Experiments conducted in the 1920s by Frederick Griffith involving the bacterium Diplococcus pneumoniae demonstrated that a substance from one bacterial strain could genetically transform other bacterial strains

What was the name of the substance capable of such transformation, and who finally determined its identity?


deoxyribonucleic acid (DNA); Avery et al. (

Biology & Microbiology

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Larger animals have higher basal metabolic rates than smaller animals

A. true B. false

Biology & Microbiology

If melanocyte-stimulating hormone were increased, you would expect ____

a. changes in kidney function for retention of water b. increase in reproductive or estrus cycles c. decrease in heat loss from the body surface d. increase in pigmentation in the skin e. decrease in milk production in females

Biology & Microbiology

Homologous chromosomes pair during ____________________

a. metaphase II. b. prophase I. c. metaphase I. d. telophase I.

Biology & Microbiology

After an active cytotoxic T cell binds to an

ailing cell, it releases toxins that

a. poke holes in the cell and cause it to die. b. bind to the cell and prevent it from harming other self cells. c. attract macrophages to the cell. d. poke holes in the cell and cause it to die, and bind to the cell and prevent it from harming other self cells. e. cause all of these to occur

Biology & Microbiology