How many kingdoms are there in the most current tree of life?
A.) Three
B.) Two
C.) Six
D.) Five
Ans: C.) Six
You might also like to view...
The comet exploring Rosetta spacecraft, Philae, reports back the presence of single-celled organisms that resemble bacteria found on the comet C-G. A module from the spacecraft containing a sample of the organism is rocketed back to earth
Amazingly, the comet organism can be grown in the lab. It is determined that DNA and RNA and proteins arepresent in the comet organism, but that four of the nitrogenous bases are different from terrestrial nucleotides. The comet organism's nitrogenous bases are named A, B, C, and D. Comet organism proteinswere found to contain only the 20 amino acids regularly found as components of terrestrial proteins. You are askedto decipher the genetic code of this comet organism. You synthesize three polyribonucleotides consisting of various combinations of A, B, and Cnitrogenous bases,and determine the amino acid sequence of any proteins synthesizedduring comet-organism cell-free in vitro translation. The results are shown in the table below: Polynucleotide sequence Amino acid sequence of polypeptide(s) 5' BCBCBCBCBCBC….. 3' …..GLY-ILE-GLY-ILE-GLY-ILE….. 5' BBCBBCBBCBBC….. 3 ' …..GLY-GLY-GLY-GLY-GLY….. …..ASN- ASN- ASN- ASN- ASN….. …..TYR-TYR-TYR-TYR-TYR….. 5'ABBCABBCABBCABBC….. 3' …..LYS-THR-VAL-TYR-LYS-THR-VAL-TYR….. If the genetic code of the comet organism is a triplet, nonoverlapping code with no commas, what is the codon for asparagine? A. BBC B. BCB C. CBB D. BBB
Substrate activation may involve
A) a change in enzyme conformation induced by substrate binding. B) accepting protons from the enzyme. C) formation of temporary covalent bonds. D) donation of protons to the enzyme. E) all of the above
This type of cell is closely associated with a companion cell
a. sieve tube member b. tracheid c. vessel elements d. sclerenchyma e. collenchyma
What is the correct sequence of air flow in mammals?
a. nasal cavities, larynx, pharynx, bronchi, trachea b. nasal cavities, pharynx, bronchi, larynx, trachea c. nasal cavities, pharynx, larynx, trachea, bronchi d. nasal cavities, larynx, pharynx, trachea, bronchi e. nasal cavities, bronchi, larynx, trachea, pharynx