Question

1. which of the following best describes simple diffusion?

a. the movement of small molecules from high - to low - concentration through the phospholipid bilayer
b. the engulfing of large particles by the cell membrane
c. the movement of water molecules through a semi - permeable membrane
d. the movement of molecules against their concentration gradient using energy

1. how does aneuploidy arise from mitosis failure?

a. by an unequal distribution of chromosomes between daughter cells
b. by the formation of extra centrosomes
c. through the uncontrolled division of cytokinesis
d. through the overproduction of spindle fibers

1. which protein type is specifically involved in facilitated diffusion?

a. atp synthase
b. aquaporins
c. enzymes
d. channel proteins

1. which molecules can pass through the phospholipid bilayer via simple diffusion?

a. proteins
b. large polar molecules like glucose
c. ions like sodium and potassium
d. small nonpolar molecules like oxygen and carbon dioxide

1. what is the primary purpose of mitosis in multicellular organisms?

a. to boost genetic diversity
b. to remove waste products from the cell
c. to produce two genetically identical daughter cells
d. to generate energy for the cell

1. what is the significance of the nuclear envelope disintegrating during prophase?

a. it allows the nucleus to divide into two
b. it marks the end of interphase
c. it permits spindle fibers to access chromosomes
d. it triggers the cell to enter cytokinesis

1. what is the main source of energy for active transport?

a. oxygen
b. atp
c. glucose

Explanation:

1. Simple diffusion is the movement of small non - polar molecules from high to low concentration through the phospholipid bilayer. Option a describes this correctly.
2. Aneuploidy arises from nondisjunction during cell division which is due to an unequal distribution of chromosomes between daughter cells.
3. Channel proteins are specifically involved in facilitated diffusion to allow the passage of certain molecules across the membrane.
4. Small nonpolar molecules like oxygen and carbon dioxide can pass through the phospholipid bilayer via simple diffusion.
5. The primary purpose of mitosis in multicellular organisms is to produce two genetically identical daughter cells for growth, repair, and asexual reproduction.
6. The nuclear envelope disintegrating during prophase allows spindle fibers to access chromosomes for proper segregation.
7. ATP is the main source of energy for active transport as it provides the energy needed to move molecules against their concentration gradient.

Answer:

1. a. The movement of small molecules from high to low concentration through the phospholipid bilayer
2. a. By an unequal distribution of chromosomes between daughter cells
3. d. Channel proteins
4. d. Small nonpolar molecules like oxygen and carbon dioxide
5. c. To produce two genetically identical daughter cells
6. c. It permits spindle fibers to access chromosomes
7. b. ATP