Some organisms obtain their energy from preexisting chemical compounds and get their carbon from the atmosphere. Which of the following terms describes these organisms?
a. photoheterotrophs
b. chemoautotrophs
c. photoautotrophs
d. chemoheterotrophs
Answer: b. chemoautotrophs
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Many amphibian populations have been decimated by a parasitic fungus classified as a member of the _____
A) Chytridiomycota B) Ascomycota C) Basidiomycota D) Zygomycota E) Glomeromycota
What is the function of the stem part of the Y-shaped antibody (that is, the part formed by the two heavy chains joined together)?
a. It recruits immune cells to destroy the antibody antigen clump. b. It stimulates T cells to attack bacteria and other foreign cells. c. It attaches to foreign antigens, producing a large antibody antigen clump. d. It attaches the antibody to the B cell membrane. e. It has proteolytic activity, degrading viral proteins.
Would it be possible and/or appropriate to design a genetic screen to look for a gene(s) involved in homosexuality?
What will be an ideal response?
Which of these is a symptom of vitamin A deficiency?
A) anemia B) severe combined immunodeficiency disease (SCID) C) diabetes D) blindness E) blood doping