As body temperature rises, how is enzyme activity changed?
a. decreases
b. no change
c. increases
d. decreases and then increases
c. increases
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Chromosomes can be condensed into compact structures, visible with the light microscope, but usually only:
A. while the nuclear pores are open. B. while the proteins are being assembled. C. after the cell is dead. D. while the DNA is being copied into RNA. E. during cell division.
Which statement exemplifies the biological pump concept?
A) Autotrophs bring in light photons to synthesize ATP. B) Bacteria oxidize Fe2+ into Fe3+, and Archaea reduce Fe3+ back into Fe2+. C) Calcium ions are brought into cells while toxic physiological byproducts are released. D) Primary producers sink to the deep ocean, which provides deep ocean organisms with nutrients when the primary producers die.
Imagine that you have found a mutant oak plant that CANNOT produce vascular cambium. What would be the most direct result of this mutation?
a. The plant would not be able to perform photosynthesis. b. The plant would not be able to transport sugar to the roots. c. The plant would not be able to make secondary xylem and phloem. d. The plant would not be able to make leaves.
Jess has A- blood type, has never received a blood transfusion, and never been pregnant. Antibodies against what blood antigens could be present in Jess' blood?
A) O and Rh antigens B) B antigens C) A antigens D) B and Rh antigens E) O antigens