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shepuryov [24]
3 years ago
12

If the rice already had the genes that could make vitamin A, why did scientists use genes from other organisms?

Biology
1 answer:
meriva3 years ago
7 0

Answer:

A. The rice genes didn't make the right type of vitamin A.

Explanation:

Regular white rice does not have the gene to produce beta carotene. The human body converts the beta carotene into vitamin A.

To increase the nutritional value of rice, the gene for beta carotene from daffodil flowers was inserted into the cells of endosperm of rice.

This allowed these cells of the genetically engineered rice varieties to produce beta carotene. Production of beta carotene imparted golden color to the rice grain and hence, the name.

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Why is there chloroplasts in leaf cells but not root cells?
Scilla [17]

Answer:

Chloroplasts are only found in the parts of the plant that are capable of photosynthesis. The majority of chloroplasts are found in the leaves of the plant because these structures have the greatest surface area for absorption. The outer part of a plant stem may also contain chloroplasts.

Explanation:

8 0
3 years ago
Read 2 more answers
Which Mimulus species would you categorize as mainly asexual reproducers? Why? A. M. rupestris and M. eastwoodiae; they put more
nekit [7.7K]

Answer: C. M. rupestris, M. eastwoodiae, and M. nelsonii; they put more energy into making rooted branches than they put into making nectar and seeds.

Explanation:

In asexual mode of reproduction the plant does not produce gametes. The plant reproduce through vegetative propagation or spore formation. The plant does not produce nectar as no flowers are produced to attract the pollinators.

In sexual mode of reproduction the plant will develop the gametes and flowers will produce the nectar to attract the pollinators.

Thus on the basis of above explaination, C is the correct option. As the plants will invest more energy in making roots which are the organs for vegetative propagation a process of asexual reproduction.

6 0
3 years ago
A student analyzed a viral genome and found that the genome had the following nucleotide composition. 28% adenine 20% thymine 35
egoroff_w [7]

Answer: Option A) Double-stranded DNA

Explanation:

First, the presence of thymine infers that the genome is DNA.

Then, to determine whether it is single or double stranded, we check if the sum of all nitrogenous bases is equal to 100%

A + C + G + T = 100%

28% + 35% + 20% + 17% = 100%

Since all bases makes 100%, we can conclude that the genome is a double stranded DNA

7 0
3 years ago
Read 2 more answers
1 Point
igomit [66]
I think it’s D bc it’s talkin about fossil fuels
5 0
3 years ago
Where do homologous chromosomes exchange genetic material through crossing over?
zvonat [6]

Answer: C) Centromeres

Explanation: Centromeres are involved in crossing over, none of the other ones are.

8 0
3 years ago
Read 2 more answers
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