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TLS Online TPP Program

#Question id: 15173

Microbes such as Chlorobium and Chromatium develop as visible green and purple zones. These microorganisms use

#Section 6: Plant, Animal and Microbial Biotechnology
  1. Hydrogen sulfide as an electron source, and CO2 from sodium carbonate as a carbon source
  2. Hydrogen sulfide as an electron source, and O2 from sodium carbonate as a oxygen source
  3. Mercuric chloride as an electron source, and CO2 from sodium carbonate as a carbon source
  4. Citrate as an electron source, and ethanol as a carbon source
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TLS Online TPP Program

#Question id: 27255

#Section 3: Genetics, Cellular and Molecular Biology

Which histone(s) are associated with the linker DNA of a nucleosome?
TLS Online TPP Program

#Question id: 3773

#Section 3: Genetics, Cellular and Molecular Biology

DNA contains the template needed to copy itself, but it has no catalytic activity in cells. What catalyzes the formation of phosphodiester bonds between adjacent nucleotides in the DNA polymer being formed during DNA replication?
TLS Online TPP Program

#Question id: 148

#Section 2: General Biology

The pKa of a certain weak acid is 4.0. Calculate the ratio of proton acceptor to proton donor at pH 7.0.
TLS Online TPP Program

#Question id: 1567

#Section 2: General Biology

Which of the following cell types are responsible for initiating a secondary immune response?
TLS Online TPP Program

#Question id: 4741

#Section 3: Genetics, Cellular and Molecular Biology

The F2 progeny from a particular cross exhibit a modified dihybrid ratio of 9 : 7 (instead of 9 : 3 : 3 : 1). What phenotypic ratio would be expected from a testcross of the F1?