Which is not a characteristic of Helicobacter pylori?
A. Produces urease to buffer stomach acidity
B. Gram-negative
C. Produces enteroxin that causes diarrhea
D. Lives in the stomach
E. Curved rods
Answer: C
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With minor exceptions, the genetic code
a. is the same for all living organisms and viruses. b. is specialized so that viruses have a different code from all living organisms. c. differs between different organisms and viruses. d. is the same for all viruses and for single-celled organisms, but is more complex in multicellular organisms. e. has three versions: one for viruses, one for single-celled organisms, and one for multicellular organisms.
Sharks differ from most other fish in that they lack ____
a. gill slits b. scales c. bone d. paired appendages e. teeth
In horses, black coat color is influenced by the dominant allele (B), and chestnut coat color is
influenced by the recessive allele (b). Trotting gait is due to a dominant gene (T), pacing gait to the recessive allele (t). If a homozygous black trotter is crossed to a chestnut pacer, (a) what will be the appearance of the F1 and F2 generations? (b) which phenotype will be the most common? (c) which genotype will be the most common? (d) which of the potential offspring will be certain to breed true? What will be an ideal response?
Where is the genetic information of the cell stored?
a. lysosomes b. smooth endoplasmic reticulum (ER) c. nucleus d. Golgi apparatus e. rough endoplasmic reticulum (ER)