Question 1 (true/false worth 1 points)

genes are the basic and fundamental part of heredity.

true
false

question 2 (true/false worth 1 points)

mtdna is transferred along maternal lineage.

true
false

question 3 (true/false worth 1 points)

dna analysis has little to offer forensic science.

true
false

question 4 (true/false worth 1 points)

dna may be found on the handle or tip of a baseball bat if it is used in a crime.

true
false

question 5 (true/false worth 1 points)

the repeated segments on the dna strand are called vntrs.

true
false

question 6 (true/false worth 1 points)

dna samples should be stored in airtight containers to prevent contamination.

true
false

question 7 (true/false worth 1 points)

dna testing was commonly used in forensic science beginning in the 1920s.

true
false

1.True 2. True 3. False 4.True 5. True 6. False 7. False

Explanation:

Genes are formed from DNA and are basic and fundamental part of heredity. Thus statement is true. The mitochondrial DNA transfers from the mother to the offsprings, this is called maternal inheritance. Thus, mtDNA is transferred along maternal lineage. DNA profiling or DNA analysis plays important role in investigation and used for comparing evidence with suspect. Thus, DNA analysis has little to offer forensic science is false.

DNA may be found on the handle or tip of a baseball bat if it is used in a crime. The evidence is used for DNA analysis. The VNTR are the variable number of tandem repeats are the short DNA sequences. DNA sample never stored in airtight containers to prevent contamination. They are stored at 4°C and -20°C. DNA testing was commonly used in forensic science beginning in the 1980s. Thus, option 1, 2, 4, 5 are true and 3, 6, 7 are false.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.