What structures are used by bacteriophages to attach to host cell receptors?

A. Tail fibers
B. Capsid heads
C. Nucleic acids
D. Viral sheaths


Answer: A

Biology & Microbiology

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If vaccinia viruses were not both immunogenic and relatively benign, they would likely not be a favored vehicle for vaccinations

Indicate whether the statement is true or false.

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Meiosis is different from mitosis in that meiosis

A. results in four haploid daughter cells that are genetically identical, whereas mitosis results in two diploid daughter cells that are genetically diverse. B. results in two diploid daughter cells that are genetically diverse, whereas mitosis results in four haploid daughter cells that are genetically identical. C. results in two diploid daughter cells that are genetically identical, whereas mitosis results in four haploid daughter cells that are genetically diverse. D. results in four haploid daughter cells that are genetically diverse, whereas mitosis results in two diploid daughter cells that are genetically identical.

Biology & Microbiology

Human growth hormone (HGH) can be used to treat patients with pituitary dwarfism. Today, parents are getting HGH injections for their children to provide an advantage in sports or to enhance their appearance by making them taller. Based on what you know

about the process of bone lengthening, what is the most appropriate age group to begin such injections? A) 7- to 10-year-olds B) 18- to 21-year-olds C) 21- to 30-year-olds D) 3- to 6-year-olds

Biology & Microbiology

Which of the following is a feature shared by Staphylococcus aureus and Staphylococcus epidermidis?

A. slime layer (capsule) B. protein A C. coagulase D. staphylokinase E. hyaluronidase

Biology & Microbiology