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Whitepunk [10]
2 years ago
14

Because plant cells contain both mitochondria and chloroplasts, but animal cells only contain mitochondria, it is thought that e

arly cells gained mitochondria first, before chloroplasts.
True / False.
Biology
1 answer:
Fantom [35]2 years ago
5 0

Answer:

Chloroplast is crucial for photosynthesis not mitochondria...

Explanation:

Chloroplast isn't found in animal cells not because of it's evolutionary choice but because of it's rather different way of energy production. Chloroplast is modified by nature to produce energy using photons or photosynthesis that can only occur in plants but mitochondria does not used photons. It utilizes electron transport chain strategy instead.

Animals would never be able to make their surfaces photosensitive for photosynthesis to occur and produce energy with the help of chloroplasts.

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A plasmid contains the gene for tetracycline resistance and a lacz gene that has a restriction site in it. Foreign dna has the s
tester [92]

Answer:

The colonies are carrying the resistance genes from plasmids

Explanation:

Bacteria can acquire beneficial characteristics that they didn’t have. One way for these is through plasmids, which ones are little fragments of DNA that usually contains resistance genes (for antibiotics, disinfectants, heavy metals, etc.) or other capacities, like the ability to use some substances (for example sugars).

In this specific situation, we already know that the plasmid carrying genes for tetracycline resistance and the <em>lacZ</em> gene.  

A little explanation:

Tetracycline is an antibiotic that inhibits bacterial growth and kills the bacteria.  The bacteria can “fight” to this antibiotic if it has a resistant gene, the result is that the antibiotic can’t affect the bacteria and survive.  An analogy is like a Police Officer (bacteria) that have a bulletproof vest (tetracycline-resistant gene) so the bullets (tetracycline) didn’t affect the police.

In the case of X-gal, is a compound consisting primarily in one sugar called galactose. Not all bacteria can eat galactose, they need an enzyme called β- galactosidase (comes from <em>lacZ</em> gene) that helps the bacteria “eat” the sugar (cuts the sugar in little pieces so the bacteria can eat).  

Then, as the bacterial colonies can grow in the medium with tetracycline and X-gal,  we know that those bacteria are carrying the resistance genes for tetracycline (does not affect the bacteria) and the <em>lacZ</em> gene (bacteria produce β- galactosidase that cuts galactose). These genes are coming from the plasmids because we already know that the plasmid carries these genes and not from the exogenous DNA.  

7 0
2 years ago
2 points
rjkz [21]

Answer:

Option B

Explanation:

The presence of these structures in this stage may be a prediction of a common ancestor as these structures are not gills because they do not develop into gills in chicks and humans but being so similar to gill structures in fish at this stage in their embryo suggests that chicks and humans share a common ancestor with fish.

5 0
3 years ago
Isabel's first car had a manual stick shift. After many years of driving an automatic car, she needs to use her sister's car, wh
ankoles [38]

Answer:

Procedural memory

Explanation:

Isabel has to recall the information about using a manual stick shift. For this reason, she is using long-term, explicit, declarative and episodic memory system.

Human memory system can be broadly classified as: sensory memory, short-term memory and long-term memory.

Long-term memory is used to recall information. If the information are about facts, events and experiences then explicit, declarative and episodic memory helps to recall all information. This will help Isabel to recall all information about driving a car with a manual stick shift and she will be able to drive her sister's car.

(Answer taken from brainly.com/question/11839849)

7 0
2 years ago
Robin is swinging back and forth from a trapeze. In which of the following situations in his kinetic energy being transformed in
dalvyx [7]

Answer:

When he is swinging back up on the trapeze.

Explanation:

When he is swinging down, all the kinetic energy is being used. Once he begins his ascent, immediately after the halfway point, potential energy builds up once again.

5 0
3 years ago
Read 2 more answers
How did Mendel make the F1 generation plants
ivolga24 [154]
100% of the plants express the dominant trait
6 0
2 years ago
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