Scientists use shared biological components to determine relationships among the three domains of life. What is an example of an organelle used for this purpose?
What will be an ideal response?
ribosomes
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Why do vaccines help human health?
A. Vaccines stimulate the immune system to remember a virus for an extended period of time. B. Vaccines stimulate the immune system to recognize a virus faster if encountered. C. Vaccines stimulate the immune system to destroy a virus more effectively if encountered. D. All of the above are reasons why vaccines help human health.
Fertilization is indicated by
a. A. b. B. c. C. d. D. e. E.
HIV has an RNA genome that is converted to DNA when infecting a human immune cell. This type of virus is called a ________
A) bacteriophage B) prion C) retrovirus D) reverse transcriptase
Primary immunodeficiency diseases
A) develop later in life. B) are detectable close to birth. C) may be caused by malnutrition. D) are never associated with genetic defects. E) are sometimes caused by severe stress.