What turn combined with carbon dioxide and the sun's energy produce____

An element has a half-life of 30 years. If you start with 10g of this element, how many grams of this element would remain after

drek231 [11]

After two half-lives or 60 years, 7.5 g of the element will be left.

Explanation:

Half-life:

In simple words, Half-life can be defined as the amount of time needed for a quantity to fall to half its value as contained at the beginning of the time period.
In this problem the half-life of the element is thirty years, then after thirty years half of the sample would have decayed and half would be left as it is.
After thirty years (The first half-life ) 30 /2 = 15 g declines and 15 g remains disappeared.
And after another sixty years (The two half-lives) 15 /2 = 7.5 g declines and 7.5 g remains disappeared.
After two half-lives or 60 years, 7.5 g of the element will be left.

3 0

4 years ago

Scientists have evidence that meteorites have come from which option of locations?

Step2247 [10]

Mars and Moon are the locations from which meteorites would come.

Option (c);

EXPLANATION:

The meteorites found on Earth look like martian crystal rocks.
These might be first ejected into space during a collision of an asteroidal object with Moon or Mars and then it got into the Earth orbit because of the force produced during the collision.
There are around seventy meteorites recognised to have come from the planet Mars till up to the present date.
There are three types of meteorites such as Martian meteorites and a sample of two lunar meteorites.
To identify the origin of the meteorite, the scientist tries to identify the type of rock followed by analysing the chemical composition and then try to identify its age.

8 0

3 years ago

A biochemical test, in the microbiology world, is used to determine

jasenka [17]

in the microbiology world, is used to determine O Capability of a microbe to perform a specific enzymatic activity. O Staining characteristics. O Nucleic acid-base composition of DNA sequences.

8 0

2 years ago

A seismograph records an earthquake, but scientists do not feel it. The earthquake has a magnitude _____.

kvv77 [185]

It would be D because would be small and you wouldn't feel it. For answer A, the scientist could feel it. For answer B, you can kind of feel it or feel it. For C, It can definitely feel it. So the answer would be d.

8 0

3 years ago

Read 2 more answers

Indicate whether each of the following statements is true of depurination (DP), deamination (DA), or pyrimidine dimer formation

solniwko [45]

Answer:

- This process is caused by spontaneous hydrolysis of a glycosidic bond: depurination and deamination

- This process is induced by ultraviolet light: pyrimidine dimer formation

- This can happen to guanine but not to cytosine: depurination

- This can happen to thymine but not to adenine: pyrimidine dimer formation

- This can happen to thymine but not to cytosine: none

- Repair involves a DNA glycosylase: deamination

- Repair involves an endonuclease: depurination, deamination and pyrimidine dimer formation

- Repair involves DNA ligase: depurination, deamination and pyrimidine dimer formation

- Repair depends on the existence of separate copies of the genetic information in the two strands of the double helix: depurination, deamination and pyrimidine dimer formation

- Repair depends on cleavage of both strands of the double helix: none

Explanation:

Depurination is the loss of purine bases (either adenine or guanine), while deamination refers to the removal of an amino group. During depurination, a β-N-glycosidic bond is cleaved by hydrolysis and a nucleic base is released (either adenine or guanine). All DNA bases may undergo deamination, except thymine (since thymine does not have an amino group). The ultraviolet (UV) radiation can cause thymine or cytosine to form dimers (e.g., pyrimidine dimers), being thymine dimers the most common lesion when DNA is exposed to UV light. Pyrimidine dimers may be repaired by different excision mechanisms, e.g., nucleotide excision repair, where the recognition of the DNA damage leads to the removal of the DNA fragment containing the lesion. DNA glycosylases are enzymes involved in the mechanism of base excision, these enzymes recognize and remove damaged bases by hydrolysis of the glycosidic bond, producing an abasic (apurinic and apyrimidinic) site. A DNA ligase enzyme covalently joins two DNA molecules by forming a phosphodiester bond, which is required during these processes.

8 0

3 years ago

What turn combined with carbon dioxide and the sun's energy produce_____.