed by some
of the most powerful volcanic explosions in geologic history.
9. Which of the following describes the Haber Process? Answer: Reaction of
Hydrogen and Nitrogen to make Ammonia
The Haber Process (also known as Haber–Bosch process) is the reaction of
nitrogen and hydrogen to produce ammonia.The nitrogen (N2) and hydrogen (H2)
gases are reacted over an iron catalyst (Fe3+) and aluminium oxide (Al2O3)
and potassium oxide (K2O) are used as promoters. The reaction is carried out
under conditions of 250 atmospheres (atm), 450-500°C; resulting in a yield
of 10-20%:
N2(g) + 3H2(g) → 2NH3(g) + ΔH ...(1)
(Where ΔH is the heat of reaction or enthalpy. For the Haber process, this
is -92.4 kJ/mol at 25°C)
The process was first patented by Fritz Haber in 1908. In 1910 Carl Bosch,
while working for chemical company BASF, successfully commercialized the
process and secured further patents. It was first used on an industrial
scale by the Germans during World War I: Germany had previously imported
'Chilean saltpeter' from Chile, but the demand for munitions and the
uncertainty of this supply in the war prompted the adoption of the process.
Without this process, Germany would almost certainly have run out of
munitions by 1916, thereby ending the war. The ammonia produced was oxidized
for the production of nitric acid in the Ostwald process, and the nitric
acid for the production of various explosive nitro compounds used in
munitions.
The Haber process now produces 100 million tons of nitrogen fertilizer per
year, mostly in the form of anhydrous ammonia, ammonium nitrate, and urea.
1% of the world's annual energy supply is consumed in the Haber process
(Science 297(1654), Sep 2002).
10. Is a Chaparral one of the World's Terrestrial Biomes? Answer: YES
Chaparral is a shrubland plant community found primarily in California, USA,
that is shaped by a Mediterranean climate (mild, wet winters and hot dry
summers) and wildfire. Similar plant communities are found in the five other
Mediterranean climate regions around the world, including the Mediterranean
Basin (where it is known as maquis), central Chile (matorral), South African
Cape Region (known there as fynbos), and Australia (Western and Southern).
The word chaparral is a loan word from Spanish. The Spanish word comes from
the word chaparro, which means both small and dwarf evergreen oak, which
itself comes from the Basque word txapar, with the same meaning. A typical
chaparral plant community consists of densely-growing evergreen scrub oaks
and other drought-resistant shrubs. It often grows so densely that it is all
but impenetrable to large animals and humans. This, and its generally arid
condition, makes it notoriously prone to wildfires. Although many chaparral
plant species require some fire cue (heat, smoke, or charred wood) for
germination, chaparral plants are not "adapted" to fire per se. Rather,
these species are adapted to particular fire regimes involving season,
frequency, intensity and severity of the burn.
11. What part of a plant contains chlorophyll and is responsible for
photosynthesis? Answer: Chloroplasts
Chloroplasts are organelles found in plant cells and eukaryotic algae that
conduct photosynthesis. Chloroplasts absorb sunlight and use it in
conjunction with water and carbon dioxide to produce sugars. Chloroplasts
capture light energy from the sun to conserve free energy in the form of ATP
and reduce NADP to NADPH through a complex set of processes called
photosynthesis. It is derived from the Greek words chloros which means green
and plast which means form or entity. Chloroplasts are members of a class of
organelles known as plastids.
12. Which one of these fossils does not include preserved remains of an
organism? Answer: Trace Fossils
Trace fossils, also called ichnofossils are structures preserved in
sedimentary rocks that record biological activity. While we are most
familiar with relatively spectacular, fossilized hard-part remains such as
shells and bones (known as body fossils), trace fossils are often less
dramatic, but nonetheless very important.
Strictly defined, trace fossils must reflect both the anatomy of their maker
in some way, and be the result of behaviour. Sedimentary structures made by
empty shells rolling along the sea floor are thus excluded (as "death
marks"), as are structures such as stromatolites that, although the result
of behaviour, do not reflect the anatomy of their maker. Spun coccoons and
spiders webs are considered to be trace fossils, as they are manipulated by
their makers after secretion; egg cases, on the other hand, are not.
Trace fossils include burrows (such as Chondrites), borings, ichnites
(footprints and track marks), Zoophycus feeding marks, trails (such as
Cruziana scratched by trilobites), coprolites (fossilized droppings) and
other gut-derived objects, and rhizoliths or rhizocretions (the fossil
remains of roots).
The study of trace remains is called ichnology, which is divided into
paleoichnology, or the study of trace fossils, and neoichnology, the study
of modern trace remains.
The science of ichnology is quite challenging, as most trace remains cannot
be positively assigned to a specific organism or even to a specific class of
organisms. Furthermore, trace remains such as burrows can make the work for
paleontologists and paleobiologists more difficult as they rework sediments,
causing older strata to be mixed with younger ones. This can cause some
confusion in interpretation, unless viewed in geologic context.
