The phenomenon known as chemotaxis is defined as
A) the squeezing of cells through the lining of capillaries.
B) the release of prostaglandins and leukotrienes in response to microbes.
C) the movement of a cell toward or away from a chemical stimulus.
D) the coating of a pathogen by complement.
E) an increase in allergies and helminth infection.
C
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The various techniques by which scientists manipulate DNA in the lab are termed ________.
A. genetic engineering B. biotechnology C. recombinant DNA D. gel electrophoresis E. gene probes
What type of chemical bond connects the complementary strands of a DNA molecule to each other?
A) hydrogen bonds B) ionic bonds C) nonpolar covalent bonds D) polar covalent bonds
During the ____ period, life first appeared on land, but it was not until the ____ period that animals first appeared on land.
What will be an ideal response?
Viruses with single-stranded DNA are the:
A. Herpesviruses. B. Adenoviruses. C. Poxviruses. D. Papovaviruses. E. Parvoviruses.