TLS Online TPP Program

#Question id: 11556


During mammalian labor and delivery, the contraction of uterine muscles is enhanced by oxytocin. This is an example of ________.

#SCPH28 | Zoology
  1. a negative feedback system
  2. a hormone that acts in an antagonistic way with another hormone
  3. a hormone that is involved in a positive feedback loop
  4. signal transduction immediately changing gene expression in its target cells
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TLS Online TPP Program

#Question id: 12961

#SCPH06 I Botany

Refer to the following experiment, which is designed to test the co evolutionary relationships among an unpalatable butterfly (the  monarch),  a  palatable  butterfly  (the  viceroy),  and  a  butterfly  predator  (the  jay).  Monarch butterflies are reared on three diets: milkweed (their natural food), cabbage, and cabbage treated with an extract from milkweed leaves. Viceroy butterflies, mimics of monarchs, also are reared on three diets: willows (their natural food), cabbage, and cabbage treated with an extract from milkweed leaves. In trial 1 of the first experiment, adult butterflies reared on a particular diet are presented one at a  time  at  1-hour  intervals  to  jays  and  the  jays  are  allowed  to  feed.  Each jay is  fed  until  it refuses to eat the butterfly presented, but no more than 12 butterflies are presented to a jay during a particular test. Five birds are used for each test; therefore, up to 60 butterflies can be consumed for each diet test. The observer records the actual number of butterflies  eaten. In trial 2, the experiment is repeated 2 weeks later. In the second experiment, the butterflies are reared on the same diets as in experiment 1. However, when they are offered to jays, some jays receive a monarch  reared  on  milkweed  before  being  offered  the  butterflies  reared  on  the  experimental  diets;  the  other  group  of jays is  first given a viceroy reared on willow before being  offered the butterflies reared on the experimental diets. The initial butterfly offered is included in the total number eaten, but no more than 12 butterflies are presented to each jay.

The data in the table indicate which of the following?

TLS Online TPP Program

#Question id: 319

#SCPH05 I Biotechnology

London dispersion forces are attractive forces that arise due to

TLS Online TPP Program

#Question id: 3443

#SCPH28 | Zoology

The evolution of mating systems is most likely affected by

TLS Online TPP Program

#Question id: 19215

#SCPH28 | Zoology

After the initial attachment step, A. tumefaciens produces a network of ________fibrils that bind the bacterium tightly to the plant cell surface. 

TLS Online TPP Program

#Question id: 19766

#SCPH05 I Biotechnology

Which of the following molecule possesses linear structure ?