Today in class, a student asked whether the positive charge of the presequence of proteins being imported into the mitochondria was inhibitory for entry into the intermembrane space because of the positive charge present in this compartment of the mitochondria. How do proteins get past this? Wouldn't the net positive charge be inhibitory to import through the TOM complex?

Answers

Answer 1
Answer:

Answer:

Mitochondrial proteins enter the organelle through channels formed by membrane proteins present in its inner and outer membranes.

Explanation:

All the biological membranes have lipid bilayer with the non-polar core that does not allow entry of charged and large substances. Mitochondrial proteins are synthesized in the cytosol and the unfolded proteins bind to the chaperons that deliver them to the receptors present in the outer mitochondrial membrane.

The receptor moves the protein to the membrane channels formed by integral membrane proteins of inner and outer mitochondrial membranes. The proteins enter the intermembrane space and are targeted to the inner membrane through channels while chaperons are left outside only.


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A student conducts an experiment to determine how the amount of water given to a plant affects its growth. What is the dependent variable for this experiment? a. the amount of water b. the height of the plant c. the amount of sunlight d. the amount of soil Please select the best answer from the choices provided

For a molecule to be considered organic what elements must be present? A. Carbon only B. Oxygen and hydrogen C. Carbon and hydrogen D. Carbon and oxygen

Answers

For a molecule to be considered organic elements must be present in  Carbon and hydrogen. The answer to your question would be letter C. These are use in order to create an element which is further used all living organisms in living.
for a molecule to be organic, it has to contain a backbone of carbon and some hydrogen so the answer would be C. 

Pls i’m getting timed :(

Answers

Answer:

i think conversion of mass

Explanation:

The aerobic phase of cellular respiration in the mitochondrion produces a net of about 28 to 30 ATP molecules. How does this compare to the energy that is just released in glycolysis?

Answers

Answer:

The aerobic phase produces a net of 28-30 ATP.  

Explanation:

because you are using more oxygen.

A scientist added bacteria and a nutrient medium that could support the growth of the bacteria to a sterilized petri dish. No other materials were added.The graph models growth of the bacteria over time.
Bacterial Population
Time
Which of these most likely explains why the bacterial population stopped growing?
The bacteria mutated from photosynthetic to carnivorous organisms and consumed one another until all the individuals were dead.
The bacteria reproduced in the system but eventually died due to limited resources
The bacteria became diseased and were unable to survive in the closed system
The bacteria competed for nutrients and died after all the nutrients were consumed

Answers

The statement that most likely explains the stop of bacterial populations to grow is the bacteria competed for nutrients and died after all the nutrients were consumed.

What do you mean by Bacterial Growth?

Bacterial growth may be defined as the proliferation of bacterium into two daughter cells, in a process called binary fission.

When there are enough nutrients in the petri dish, a rapid increase is shown in the graph, but during the course of time when nutrients become limited, it affects the growth of the bacterial population.

Therefore, the statement that most likely explains the stop of bacterial populations to grow is the bacteria competed for nutrients and died after all the nutrients were consumed.

To learn more about Bacterial growth, refer to the link:

brainly.com/question/17817006

B - The bacteria competed for nutrients and died after all the nutrients were consumed

Scientists today can use many investigative methods to study evolution. Which method was developed after Darwin'stime?
O DNA comparisons
o observations
O comparison of fossils
O experimentation

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Answer:

DNA comparisons

Explanation:

The molecular nature of DNA and its role in inheritance and evolution was not known during Darwin's time.  Therefore, it was not possible to compare similarities in DNA sequences between different species to understand their evolutionary relationships.  

This type of method was not in regular use until the 1980s/1990s, when sequencing and DNA amplification technologies were invented

If a cat with long black hair (Llbb) is crossed with a cat with short hair (llbb). What is the possibility that an offspring will have long black hair or short hair?

Answers

Answer:

50% long black hair and 50% short hair

Explanation:

Attatched is a screenshot of a punnett square that shows the possibilities of the offspring having long or short hair. In short, the genetics of long black hair only need one big "L", while the genetics of short hair need to have 2 short "l"s. So when we draw the punnett square and combine the genetics, we get 50% have Llbb, and 50% have llbb