Which of the following best describes the characteristics and function of sirna?
a a short strand of rna that can complement and inactivate a sequence of mrna
b. a short strand of rna that can act as a transcription factor to initiate transcription
c a strand of dna that can bind to and inactivate an mrna sequence
d. a trna that is not able to attach to a ribosome and therefore inhibits the process of translation

Why does it matter if osmosis is put into a “scab” or a “nosebleed? ” where would that leave him?

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.

What's wrong with this ecological pyramid? (multiple choice)1. secondary consumers should be at the bottom of the pyramid2. the sun has an arrow leading to decomposers 3. primary consumers should come after the sun4. energy retained should increase from the bottom to the top5. the sun should be at the bottom of the pyramid