Seawater is considered buffered due to the presence of:
a. oxygen ions.
b. nitrogen ions.
c. bicarbonate ions.
d. silicon ions.
e. calcium ions.
C
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Which of the following distinguishes bacterial
flagella from those of eukaryotes? a. number per cell and structure b. structure and mechanism of movement c. function and mechanism of movement d. number per cell and mechanism of movement e. number per cell and function
The first life on Earth was probably most similar to modern-day
A. bacteria. B. protists. C. Archaeans. D. plants. E. fungi.
Suppose that the first part of a new polypeptide chain being produced in a eukaryotic cell has a signal peptide. Where would this polypeptide be located within the cell as it is maturing?
a. first in the rough ER, and then in the Golgi apparatus b. first in the cytoplasm, and then in the rough ER c. in the cytoplasm only d. in the Golgi apparatus only
Which of the following statements regarding the Golgi apparatus is false?
A) The Golgi apparatus works closely with the endoplasmic reticulum. B) The Golgi apparatus serves as a molecular warehouse and finishing factory. C) The Golgi apparatus decreases in size when a cell increases its protein production. D) The Golgi apparatus modifies chemicals received from the endoplasmic reticulum.