What was Marshall Nirenberg and Heinrich Matthaei's contribution to our current understanding of the genetic code?

discovery of codons

discovery and extraction of DNA

creation of a model of DNA

creation of Photo 51

Explain why dead or cliseased trees can serve as a food source for some birds.

what are three possible ways that a mutation could change DNA, yet have no measurable effect on the organism?

True or false. Most of the DNA in the human genome codes forgenes.

Living things share 8 characteristics (listed in Chapter 1 of your textbook on page 19). A living thing grows, undergoes metabolism, responds to its environment, reproduces, passes DNA to the next generation, maintains homeostasis, changes over

Which of the following is true about biochemistry? A. It is a field of study that explains why life is present on earth B. It is a field of study that has been able to describe all of the reactions that occur in a cell. C.

What accounts for genetic biodiversity existing in modern multicellular organisms?

Torri and Tamara are both performing scientific investigations on the learning capabilities of mice. In Torri's experiment, she sets up two knobs in a cage with a mouse. When the mouse touches the knob on the left, it receives a small shock.

What did Chargaff discover while studying bases in the DNA of organisms?

Russia's system of government and identify its basic structure.

Which statement about the light microscope is correct?