Question

1. Which of the following statements are true?
a. since all cells carry out cellular respiration, they contain mitochondria
b. a cell cannot be subdivided into smaller units that maintain the living state
c. plant cells contain chloroplasts and no mitochondria while animal cells contain mitochondria and no chloroplasts.
d. the cell membrane's function to prevent diffusion of any substances into or out of the cell.

2. A biologist discovers a new unicellular organism and classifies it as a prokaryote. The cell is very small, contains a cell membrane, a cytoplasm, DNA in a nucleus, and no other cell organelles. Which statement below represents a correct response to the biologist’s discovery and classification?
The organism is a prokaryote, because it lacks cell organelles such as mitochondria, Golgi apparatus, and endoplasmic reticulum.
The organism is a prokaryote, because it is so small and simple in structure.
The organism is a eukaryote, because it has a nucleus.
The organism is a eukaryote, because it has a cell membrane, a cytoplasm, and DNA.


What would most likely happen to cells placed in fresh water?
a.water would flow out of them because they are hypotonic to the external environment
b water would flow into them because they are hypotonic to the external environment
c.water would flow out of them because they are hypertonic to external environment
d.water would flow into them because they are hypertonic to external environment

Answer 1

Your answers would be:

1. ---- B. A cell cannot be subdivided into smaller units that maintain the living state.

2. ---- The organism is a eukaryote because it has a nucleus.

3. ---- D. Water would flow into them because they are hypertonic to external environment.

If you want to know why:

1. The cell is the basic unit of life or in other words, its the smallest unit that makes up a living thing. It does not subdivided further if you are talking about sustaining life. Yes, it is made up of smaller units of organelles, but these organelles work together as a single unit (as a cell), to do life sustaining processes.

2. The organism is a eukaryote because of the presence of a nucleus. This is one of the main features of a eukaryote that differentiates it from a prokaryote. Prokaryotes to not have a true nucleus.

3. Water would flow into them, causing the cell to swell and eventually burst if the concentration of solutes would not even out before then. The process of osmosis is what brings the water into the cell. The cell would have a higher solute concentration than freshwater. Through osmosis, the water would then go to the area of higher concentration, which would be the cell.