Viruses can ________ only after they have entered a host cell, and only by using the host's cellular machinery.
Fill in the blank(s) with the appropriate word(s).
reproduce
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Mismatch of either the Rh antigen or the AB antigen results in lysis of red blood cells by complement
Indicate whether this statement is true or false.
How does the organization of the bacterial genome differ from the organization of the eukaryotic genome?
A. Most bacterial chromosomes are circular and the eukaryotic chromosomes contained in the nucleus are not. B. Eukaryotic chromosomes have to be tightly packed to fit into the nucleus, and bacterial chromosomes do not require tight packing to fit into the cell. C. Bacterial chromosomes are made up of RNA and eukaryotic chromosomes are made up of DNA. D. The eukaryotic genome is found on chromosomes and there are no chromosomes in bacterial cells. E. The compaction of the eukaryotic genome involves structural maintenance of chromosome (SMC) proteins, and the compaction of the bacterial genome does not.
The common ancestor of sponges and other animals was probably
A) multicellular with tissues but without organ systems. B) multicellular with tissues and many organ systems. C) unicellular. D) multicellular without tissues. E) multicellular with tissues and a few organ systems.
Membrane proteins perform all of the following functions except
A) receptors. B) transporters. C) enzymes. D) blocks. E) anchors.