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TLS Online TPP Program

#Question id: 10892

Considering environment and ecosystem, identify the INCORRECT statement

#Unit 10. Ecological Principles
  1. In detrital food chain, it is very difficult to measure the energy flow although the use of radioactive tracers give some idea about the energy flow
  2. The change in species composition, community structure and function over time is ecological succession
  3. The slower rise of environmental temperature may be attributed to the increase in pollution in environment which reflects enough solar energy back to other spacer to slow down global warming
  4. Photoperiodism has no relation with the environment and ecosystem, rather it is a biological event taking place in every plant
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TLS Online TPP Program

#Question id: 2869

#Unit 2. Cellular Organization

Galactose imported into the yeast cell is converted to galactose 6-phosphate by a pathway involving six enzymes, whose genes are scattered over three chromosomes. Transcription of these genes is regulated by the combined actions of the proteins Gal4p, Gal80p, and Gal3p,

i. GAL3

a. Interaction with the Gal80p-Gal4p complex and activates Gal4p.

ii. GAL4

b. Recruits SAGA, Mediator, and TFIID to the galactose promoters, leading to DNA polymerase II recruitment and initiation of transcription

iii. GAL80

c. Transcriptional inhibitor

d. Transcriptional activator

TLS Online TPP Program

#Question id: 2870

#Unit 2. Cellular Organization

In Escherichia coli, the synthesis of tryptophan is controlled by the tryptophan operon that is repressed in the presence of excessive tryptophan. When a mutant strain that has lost the regulatory gene of the tryptophan operon is placed in a medium that contains all nutrients the cells need to grow except tryptophan, which of the following will occur?
TLS Online TPP Program

#Question id: 2871

#Unit 2. Cellular Organization

With respect to X-chromosome inactivation in females, which, if any, of the following statements is incorrect?
TLS Online TPP Program

#Question id: 2872

#Unit 2. Cellular Organization

Concerning disorders resulting from unstable expansion of tandem oligonucleotide repeats, which, if any of the following statements is false.

A) The expansions can occur in coding DNA in some cases, and in noncoding DNA in other cases.

B) The repeats are of a variable number of nucleotides (from three to six) in both coding DNA and noncoding DNA.

C) The expansions in noncoding DNA are generally much larger in size than those in coding DNA.

D) The expanded arrays in noncoding DNA always result in loss of function of the host gene or of a neighboring gene.
TLS Online TPP Program

#Question id: 2873

#Unit 2. Cellular Organization

With reference to aberrant methylation of bases which of the following statements, if any, is false?
TLS Online TPP Program

#Question id: 2874

#Unit 2. Cellular Organization

Match one item from numbered group A with a lettered item from group B.

GROUP I

GROUP II

1. Yeast artificial chromosomes

a. They are more stable

2. Bacterial artificial chromosome

b. It is very hard to construct

c. It is not so hard to construct

d. They are unstable

e. are used to clone the DNA inserts up to 300kb

f. are used for cloning very large (1000-2000kb) DNA segments