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TLS Online TPP Program

#Question id: 759

The Watson and Crick structure of DNA refers to:

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. The B form

  2. a right-handed helix with 10 base-pairs per turn

  3. The bases in the center, held together by hydrophobic interactions and phosphate bonding.

  4. a and b

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TLS Online TPP Program

#Question id: 2858

#Unit 2. Cellular Organization

When lactose enters the cell, it is converted to allolactose. It is allolactose (rather than lactose itself) that controls the Lac repressor. Paradoxically, the conversion of lactose to allolactose is catalyzed by b-galactosidase, itself encoded by one of the lac genes. How is this possible? Which statement is incorrect according lac genes expressions?
TLS Online TPP Program

#Question id: 3922

#Unit 3. Fundamental Processes

The σ70 subunit in E. coli RNA polymerase acts as a/an __.
TLS Online TPP Program

#Question id: 23891

#Unit 13. Methods in Biology

Which of the following is (are) used both in the polymerase chain reaction (PCR) and in DNA sequencing?
a. single-stranded DNA primers
b. deoxynucleotide triphosphates (dNTPs)
c. dideoxynucleotide triphosphates (ddNTPs)
d. DNA polymerase
TLS Online TPP Program

#Question id: 18221

#Unit 9. Diversity of Life Forms

In animal cells and in the meristem cells of land plants, the nuclear envelope disintegrates during mitosis. This disintegration does not occur in the cells of most protists and fungi. According to our current knowledge of plant evolution, which group of organisms should feature mitosis most similar to that of land plants? 
TLS Online TPP Program

#Question id: 11005

#Unit 7. System Physiology – Animal

Which of the following phases of the cardiac cycle follows immediately after the beginning of the QRS wave?