Question

HELP PLEASE EXPLAIN YOUR ANSWER!!!

1. All eukaryotic cells have a cytoskeleton, including plant cells, which have cell walls as well. What does the cytoskeleton in a plant cell do that the cell wall cannot? (2 points)


It acts as a framework inside the endoplasmic reticulum and keeps it from collapsing.
It helps keep the organelles in place and directs their movement as needed.
It provides energy and helps to move molecules throughout the cell.
It keeps the DNA safely enclosed in the nucleus and holds the nucleus together.

2. Cellular respiration is a series of complicated reactions. Some of the enzymes that are necessary for the reactions to take place effectively are not produced by the body and must be eaten in a person's diet. Which answer correctly explains what happens when a person's diet lacks the necessary enzymes for cellular respiration? (2 points)


The production of ATP will increase as the enzyme decreases.
The cellular respiration reactions will use another available enzyme.
The cellular respiration reaction rate that uses the missing enzyme will increase.
The cell's energy level will diminish as the enzyme decreases.

3. While the average human is able to hold his or her breath for approximately one minute, a whale can dive for over 30 minutes without returning to the surface. Which of the following correctly describes this difference? (2 points)


Whales need less energy than humans.
Whales gather energy from their environment better than humans.
Whales are able to conserve oxygen better than humans.
Whales have cells that produce energy differently than humans.

Answer 1

1. it acts as a framework inside the endoplasmic reticulum and keeps it from collapsing . It helps keep the organelles in place and directs their movement as needed . it keeps the DNA safely enclosed in the nucleus and holds the nucleus together . It provides anchoring places for the cell cytoplasm and help it move molecules.

2. D) The cell's energy level will diminish as the enzyme decreases

3. Whales have cells that produce energy differently than humans.

Answer 2

1. The right answer is It helps keep the organelles in place and directs their movement as needed.

The cytoskeleton provides a certain rigidity to the cell and serves for the fixation of organelles (equivalents for the organ cell for an organism).

The cytoskeleton is constantly reorganized and thus governs the internal movements (displacement of chromosomes for example) and the deformations of its membrane (production of protuberances, invaginations, sites of adhesions ...).

2. The right answer is The cell's energy level will diminish as the enzyme decreases.

Cellular respiration is the set of biochemical reactions leading to the formation of ATP, energy source of the cell.

This mechanism consumes oxygen and creates carbon dioxide as waste. That's why we talk about cellular respiration.

It is the three-step set, glycolysis, the Krebs cycle and the electron transport chain related to oxidative phosphorylation, which lead to the formation of ATP. If these reactions are not assured by lack of enzymes then there will be no production of ATP (energy production).

3. The right answer is Whales are able to conserve oxygen better than humans.

As the duration of the dive of some whale species can reach more than one hour, they use other means to breathe. In vertebrates, myoglobin, a protein, transports and stores oxygen in muscle tissue. It works like hemoglobin that carries oxygen in red blood cells. It is also myoglobin concentration very strong that makes their flesh bright red color, almost black. Thus, whales use the oxygen stored in the muscles to dive for long periods.