Which component is a microfilament of the cytoskeleton? A) A B) B C) C D) D E) E

Question

Which component is a microfilament of the cytoskeleton? A) A B) B C) C D) D E) E 14) At which phase(s) is it preferable to obtain chromosomes prepare a karyotype ? A) late anaphase or early telophase B) late early telophase or metaphase C) anaphase D) early telophase E) late telophase The final acceptor of the electron transport chain that functions in aerobic oxidative phosphorylation is A) pyruvate. B) water. C) ADP. D) NAD^+ 16) water passes quickly through cell membranes, because A) it is a small, polar, charged molecule. B) the bilayer is hydrophilic. C) water movement is tied to ATP hydrolysis. D) it moves through aquaporins in the membrane. E) it moves through hydrophobic channels. Which of the following does not occur during mitosis? A) replication of the DNA B) separation of sister chromatids C) separation of the spindle poles D) spindle formation E) condensation of the chromosomes

Explanation / Answer

13) C) C

Microfilaments are two twisted chains of protein called actin. It can contract, causing movement. Muscle Cells have many microfilaments.

14) B) Late prophase and metaphase

Karyotyping of their chromosomes occur in metaphase or at the end of prophase.

15) E) Oxygen

Oxidative phosphorylation is the process in which ATP is formed as a result of the transfer of electrons by a series of electron carriers. This process, takes place in mitochondria, is the major source of ATP in aerobic organisms.

16) D) It moves through aquaporins in the membrane

The passage for passing water molecule is small and uncharged molecules can pass through the membrane. Water is a charged molecule, so it cannot get through the lipid part of the bilayer. In order to allow water to move in and out, cells have special proteins that act as a doorway. These proteins are called aquaporins.

17) A) Replication of the DNA

DNA replication occurs during the S phase of the cell cycle not during mitosis.

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