What does a positive result mean?
What will be an ideal response?
Answer: That nitrite is not present in the medium and that zinc dust must be added to determine if the organism is nitrate negative or if the organism has reduced the nitrate to nitrite and then reduced to nitric oxide, nitrous oxide or nitrogen (will not react to nitrate reagents)
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Which statement accurately describes the relationship between RNAi, small interfering RNA (siRNA), and miRNA?
a. They all describe different methods of post-translational gene regulation. b. miRNAs are classified into two types: RNAi molecules and siRNAs. c. RNAi occurs in two ways: by miRNAs or by siRNAs. d. RNAi is accomplished by siRNA and miRNA, but only siRNAs are cleaved by dicer proteins. e. miRNAs are transcribed from viruses while siRNAs are transcribed from nuclear DNA; both are types of
The ____ of a bird's digestive system contains sand and rocks to aid in mechanical digestion
a. crop b. esophagus c. gizzard d. intestine e. mouth
The obvious advantage of the lactose operon is that it
a. allows bacteria to survive in the presence of lactose. b. eliminates the need for lactose-metabolizing enzymes when lactose is not present. c. enables bacteria to make lactose only in the presence of the proper enzymes. d. negates the need for milk in the diet of adult humans. e. enables glucose to substitute for lactose in the diet of lactose intolerant persons.
A group of living things whose members can successfully breed with one another is called a(n) ________
Fill in the blank(s) with correct word