Which statement regarding viral species is true?
a. Viral species are not classified as part of any of the three domains.
b. Viral species are taxonomically differentiated based upon their cell wall.
c. Viral species are classified within the Kingdom Plantae in the Domain Eukarya.
d. Viruses are classified as prokaryotes.
Ans: a. Viral species are not classified as part of any of the three domains.
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Prenatal diagnosis techniques such as amniocentesis and chorionic villus sampling remove cells produced by the embryo. These cells are then used ____.
a. to treat diseases b. for implantation to produce pregnancy c. to develop embryonic stem cells d. to test for the presence of mutant alleles or chromosomal alterations e. for cloning
Intellectual disability can result if a baby does not receive enough oxygen during labor or birth. Which cause of intellectual disability best describes this situation?
A) Abnormal genes or chromosomes B) Environmental exposure to toxins C) Malnutrition D) Noninherited birth defects
If a species of insect provides most of the food for a particular species of bird, this is part of the bird's
A. habitat. B. environment. C. niche. D. range.
Lipid A is a component of
A) the outer membrane of Gram-negative bacteria. B) plant cell walls. C) cytoplasmic membranes. D) Gram-positive bacterial membranes. E) bacterial glycocalyces.