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nirvana33 [79]
3 years ago
5

Plant cells have These organelles convert sunlight to energy.

Biology
1 answer:
Svetradugi [14.3K]3 years ago
3 0

Answer:

b Chloroplast l........

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Give one example of a question that science could test. Then, explain in your own words why it is an example of a scientific que
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Does the time taken to travel a set distance increase as speed increases?

This is an example of a scientific question because it can be answered through an experiment and data analysis.
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A plant with round seeds is crossed with a plant with wrinkled seeds. Draw a Punnett square to predict the outcome
astraxan [27]

Answer:

Explanation:

A cross between plants with round seeds (RR) and plants with wrinkled seeds (rr).  If both parents are homozygous, having one type of gamete each, i.e. R from round seed parent and r from wrinkled seed parent (RR X rr).

    R     R

r   Rr     Rr

r   Rr     Rr

All the offspring of generation would be round with genetic constitution Rr. They will be heterozygous plants having two different alleles.  

If both parents has heterozygous round seeds with genotype Rr. So, we have Rr × Rr. The gametes produced from each of the parents are of two types, R and r.

   

     R      r

R    RR    Rr

r     Rr      rr

The generation has a genotypic ratio of 1 RR : 2 Rr : 1 rr. The phenotypic ratio is 3 round : 1 wrinkled.

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3 years ago
Until about __________ years ago, humans acquired virtually all of their food through foraging.
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In the absence of glucose and the presence of lactose, where is the lac repressor bound?.
garik1379 [7]

In the absence of glucose and in the presence of lactose, the lac repressor is bound to the allolactose, and the lac operon can start.

<h3>What is the lac operon?</h3>

A lac operon is an inducible operon that is activated in the presence of lactose in the outer surroundings of the bacteria. Operon is a series of genes present in the bacterial DNA.

When the lactose is present, the repressors move to bind the allolactose, and as a result, the RNA polymerase can access the lac operon. The repressor has more affinity for allolactose than the operator. RNA polymerase, along with cAMP and CAP proteins, initiates the transcription of lac operon. The transcript has genes for galactosidase, permease, and transacetylase.

Hence, in the absence of glucose and in the presence of lactose, the lac repressor is bound to the allolactose.

Learn more about the lac operon, here

brainly.com/question/2562849

#SPJ1

4 0
1 year ago
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