RNA viruses require their own supply of certain enzymes because _____
A) host cells rapidly destroy the viruses
B) host cells lack enzymes that can replicate the viral genome
C) these enzymes translate viral mRNA into proteins
D) these enzymes penetrate host cell membranes
E) these enzymes cannot be made in host cells
Answer: B
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A researcher is looking to create a new form of soybean plant that has a high crop yield and is easy to grow. What are traits that he should select for in this plant (i.e., what traits are particularly attractive for an agricultural crop)?
Select all correct choices. A. long stems or stalks B. short stems or stalks C. long-day plants D. short-day plants E. day-neutral plants
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A. gap junction. B. plasmodesmata. C. neuron junction. D. paracrine space. E. chemical synapse.
The cells infected by the human immunodeficiency virus include:
A. Keratinized skin cells B. Respiratory epithelial cells C. B-cells D. Basal skin cells E. CD4+ T-cells, monocytes and macrophages