Biramous appendages in arthropods are only present in which organism?
a. insects
b. arachnids
c. centipedes
d. crustaceans
e. horseshoe crabs
d
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During cell fractionation, the ____ cannot be isolated since it is destroyed when intact cells are lysed
a. lysosomes b. mitochondria c. plasma membrane d. proteins e. nucleic acids
The DNA sequence 5? ATGGGGGACACC 3? encodes the amino acids Met Gly Asp Thr. A mutation changes the sequence to 5? ATGGGGAACACC 3? that encodes the amino acids Met Gly Asn Thr. What type of mutation has occurred?
A) frameshift mutation B) missense mutation C) silent mutation D) nonsense mutation
What explanation can you give for why the sodium-potassium pump does not run out of ions to move in or out of the cell?
A. The cell continuously produces more ions to replace those moved by the pump, maintaining a constant supply. B. Leak channels are always open, allowing the passage of sodium ions (Na+) and potassium ions (K+) across the membrane. C. Many of the ions moved in or out then diffuse passively back through the membrane in the opposite direction.
Which description(s) correspond to class Prokaryote in order to test your understanding of the characteristics of prokaryotes, eukaryotes, and viruses.
> Must be viewed with an electron microscope > Acellular particle > Size range: 10-200nm > Cell type that lacks a nucleus > Contains a nucleus and other membrane-bound organelles > Size range: 1-10?m