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TLS Online TPP Program

#Question id: 5761

E. coli cells were spread on an agar plate, producing 1000 colonies.  The colonies are replica plated on two agar plates containing the antibiotic kanamycin and one agar plate without antibiotics.  All of the colonies are able to grow on the agar plate without antibiotic but only 4 colonies are able to grow on each of the agar plates containing kanamycin.  You notice that the four colonies that grew on each of the kanamycin containing plates are in the exact same position.  This demonstrates

#8. Inheritance Biology

  1. how to screen for environmental mutagens

  2. that mutations occur in prokaryotes as well as in eukaryotes

  3. that in some cases mutations are caused by the selective agent itself

  4. a direct correlation between the amount of the selective agent used and the number of resistant mutants (one-hit relationship)

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TLS Online TPP Program

#Question id: 16124

#7. System Physiology – Animal

Thermoreceptors are:
a) activated only by severe cold or severe hot
b) located on the superficial layers of the skin
c) a subtype of nociceptors
d) on dendritic endings of A delta fibres and C fibres
which of following combination is correct?
TLS Online TPP Program

#Question id: 16309

#7. System Physiology – Animal

Which of the following statements correctly describe the reason of heat stroke.
TLS Online TPP Program

#Question id: 16310

#7. System Physiology – Animal

The temperature of the body is regulated almost entirely by nervous feedback mechanisms, and almost all these mechanisms operate through temperature regulating centers located in the hypothalamus. Following statements are as follows:
A. The anterior hypothalamic-preoptic area contains large numbers of heat-sensitive neurons, as well as about one third as many cold-sensitive neurons. These neurons are believed to function as temperature sensors for controlling body temperature.
B. The heat-sensitive neurons increase their firing rate 2- to 10-fold in response to a 10°C increase in body temperature. 
C. The cold-sensitive neurons, by contrast, increase their firing rate when the body temperature increases.
D. Anterior hypothalamus integrates the central and peripheral temperature sensory signals.
Which of the following combination is correct?
TLS Online TPP Program

#Question id: 16311

#7. System Physiology – Animal

What is stress?
TLS Online TPP Program

#Question id: 16312

#7. System Physiology – Animal

Any situation that is out of the ordinary, known as:
TLS Online TPP Program

#Question id: 16313

#7. System Physiology – Animal

Stress in small amounts: