Multiple Choice QuestionsGood ozone is found in the
mesosphere
troposphere
stratosphere
stratosphere
C.
stratosphere
The stratosphere is the second major layer of earth's atmosphere, just above the troposphere and below the mesosphere. It is the layer of ozone (O3). The ozone absorb high-energy UV-B and UV-C energy waves and breakdown into atomic Oxygen (O) and diatomic oxygen (O2).
Read the following four statements (I - IV) about certain mistakes in two of them
I .The first transgenic buffalo, Rosie produced mile which was human alpha - lactal bumin enriched
II. Restriction enzymes are used in isolation of DNA from another macro -molecules.
III. downstream processing is one of the steps of R-DNA technology.
IV. Disarmed pathogen vectors are also used in the transfer of R - DNA into the host.
Which are the two statements having mistakes?
Statement (II) and (III)
Statements (III) and (IV)
Statements (I) and (III)
Statements (I) and (III)
D.
Statements (I) and (III)
Transgenic Rosiae is actually Cow. It is first transgenic cow produced in 1997.
Restriction enzymes cut the DNA at a specific site. The separation of DNA is performed by gel electrophoresis
Select the correct statements with respect to diseases and immunisation
if due to some reason B and T - lymphocytes are damaged, the body will not produce antibodies against a pathogen
injection of dead/inactivated pathogens causes passive immunity
certain protozoans have been used to mass produce hepatitis B vaccine
certain protozoans have been used to mass produce hepatitis B vaccine
A.
if due to some reason B and T - lymphocytes are damaged, the body will not produce antibodies against a pathogen
The primary and secondary immune responses are carried out with the help of two special types of lymphocytes present in our blood, i.e, B - lymphocytes and T- lymphocytes, The B- lymphocytes produce an array ( a range) of proteins in response to pathogens into our blood to fight with them. These proteins are called antibodies. The T- cells themselves do not secrete antibodies but the help B- cells to produce them.
Which one of the following is a wrong matching of a microbe and its industrial product, while the remaining three are correct?
Yeast - statins
Acetobacter aceti - acid
Clostridium Butulicum - lactic acid
Clostridium Butulicum - lactic acid
C.
Clostridium Butulicum - lactic acid
Clostridium butulicum forms butyric acid
Ureters act as urogenital ducts in
humans males
human females
frog's both males and females
frog's both males and females
D.
frog's both males and females
In the male frog, vasa efferential finally communicates with the urogenital duct tat comes out of the kidneys and open into claca. The cloaca is a small, median chamber that is used to pass faecal matter, urine and sperms to the exterior.
Which one of the following conditions of the zygotic cell would lead to the birth of a normal human female child?
Two X - chromosomes
Only one Y- chromosomes
Only one X - chromosome
Only one X - chromosome
A.
Two X - chromosomes
The sex determining mechanism in case of humans is XY type. Sperms are of two types, one containing X -chromosome and another containing Y- chromosome.
Which one of the following techniques made it possible to genetically engineer living organism
Recombinant DNA techniques
X -ray diffraction
Heavier isotope labelling
Heavier isotope labelling
A.
Recombinant DNA techniques
Recombinant DNA technology is joining together of DNA molecules from two different species that are inserted into a host organism to produce new genetic combinations.
The logistic population growth is expressed by the equation
dN/dt = rN
dN/dt = rN
B.
A population growing in a habitat with limited resources show initially a lag phase, followed by phases of acceleration and deceleration and finally an asymptote when the population density reaches the carrying capacity. A plot of N (population density at time t) in relation to time (t) results in the sigmoid curve. This type of population grown is called Verhulst -pearl Logistic Growth and is describes by the following equation:
where N = population density at time t,
r = Intrinsic rate of natural increase
K = carrying capacity
Since resources for growth for most animal populations are finite and become limiting sooner or later, the logistic growth model is considered a more realistic one.
Examine the figure below and select the right option giving all the four part (A, B,C and D) correctly identified.
|
A |
B |
C |
D |
|
Archegoni Ophore |
Female thallus |
Gemma cup |
Rhizoids |
|
A |
B |
C |
D |
|
Archegoni |
Female thallus | Bud | Foot |
|
A |
B |
C |
D |
|
Seta |
Sporophyte | Protonema | Rhizods |
|
A |
B |
C |
D |
|
Seta |
Sporophyte | Protonema | Rhizods |
A.
|
A |
B |
C |
D |
|
Archegoni Ophore |
Female thallus |
Gemma cup |
Rhizoids |
Marchantia, a liverwort, is dioecious. The female thallus bears female sex organs called archegonia on special branches called archegoniophores. The plant's body is anchored by unicellular rhizoids.
In history of biology, human genome project led to the development of
biotechnology
biomonitoring
bioinformatic
bioinformatic
C.
bioinformatic
Human Genome Project (HGP) was closely associated with rapid development of the new area in biology called a Bioinformatics, the science of collecting and analysing complex biological data such as genetic codes.
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