Why is it ineffective to treat viral disease with antibiotics?
a) Due to excessive antibiotic use, most viruses have evolved to be resistant to antibiotics.
b) Antibiotics inhibit enzymes specific to bacteria and have no effect on virally encoded enzymes.
c) Pathogenic RNA viruses have a high rate of mutation, producing new genetic varieties that are insensitive to antibiotic treatment.
Answer: b) Antibiotics inhibit enzymes specific to bacteria and have no effect on virally encoded enzymes.
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Spina bifida is one of the most prevalent of human birth defects. The defect usually involves the spinal cord or the spinal canal opening to the outside of the body. Spina bifida results from problems during the formation of the _____
A) neural tube B) gastrula C) notochord D) somites E) blastula
If the nucleotide sequence in a DNA template strand is GGCTTAACCATT; the complementary mRNA strand will have the sequence ____________________
Fill in the blank(s) with correct word
A researcher collected a single-celled organism from birdbath water and grew the organism in a laboratory. The researcher observed the organism reproducing by cell division, which resulted in identical offspring generations. This organism exhibits a form of
A. sexual reproduction, mixing genetic material from the parent cells. B. asexual reproduction. C. a form of reproduction occurring only in bacteria. D. sexual reproduction of fungi. E. evolution of each new generation produced.
Four of the five answers listed below are types of
intercellular connections. Select the exception. a. tight junctions b. gap junctions c. plasmodesmata d. adhering junctions e. plasmalemma