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TLS Online TPP Program

#Question id: 1701

Which of the following statements is TRUE of superantigens?

#Unit 4. Cell Communication and Cell Signaling

  1. Superantigens do not cause pathology

  2. Superantigens are not mitogenic for T-cells

  3. Superantigens bind to MHC class III

  4. Superantigens bind to all members of a given V β TCR family

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TLS Online TPP Program

#Question id: 19018

#Unit 9. Diversity of Life Forms

which trait(s) is (are) shared by many modern gymnosperms and angiosperms? 
1. Pollen transported by wind 
2. Lignified xylem 
3. Microscopic gametophytes 
4. Sterile Sporophylls, modified to attract pollinators 
5. Endosperm 
TLS Online TPP Program

#Question id: 19019

#Unit 9. Diversity of Life Forms

Arrange the following structures, which can be found on male pine trees, from the largest structure to the smallest structure (or from most inclusive to least inclusive). 
1. sporophyte 2. microspores 
3. microsporangia 4. Pollen cone 
5. Pollen nuclei 
TLS Online TPP Program

#Question id: 19020

#Unit 9. Diversity of Life Forms

The main way that pine trees disperse their offspring is by using 
TLS Online TPP Program

#Question id: 19025

#Unit 8. Inheritance Biology

Consider the ABO “blood type” gene. This single gene has three alleles called A, B, and O. There are four resultant “blood types” (phenotypic classes), as follows: C
                         
Assume Hardy-Weinberg equilibrium,  the frequencies of the A and B alleles are 0.26 and 0.07, respectively. You now examine the ABO blood types in a new population. You observe that the A, B, and O blood types all have equal frequencies in this population. What are the frequencies of the A and O alleles in this population?
TLS Online TPP Program

#Question id: 19026

#Unit 8. Inheritance Biology

Consider the ABO “blood type” gene. This single gene has three alleles called A, B, and O. There are four resultant “blood types” (phenotypic classes), as follows:
                             
Assume Hardy-Weinberg equilibrium, the frequencies of the A and B alleles are 0.26 and 0.07, respectively. You now examine the ABO blood types in yet another population. You observe that the AB blood type has a frequency of 0.50 in this population. What are the frequencies of the A and O alleles in this population?
TLS Online TPP Program

#Question id: 19027

#Unit 9. Diversity of Life Forms

The following characteristics all helped seedless plants become better adapted to land except