biology PLEASEE HELP ?!?Both sickle-cell anemia and hemophilia
a. are caused by genes coded for defective protein.
b. are seen in homozygous dominant individuals.
c. are diseases of the gastrointestinal system.
d. none of the above.
Which of the following is NOT a benefit of genetic counseling?
a. It helps identify parents at risk for having children with genetic defects.
b. It assists parents in deciding whether or not to have children.
c. It is based exclusively on family pedigrees.
d. It helps identify infants that can be treated for genetic disorders.
Using radioactive tracers to determine the interactions of bacteriophages and their host bacteria, Hershey and Chase demonstrated without question that
a. genes are composed of protein molecules.
b. DNA and proteins are actually the same molecules located in different parts of cells.
c. bacteria inject their DNA into the cytoplasm of bacteriophages.
d. DNA is the molecule that stores genetic information in cells.
The major components of a DNA molecular subunit are
a. a chromosome, deoxyribose, and double helix.
b. a five-carbon sugar, phosphate group, and a nitrogen-containing base.
c. adenine, guanine, cytosine, and thymine.
d. all of the above.
The structure of DNA is held together by
a. purines pairing with pyrimidines.
b. hydrogen bonds between adenine and thymine.
c. attraction between cytosine and guanine.
d. all of the above.
Posted by SOCL@tú
1) B
2) B
3) D - They used phage with a protein coat that surrounds the DNA. When DNA was injected into a cell, a new generation of phage was produced within the cell. It proved that DNA, not the protein coat, contained the genetic material.
4) D - Choice A describes what contains the genetic material. Choice B describes protein found in an amino acid.. Choice C are bases found in the amino acid sequence.
5) D - Purines are adenine & guanine. Pyrimidines are cytosine, thymine, and uracil.
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