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TLS Online TPP Program

#Question id: 2061

Which of the following types of molecules are hydrophilic and therefore excluded from the hydrophobic portion of the phospholipid bilayer?

#SCPH01 Biochemistry

  1. transmembrane proteins

  2. integral membrane proteins

  3. peripheral membrane proteins

  4. cholesterol

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TLS Online TPP Program

#Question id: 9172

#SCPH28 | Zoology

Two plant species live in the same biome but on different continents. Although the two species are not at all closely related, they may appear quite similar as a result of ________.
TLS Online TPP Program

#Question id: 9215

#SCPH06 I Botany

Use the following figure to answer the question


Five new individuals were added to a small population of bighorn sheep in 1986, and ten more were added between 1990 and 1994. According to the figure, what occurred in this population after these additions?
TLS Online TPP Program

#Question id: 15655

#SCPH01 Biochemistry

You are studying a new strain of E. coli that can utilize the disaccharide melibiose very efficiently. You find that utilization depends on the enzyme melibiase, which is encoded by the gene Mel1. Mel1 is not expressed unless melibiose is present in the growth medium. Next you isolate a mutation, designated MelB–, which gives uninducible melibiase activity. Mapping experiments show that MelB– is linked to Mel1. Using an F' factor that carries the chromosomal region surrounding Mel1, you perform the following genetic tests:

 
Describe the proposal for the type of regulatory functions affected by the MelB– mutation.
TLS Online TPP Program

#Question id: 11798

#SCPH05 I Biotechnology

Companion cells transport of photosynthetic products from producing cells in mature leaves to the sieve elements in the minor veins of the leaf. There are at least three different types of companion cells in the minor veins of mature, exporting leaves, All three cell types have dense cytoplasm and abundant mitochondria;
TLS Online TPP Program

#Question id: 3652

#SCPH28 | Zoology

Alkylating agents are electrophilic chemicals which readily add alkyl groups to various positions on nucleic acids. A common example is: