What was marshall nirenberg and heinrich matthaei’s contribution to our current understanding of the genetic code?
a.) discovery of codons
b.) discovery and extraction of dna
c.) creation of a model of dna
d.) creation of photo 51

Use this dichotomous key for insect identification to identify the insect shown. 1. a. insect has one pair of wings. order diptera b. insect has two pairs of wings. go to #2 2. a. front wings thicker in texture than hind wings go to #3. b. front and hind wings are same texture throughout. go to #4 3. a. front wings are short order dermaptera b. front wings cover entire abdomen order coleoptera 4. a. wings with scale on all parts of their area. order lepidoptera b. wings without scales go to #5. 5. a. hind wings smaller than front wings. order ephemeroptera b. front and hind wings nearly equal in size. order odonata the insect pictured is in the order diptera. ephemeroptera. coleoptera. odonata.

Which situation is an example of not doing work? lifting a couch throwing a baseball running up stairs carrying a box

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes