From his work with Streptococcus pneumoniae bacteria, Griffith described the transforming principle. What did this principle prove to be?

a. a polysaccharide capsule
b. a phospholipid
c. protein
d. DNA


Answer: d. DNA

Biology & Microbiology

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Which external factors influence a cell to divide?

What will be an ideal response?

Biology & Microbiology

An organism with a diploid chromosome number of 46 will produce 223 combinations of chromosomes at the end of meiosis

Indicate whether the statement is true or false

Biology & Microbiology

The greenhouse effect is a natural and important phenomenon because it

A) removes smog from affected areas. B) maintains the surface temperature on Earth. C) reverses the effect that CFCs have on the ozone layer. D) decreases the amount of carbon dioxide in the stratosphere. E) reverses the effects of deforestation.

Biology & Microbiology

Hydrogen bonds between different parts of the polypeptide chain result in which level of protein structure?

A. primary B. secondary C. tertiary D. quaternary

Biology & Microbiology