Ecosystems are characterized by the cycling of ____________ and by the flow of ____________ .
Fill in the blank(s) with the appropriate word(s)
Ans: chemicals. energy
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Between the specialized functions of the rough and smooth endoplasmic reticulum, neither have the ability to
A. produce lipids. B. produce mRNA. C. produce proteins. D. detoxify poisons. E. form vesicles for transport to the Golgi apparatus.
Small single strand DNA molecules with a fluorescent molecule attached that are used to identify a clone containing a specific gene fragment is called a
A) primer. B) probe. C) plasmid. D) promoter. E) peptide.
Mutations that eliminate a contiguous region in the Drosophila embryo's segmentation pattern are called ________
A) segment genes B) linkage genes C) compartment genes D) homeodomains E) gap genes
Please select the answers below that correspond to structural features of HIV and their host cells necessary for HIV infection to occur.
> The HIV envelope contains glycoproteins that mediate viral absorption and fusion to the host cell. > The helical HIV capsid opens to allow access of its single-stranded DNA genome to the host cell genome. > Infectable host cell membranes must present surface receptors including a CD4 marker, as well as a co-receptor. > Infectable host cells must actively phagocytize the HIV particle through the host cell membrane.