Cytotoxic T cells release two proteins to destroy infected cells: ________, which forms pores in the membrane of the infected cells, and ________, which enters the infected cell through these pores and triggers apoptosis.
A) fragmentins : perforins
B) MHC class I : MHC class II
C) perforins : fragmentins
D) complement system proteins : perforins
E) complement system proteins : fragmentins
Ans: C) perforins : fragmentins
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Figure 2 depicts the region of cells (shaded gray) in which the even-skipped protein is present in a developing Drosophila embryo. Which of the following statements about the control of the eve gene is likely true based on Figure 2?
A. The Hunchback protein is an eve repressor. B. The bicoid gene is an insulator for eve gene expression. C. The Krüppel protein is an eve repressor. D. The Giant protein is an eve activator.
Homozygotes with the genotype HbS/HbS have
a. sickle cell anemia. b. malaria. c. blood type SS. d. Fanconi's anemia. e. sickle cell trait.
Which of the following is/are a biological "population?"
A. all of the variable-colored ladybird beetles of the species Harmonia axyridis in a forest B. all male and female English sparrows that reside in your community C. all of the corn plants in a cornfield D. all of the human population of a rural western town E. All of the choices are correct.
Contact with infected cats and their feces is the only mode of transmission of Toxoplasma to humans
Indicate whether the statement is true or false