TLS Online TPP Program

#Question id: 3928


An extremely large lactose source is encountered by an E. coli cell in the lumen of the small intestine of a human who just ate an entire carton of ice cream. Which of the following would most likely be a contributor to why the E. coli does not metabolize any of the lactose?

#Unit 3. Fundamental Processes
  1. presence of allolactose

  2. presence of phosphorylated adenylate cyclase

  3. absence of glucose

  4. absence of cAMP

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TLS Online TPP Program

#Question id: 322

#Unit 1. Molecules and their Interaction Relevant to Biology

A covalent bond is likely to be polar when ________.

TLS Online TPP Program

#Question id: 13022

#Unit 10. Ecological Principles

A certain species of pine tree survives only in scattered locations at elevations above 2,800 m in the western United States. To understand why this tree grows only in these specific places an ecologist should

TLS Online TPP Program

#Question id: 26910

#Unit 10. Ecological Principles

Carnivores are the animals that has the ability to obtaining amino acid by__

TLS Online TPP Program

#Question id: 8901

#Unit 9. Diversity of Life Forms

The origin of the craniates occurred at roughly the same time as the

TLS Online TPP Program

#Question id: 13131

#Unit 10. Ecological Principles

Biologists performed an experiment with flies to examine the effects of population size on the maintenance of genetic variation  and  on  egg-to-adult survival.  From  a  large  source  population, they  randomly  assigned  eggs  to  three experimental  populations  of  size  N,  equal  to  20,  60,  and0100.  For  later  generations,  they  collected  N  eggs  from each  population  and  moved  them  into  identical  vials  that  co0ntained  f2re0sh  me4d0ium.  Th6e0y  coun8te0d  the  number  of adult flies that emerged and used tissue samples from the adults for genetic analyses. Genetic variation was measured by  scoring  alleles  at  several  polymorphic  loci  and  expressed  as  the  average  number  of  alleles  at  those  loci.  The results are summarized in Figure 1 and Figure 2 below.


The numbers of adult flies that emerged from the three populations in the first generation are closest to which of the following?