Disease-causing agents like viruses or bacteria are considered a(n)
What will be an ideal response?
pathogen
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The demographic transition is typically seen
a. when a country moves from an industrial phase into a more agricultural phase. b. as developed countries use more resources. c. when agriculture becomes more efficient. d. when epidemics lead to high death rates. e. as a country moves toward a more industrial phase.
Which statement with regard to Sertoli cells is FALSE?
a. They secrete hormones. b. They are joined by tight junctions. c. They form a blood-testis barrier. d. They phagocytize discarded sperm cytoplasm. e. They facilitate the movement of sperm into the blood
According to the theory of endosymbiosis, which organelles evolved from small prokaryotes that established residence within other, larger prokaryotes?
A) vacuoles and lysosomes B) Golgi apparatus and endoplasmic reticulum C) centrioles and ribosomes D) mitochondria and chloroplasts
During DNA replication the 3' to 5' exonuclease activity of DNA polymerases I and III is required for?
a. polymerization of new DNA strands b. joining of Okazaki fragments following removal of RNA primers c. removal of RNA primers d. proofreading of mistakes made during DNA synthesis