Which of the following types of animal virus requires RNA-dependent RNA transcriptase to be replicated?
A. +ssRNA viruses
B. ssDNA viruses
C. -ssRNA viruses
D. retroviruses
E. dsDNA viruses
Answer: C
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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
Membrane-bound organelles have been an important component in the evolution of complex, multicellular organisms. Which of the following best summarizes an advantage of eukaryotic cells having internal membranes?
(A) Eukaryotic cells are able to reproduce faster because of the presence of organelles. (B) Some organelles, such as mitochondria and chloroplasts, are similar to prokaryotic cells in structure. (C) Organelles isolate specific reactions, increasing metabolic efficiency. (D) Compartmentalization leads to a higher mutation rate in DNA, which leads to more new species.
Members of the genus Staphylococcus are normally associated with ________.
A. mucous membranes B. skin glands C. skin D. All of the choices are correct.
Which is one of the seven characteristics that Mendel observed in pea plants? Which is one of the seven characteristics that Mendel observed in pea plants?
A. flower size B. seed texture C. leaf shape D. stem color