Question

in cardiac 5. Cell-cell communication junctions in plants are called and muscle cells (animal). A. plasmodesmata, anchoring junction B. plasmodesmata gap junction C. stomata; anchoring junction D. stomata; conjunction junction Estomata; gap junction 6. Actin is found in A. cellulose B. intermediate filament C.microfilament D. microtubule E. cristae 7. Based on the endosymbiont theory which was once a free living prokaryote? A. nucleus B. Golgi C. Mitochondria D. rough endoplasmic reticulum E. B and D 8. Active transport A. occurs along the concentration gradient C. is an example of osmosis B. requires energy D. is facilitated diffusion 9. Hydrolysis of ATP to pump sodium out of the cell is an example of A. chemical work B . mechanical work c. transport work D. Pilates 10. Which type of molecule most easily crosses a plasma membrane without assistance? A small non-polar molecules B. small polar

Answer 1

Ans 5 B- plasmodesmata, gap junction

Plasmodesmata are present in plants that are involved in the transport of ions or small molecules from one cell to another cell whereas gap junctions are present in an animal cell.

Ans 6 D- microfilaments

Microfilaments are polymers of actin.

Ans 7 C - mitochondria

Mitochondria and chloroplast are considered as free-living prokaryotes according to endosymbiotic theory. These organelles have their own genome which is circular ds DNA like prokaryotes.

Ans 8 B - requires energy

In active transport, energy is required to move a solute against its concentration gradient.

Ans 9 C- transport work

The energy released by hydrolysis of ATP is used to transport the solute is an example of transport work.

Ans 10 A - small nonpolar molecules

Ans 11 D- lowering activation energy

Activation energy acts as a barrier for the reaction, enzymes work by lowering this activation energy.

Ans 12 B - water channels

Aquaporins are integral membrane proteins that are involved in the transport of the water.

Ans 13 B - hydrolysis of ATP

Energy is released when a phosphoanhydride bond of the ATP is broken.

Ans 15 D - increase, decrease

Folding of the plasma membrane increases the ratio of surface area to volume.

Ans 16 D- active site

The substrate can bind at the active site of the enzyme where a chemical reaction takes place.

Ans 17 C - mitochondria

Mitochondriaares is known as the powerhouse of the cell which is involved in the synthesis of the ATP.

Ans 18 A - Rough Endoplasmic Reticulum

RER contains bound ribosomes which are involved in the synthesis of proteins

Ans 19- High, low

In diffusion movements of solutes take place from high concentration to low concentration.

Ans 20 E - do all these things

defines inside and outside of the cell, and organelles, organize the cell,

Ans 21D- requires energy

In exergonic reactions, energy is released into the surroundings whereas in endergonic reactions energy is required from the surrounding.

Ans 22 C - cellulose

The plant cell wall is composed of cellulose which is a polymer of glucose.