Random genetic drift is due to chance events that alter the allele frequency in a population
Indicate whether the statement is true or false
TRUE
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Once in the respiratory tract, the flu virus targets cells based on specific glycoproteins on their surfaces. How does the virus gain entry into the target cell?
A. Viruses are made up of lipids and can therefore diffuse through the membrane of target cells, gaining entry. B. Glycoproteins within the virus structure bind with glycoproteins on the membrane of the target cell and the virus squeezes through the glycoprotein into the cell. C. The H spikes of the influenza virus break down the cell wall, allowing the virus to gain entry. D. The N spikes of the influenza virus help break down the plasma membrane of a cell, allowing entry of the virus into the cell.
When an enzyme shows Michaelis-Menton kinetics, Km is equal to [S] when the reaction rate is:
A. 0.5 Vmax. B. 0.5 V0. C. 0.1 Vmax. D. 0.1 V0. E. Vmax [S].
After PCR, the amplification control has failed to yield a product. What should you do?
a. Report out Indeterminate b. Report out Negative because there was no amplification from the sample c. Check the original DNA or RNA prepara-tion. If it is adequate, repeat the amplifi-cation. If not, re-isolate the nucleic acid. d. Repeat it using a higher concentration of amplification control in the reaction.
The yellow zone in the tropical middle intertidal owes its color to:
a. sponges. b. boring algae. c. barnacles. d. limpets. e. crabs.