Describe the causative agents and transmission of tuberculosis.
What will be an ideal response?
Tuberculosis is caused by the bacterium Mycobacterium tuberculosis. Its cells have a thick, waxy coating that allows the bacterium to exist in a dehydrated state for weeks at a time. The organisms are spread by airborne droplets, introduced into the air when a person coughs or sneezes. The bacteria can actually float in the air for hours after being released and still be infectious.
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Research suggests that contamination of water by agricultural chemicals appears to____
a. increase sperm count b. decrease sperm count c. increase sperm motility d. eliminate sperm production completely e. have no effect on sperm
In E. coli, the genetic material is composed of ________
A) polypeptide chains B) RNA and protein C) linear, double-stranded DNA D) circular, double-stranded DNA E) circular, double-stranded RNA
While normally one secondary oocyte ruptures from an ovarian follicle at ovulation, what will be the result if two are released and both are fertilized?
A) identical twins B) single birth because only one secondary oocyte can be fertilized C) single birth because even though both may be fertilized, only one will be able to complete development D) fraternal twins
One atomic mass unit (AMU) approximately equals the mass of one
A. proton. B. electron. C. nucleus. D. proton plus the mass of one neutron.