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TLS Online TPP Program

#Question id: 7105

The "default model" for neural tissue formation states that

#Unit 5. Developmental Biology
  1. No mechanism is required to form nervous tissue in the embryo; it forms unless signals direct development of epidermal tissue.
  2. Neural tissue formation is the default state, such that special induction is required to form mesoderm, endoderm and epidermis, but not neurectoderm.
  3. Neurectoderm formation is inhibited by the BMP proteins present throughout the early embryo, and this inhibition is relieved by BMP antagonists from the organizer, such as chordin
  4. The induction of neural tissue is the default state in embryos, and all other inductions are special.
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TLS Online TPP Program

#Question id: 6998

#Unit 5. Developmental Biology

Which of the following is an adult organism that has fewer than 1,000 cells?
TLS Online TPP Program

#Question id: 2838

#Unit 2. Cellular Organization

You want to study the potential interaction between nucleosome-bound DNA and a specific histone deacetylase. You decide to perform an electrophoretic mobility shift assay (EMSA). You use a 32P end-labelled, linear template DNA that contains two nucleosome positioning sites. You assemble two nucleosomes on the DNA template before incubation with and without the histone deacetylase. For some reactions, you use unmodified nucleosomes. For other reactions, you use nucleosomes that are methylated at lysine 36 of the histone protein H3.

A. The histone deacetylase binds nucleosome bound-DNA in lanes 1, 2, 3, and 4.

B. The histone deacetylase binds nucleosome bound-DNA in lanes 3& 4.

C. The histone deacetylase seems to recognize methylated nucleosomes at lysine 36 of histone H3 in lane 1, 2 & 3 better than unmethylated nucleosomes in lane 4 &5

D. The histone deacetylase seems to recognize methylated nucleosomes at lysine 36 of histone H3 in lane 1 & 2 better than unmethylated nucleosomes in lane 3 &4
TLS Online TPP Program

#Question id: 16119

#Unit 7. System Physiology – Animal

Following statements are regarding to Shivering, which is the most potent mechanism for increasing heat production in the body. 
A. Cold environmental temperatures activate centers in the posterior hypothalamus during shivering, which then activate the α and γ motoneurons innervating skeletal muscle. 
B. Shivering involves skeletal muscle contracts rhythmically, generating heat and raising body temperature.
C. Shivering involves stimulation of Na+-K+ ATPase and raising body temperature.
D. Shivering involves stimulation of β receptors in brown fat, which increases metabolic rate and heat production.
Which of the following combination is correct?
TLS Online TPP Program

#Question id: 27386

#Unit 1. Molecules and their Interaction Relevant to Biology

Choose the correct statements of the following

1.The Lithium Cations is significantly smaller than the Lithium atom

2.The Lithium Cations is significantly larger than the Lithium atom

3.The Chlorine anion is significantly larger than the Chlorine atom

4.The Chlorine anion is significantly smaller than the Chlorine atom
TLS Online TPP Program

#Question id: 14835

#Unit 5. Developmental Biology

There are three main ways in which inducing signals may be passed between cells EXCEPT