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OleMash [197]
3 years ago
14

Scientists were able to determine the age of the earth from rock samples that were analyzed.

Biology
1 answer:
Margaret [11]3 years ago
3 0
A. Radiometric dating
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Forensic scientists are trying to find an exact dna match to a sample left at the scene of a crime. the sample from the crime sc
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Forensic science utilizes particular sequences of DNA that are unique to people and are cut differently by restriction enzymes. These  techniques are referred to as Restriction Fragment Length Polymorphism (RFLP) and the Short Tandem Repeat (STR) Analysis. In this case, there is an exact match on the crime sample and that of the suspect.






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3 years ago
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Two umbilical arteries leave the __________ of the fetus, enter the umbilical cord, and deliver blood to the placenta.
Aloiza [94]

Answer:

internal iliac arteries

Explanation:

6 0
4 years ago
Both a solar eclipse and a lunar eclipse involve the alignment between the Sun,
Elanso [62]

Answer:

The position of the Moon and Earth are different.

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7 0
2 years ago
Describe how restriction enzymes and ligase enzymes are used to make the plasmids that are introduced to bacteria cells during t
balandron [24]

Answer:

DNA restriction enzymes cut the DNA molecule, while DNA ligases join the resulting DNA fragments

Explanation:

Transformation is a naturally occurring process by which bacteria incorporate exogenous genetic material from their surrounding environment. This process (transformation) is used for DNA cloning via plasmid vectors. In DNA cloning, transformation occurs after restriction enzymes cut the DNA at specific sequences named palindromic sequences (i.e, sequences that can be read the same in opposite direction). Restriction enzymes can generate sticky-ends, where enzymes make staggered cuts in the two strands (e.g., <em>BamH</em>), or blunt ends, where the resulting strands are of the same length (e.g., <em>HaeIII</em>). In general, sticky-end enzymes are more useful because they generate a 3' overhang in one molecule and a complementary 5' overhang in the other, increasing the yield and specificity of ligation. During ligation, a DNA ligase is used to join both DNA strands by forming phosphodiester bonds in the plasmid. Following transformation, bacteria can be selected on antibiotic plates.

8 0
3 years ago
Which one of the "big 3" macronutrients is the most calorically dense at 9 calories per gram?
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<span>Fat is by far the most calorie loaded of the macronutrients, containing 9 calories per gram compared to only 4 calories per gram for proteins and carbohydrates. Although a low fat diet is generally desirable for persons who would like to restrict their caloric intake, a no fat diet is no recommended by nutritionists or doctors since there is a dietary need for some fat in the diet.</span>
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3 years ago
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