An immunoassay was developed to rapidly diagnose patients infected with an emerging virus. However, the researchers discovered that some individuals were producing false negatives when tested, despite being infected with the virus. What might explain this?
A. number of genome copies carried in each virion
B. rapid evolution of the viral antigen
C. changes in the length of the viral DNA
D. changes in the antibody produced by the virus
Answer: B
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Plant species are capable of attracting insects using chemicals. How can this aid in defense?
A. Some plant species attract pollinators. B. Some plant species attract insects that consume or parasitize herbivores. C. Some plants have inducible defenses that they produce only when herbivores are feeding on them. D. Some plants produce spines for defense. E. Some plant species are unable to defend themselves.
Place the five steps of digestion in most animals with a digestive tube in the proper order
a. absorption ?enzymatic hydrolysis ?mechanical processing ?secretion of enzymes ?elimination b. absorption ?mechanical processing ?enzymatic hydrolysis ?secretion of enzymes ?elimination c. mechanical processing ?absorption ?secretion of enzymes ?enzymatic hydrolysis ?elimination d. mechanical processing ?secretion of enzymes ?enzymatic hydrolysis ?absorption ?elimination
e. mechanical processing ?secretion of enzymes ?absorption ?enzymatic hydrolysis ?eliminationThe protein kinase activity of the receptor protein-tyrosine kinase is located ____
a. on the extracellular surface of the membrane b. on the cytoplasmic side of the cell membrane c. within the hydrophobic portion of the lipid bilayer d. in the nuclear membrane e. in the cystol
Startle coloration is used to attract mates
Indicate whether the statement is true or false