The presence of DNA is not one of the major characteristics of life. Why, then, might scientists look for the presence of DNA to help confirm the existence of life?
What will be an ideal response?
In all of the life-forms on Earth, genes that are made up of DNA control heredity (which is one of the major characteristics of life). Although heredity in life-forms from another planet might be controlled differently, this is the only mechanism with which we are currently familiar.
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The common passageway for air and food is the ____
a. nasal cavity b. epiglottis c. glottis d. pharynx e. larynx
The pathogen that causes Legionnaires'pneumonia also causes a milder infection called Pontiac fever.
a. true b. false
Which infectious disease is transmitted vertically?
A. Human rhinoviruses, a cold, from someone sneezing in your face B. Gonorrhea, a disease transmitted between sexual partners C. Zika, spread by mosquitoes D. Mesothelioma, lung cancer caused by asbestos E. HIV, spread from mother to child during gestation or breast feeding
Which organelle can be likened to a post office?
A. Golgi apparatus B. nucleus C. mitochondria D. endoplasmic reticulum E. nucleolus