Adolf Seilacher divided trace fossils into five main behavioral groups:
1. Domichnia are dwelling structures that reflect the life position of the
organism that created it;
2. Fodinichnia are three-dimensional structures left by animals which eat
their way through sediment, such as deposit feeders;
3. Pascichnia are another type of feeding trace, left by grazers on the
surface of a soft sediment or a mineral substrate;
4. Cubichnia are resting traces, in the form of an impression left by an
organism on a soft sediment;
5. Repichnia are surface traces of creeping and crawling, as an organism
moved from one station to another.
13. Which of the following is the defining characteristic of the True
Chordates? Answer: Vertebral Column
Chordates (phylum Chordata) are a group of animals that includes the
vertebrates, together with several closely related invertebrates. They are
united by having, at some time in their life, a notochord, a hollow dorsal
nerve cord, pharyngeal slits, an endostyle, and a muscular tail extending
past the anus. Some scientists argue that the true qualifier should be
pharyngeal pouches rather than slits.[citation needed]
The phylum Chordata is broken down into three subphyla: Urochordata,
Cephalochordata, and Vertebrata. Urochordate larvae have a notochord and a
nerve cord but they are lost in adulthood. Cephalochordates have a notochord
and a nerve cord but no vertebrae. In all vertebrates except for Hagfish,
the dorsal hollow nerve cord has been surrounded with cartilaginous or bony
vertebrae and the notochord generally reduced.
The chordates and two sister phyla, the hemichordates and the echinoderms,
make up the deuterostomes, a superphylum.
The extant groups of chordates are related as shown in the phylogenetic tree
below. Many of the taxa listed do not match traditional classes because
several of those classes are paraphyletic. Different attempts to organize
the profusion of chordate clades into a small number of groups, some with
and some without paraphyletic taxa, have thrown vertebrate classification
into a state of flux. Also, the relationships of some chordate groups are
not very well understood.
Chordates all have:
1. a notochord at least at one point in their life
2. a tail that extends farther than their anus
3. a backbone
The chordata phylum contains vertebrates and invertebrates. Some familar
animals, such as cats, dogs, hamsters, monkeys, and humans themselves are in
the Chordata phylum.
14. What is another term for a Redox Reaction? Answer: Oxidation/Reduction
Reaction Redox (shorthand for oxidation/reduction reaction) describes all
chemical reactions in which atoms have their oxidation number (oxidation
state) changed.This can be a simple redox process, such as the oxidation of
carbon to yield carbon dioxide, it could be the reduction of carbon by
hydrogen to yield methane (CH4), or a complex process such as the oxidation
of sugar in the human body, through a series of very complex electron
transfer processes.
The term redox comes from the two concepts of reduction and oxidation. It
can be explained in simple terms:
1. Oxidation describes the loss of electrons by a molecule, atom or ion
2. Reduction describes the gain of electrons by a molecule, atom or ion
However, these descriptions (though sufficient for many purposes) are not
truly correct. Oxidation and reduction properly refer to a change in
oxidation number - the actual transfer of electrons may never occur. Thus,
oxidation is better defined as an increase in oxidation number, and
reduction as a decrease in oxidation number. In practice, the transfer of
electrons will always cause a change in oxidation number, but there are many
reactions which are classed as "redox" even though no electron transfer
occurs (such as those involving covalent bonds).
Non-redox reactions, which do not involve changes in formal charge, are
known as metathesis reactions.
15. What word describes the following. An organism that creates it's own
nourishment without consuming other organisms? Answer: Autotrophs
An autotroph (from the Greek autos = self and trophe = nutrition) is an
organism that produces complex organic compounds from simple molecules and
an external source of energy, such as light or chemical reactions of
inorganic compounds. Autotrophs are considered producers in a food chain.
Plants and other organisms that carry out photosynthesis are phototrophs (or
photoautotrophs). Bacteria that utilize the oxidation of inorganic compounds
such as hydrogen sulfide, ammonium or ferrous iron as an energy source are
chemoautotrophs (some are known as lithotrophs).
Autotrophs are a vital part of the food chains of all ecosystems. They take
energy from the environment (sun light or inorganic sources) and use it to
process carbon-based and other organic molecules that are used to carry out
various biological functions such as cell growth. Other organisms, called
heterotrophs, utilize autotrophs as food to carry out these same functions.
Thus, heterotrophs — animals, fungi, as well as most bacteria and protozoa —
depend on autotrophs for both energy and raw materials to make complex
organic molecules. This mechanism is called primary production in the sea.
Heterotrophs obtain energy by breaking down organic molecules obtained in
food. Carnivorous animals ultimately rely on autotrophs because the energy
and organic building blocks obtained from their prey comes from autotrophs
they preyed upon.
There are some species of organisms that require organic compounds as a
source of carbon, but are able to use light or inorganic compounds as a
source of energy. Such organisms are not defined as autotrophic, but rather
as heterotrophic. An organism that obtains carbon from organic compounds but
obtains energy from light is called a photoheterotroph, while an organism
that obtains carbon from organic compounds but obtains energy from the
oxidation of inorganic compounds is termed a chemoheterotroph.
Information obtained from the Wikipedia web site. Wikipedia the free encyclopedia.