Explain how Clostridium tetani cells that rarely leave their initial site of infection can cause death in their hosts
What will be an ideal response?
Answer: C. tetani produces tetanus toxins that move to distant parts of the body, initiating irreversible muscle contraction, and often death of the host. Although the cells do not actively travel around the host, the toxins it produces cause the death of the host.
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All target cells of a specific hormone must have ____
a. hydrophilic plasma membranes b. proximity to an endocrine gland c. an appropriate receptor molecule d. special lipids in their plasma membranes e. access to absorbed carbohydrates
Darker skin color is correlated with ____
a. the northern hemisphere b. inland regions c. coastal regions d. longitude e. the intensity of UV radiation
During prophase I, each chiasma represents:
a. the remnants of the nuclear envelope. b. the remnant of the nucleolus. c. a newly formed haploid gamete. d. a site of crossing-over. e. the site where sister chromatids are connected.
Different species can sometimes interbreed to produce hybrid offspring. For example, the breeding of a horse with a donkey produces a mule. However, these hybrids are usually sterile. A horse will produce gametes with 32 chromosomes, and a donkey will
produce gametes with 31 chromosomes, resulting in a mule with 63 chromosomes. Using your understanding of meiosis, propose a reason why mules are sterile. What will be an ideal response?