In what way are prokaryotic and eukaryotic cells different?
a. A prokaryotic cell does not have cytoplasm, but a eukaryotic cell does.
b. A prokaryotic cell does not have a nucleus, but a eukaryotic cell does.
c. A prokaryotic cell does not have genetic material, but a eukaryotic cell does.
d. A prokaryotic cell does not have a flagellum, but a eukaryotic cell does.
Ans: d. A prokaryotic cell does not have a flagellum, but a eukaryotic cell does.
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Which of the following is not a characteristic of a transformed cell?
A. Alterations in chromosomes B. Decreased growth rate C. Changes in cell surface molecules D. Viral nucleic acid integrated into host DNA E. Capacity to divide indefinitely
Which is incorrect about the bases in nucleic acids?
A. Purines always pair with pyrimidines. B. The large bases are the purines. C. A = T and G = C. D. Hydrogen bonds form between base pairs. E. The purines are thymine and cytosine.
How do endocrine hormones affect their target cells?
A) They cause changes in cell metabolism only. B) They increase the permeability of the target cell. C) They stimulate the synthesis of glycogen. D) They cause changes in cell metabolism and/or gene transcription. E) They affect gene transcription only.
In the staphylococcus aureus, all of the following are cell wall virulence factors EXCEPT
A. Superantigen exotoxins B. capsule C. Protein A D. Fibronectin-binding protein