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Kazeer [188]
3 years ago
9

A student is scratching a mineral on a white plate in science class. What property is this student testing?

Biology
2 answers:
vredina [299]3 years ago
6 0
D streak:colour of a mineral <span>observed against an unglazed white porcelain plate.</span>
Ksju [112]3 years ago
4 0
D Streak. The student is scratching it on white paper to test the streak.
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Name two types of evidence used to support the theory of evolution. Explain how scientists use each type of evidence to provide
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Evidence for evolution, in other words evidence of common descent, include fossils, which have shown a (fairly) steady change in morphology over time for some species. An example would be horse hooves: we have fossils that show when they were still three toed, then two toed, then one toe in our present day horses. Another piece of evidence is vestigial organs. An example of vestigial organs is wings in some flightless birds, such as the kiwi. Their ancestors used it in order to fly across the marine barrier into New Zealand, but natural selection and random genetic drift made them quickly lose the ability to fly. Nonetheless, they still have their wings, however small. It can be assumed that eventually, their wings would be reduced to small stubs fused to other nearby bones, as has been observed in their cousins.
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3 years ago
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aliya0001 [1]

Answer:

Explanation:

The correct answer is B

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mote1985 [20]
Its d .........................
5 0
3 years ago
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Thylakoids membranes have special proteins in bedded into the membrane which catalyze the production of ATP from what type of io
djyliett [7]

Answer:

From Hydrogen ion.

H+

Explanation:

It's is from hydrogen ion because majoroty of the electrons transport processes take place in the thylakoids membranes in a bid to produced ATP, Hydrogen ion is allow to move through thylakoid space and then backflow through the proteins embedded in the thylakoids membrane called ATP synthase, which produce ATP from ADP in the mitochondrial matrix and chloroplast stroma.

7 0
2 years ago
What would be the effect of a mutation in the coding region of the lactase gene?
Fynjy0 [20]

Lactase refers to an enzyme that can dissociate lactose sugar into glucose and galactose. This enzyme plays an important role in the digestion of milk that comprises high lactose sugar. In case, if a mutation occurs in the gene codon of lactase, then two possibilities can take place. These are as follows:  

1. Loss of mutation: In this case, the person becomes lactose intolerant because of mutation in lactase gene codon. Due to this, there is low mRNA expression and thus low production of the enzyme lactase. This is also known as lactase non-persistent phenotype.  

2. Gain in mutation: In this case, the person gain an increase in mRNA expression of the lactase gene, thus more production of lactase takes place than usual. This kind of individual exhibits lactase persistent phenotype.  


5 0
3 years ago
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