Which of the following statements best supports the hypothesis that viruses can cause cancer?

A. Cellular DNA has sequences related to viral sequences.

B. Cancerous and normal cells share genetic sequences.

C. Viruses and cancer cells both replicate rapidly.

D. Genes that regulate cell division are found in some viruses.

Answer Explanation:

Viruses can cause cancer by inserting their genetic material into the host cell's DNA, disrupting the normal regulation of cell division and growth. This process is called viral oncogenesis. Some viruses, such as human papillomavirus (HPV) and hepatitis B virus (HBV), are known to cause certain types of cancer in humans. Genes that regulate cell division are found in some viruses. This statement implies that some viruses have the ability to alter the host cell's genes and induce cancerous changes.

Therefore, the Correct Answer is D.

Q #1: In a certain plant, red flowers are dominant over white flowers. A plant heterozygous for red flowers and a plant with white flowers are crossed. Which of the following is the expected proportion of phenotypes in the next generation?

A. 1 red, 3 white

B. 4 red, 0 white

C. 2 red, 2 white

D. 3 red, 1 white

Answer Explanation

The law of segregation states that each individual has two alleles for each trait, and these alleles separate during gamete formation. The allele that each gamete receives is random. Therefore, the probability of getting a certain genotype or phenotype depends on the Punnett square. In this case, the plant heterozygous for red flowers has the genotype Rr, where R is the dominant allele for red flowers and r is the recessive allele for white flowers. The plant with white flowers has the genotype rr. half of the offspring will have the genotype Rr and half will have the genotype rr. Since R is dominant over r, the offspring with Rr will have red flowers and the offspring with rr will have white flowers. Therefore, the expected proportion of phenotypes in the next generation is 2 red, 2 white.
Q #2: Which of the following statements best supports the hypothesis that viruses can cause cancer?

A. Cellular DNA has sequences related to viral sequences.

B. Cancerous and normal cells share genetic sequences.

C. Viruses and cancer cells both replicate rapidly.

D. Genes that regulate cell division are found in some viruses.

Answer Explanation

Viruses can cause cancer by inserting their genetic material into the host cell's DNA, disrupting the normal regulation of cell division and growth. This process is called viral oncogenesis. Some viruses, such as human papillomavirus (HPV) and hepatitis B virus (HBV), are known to cause certain types of cancer in humans. Genes that regulate cell division are found in some viruses. This statement implies that some viruses have the ability to alter the host cell's genes and induce cancerous changes.
Q #3: Which of the following chemicals is released by one type of immune cell to directly activate another type of immune cell?

A. Lysozymes

B. Perforin

C. Cytokines

D. Granzymes

Answer Explanation

Cytokines are small proteins that act as chemical messengers between different types of immune cells. They can stimulate or inhibit the activation, proliferation, differentiation, and migration of immune cells. For example, interleukins are a type of cytokine that is produced by one type of white blood cell and can affect the behavior of another type of white blood cell. Lysozymes, perforin, and granzymes are all molecules that are involved in killing pathogens or infected cells, but they do not directly activate other immune cells.

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Which of the following statements best supports the hypothesis that viruses can cause cancer?

More Questions on TEAS 7 Science

Q #1: In a certain plant, red flowers are dominant over white flowers. A plant heterozygous for red flowers and a plant with white flowers are crossed. Which of the following is the expected proportion of phenotypes in the next generation?

Answer Explanation

Q #2: Which of the following statements best supports the hypothesis that viruses can cause cancer?

Answer Explanation

Q #3: Which of the following chemicals is released by one type of immune cell to directly activate another type of immune cell?

Answer Explanation

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