Why do most viruses only infect one type of cell?
a. Viruses can only live in particular environments found within a select group of cells.
b. Viruses can only find the necessary components to keep itself alive in one type of cell.
c. Viruses can only infect cells that have the appropriate receptors for them to attach to.
d. Viruses cannot move throughout the body so only infect the cells they first come into
contact with.
c. Viruses can only infect cells that have the appropriate receptors for them to attach to.
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You are given 100 acres of land and asked to use the land for long-term reduction of atmospheric CO2 levels. Which of the following is the best use of the land for this purpose?
A. Plant a rapidly growing grass that can be harvested every year and used to make ethanol that is added to gasoline. B. Plant slow-growing, bristle-cone pine trees that are known to live for thousands of years and reach a height of about 6 feet. C. Plant corn that is used to feed pigs that are then harvested for sausage meat that is sold at the grocery store. D. Plant a regular lawn and use the land as a park to encourage the local population to exercise more. E. Plant trees that grow rapidly, reach a huge size, and live for a long time.
ws+; ws+; ws; ws; ws+; ws+; ws; ws
In Neurospora, the white-spore allele (ws) results in white spores rather than the wild-type black spores. Diploid ws / ws+ cells undergo meiosis followed by one round of mitosis to form ordered tetrads. Indicate if the pattern of spores seen in the tetrads are consistent with first-division or second-division segregation. A) first-division segregation pattern B) second-division segregation pattern
Members of the phylum ____ are called acorn worms. They use their mucus-coated proboscis to
construct U-shaped burrows to trap food particles, and also trap food from water passed through gill slits in their pharynx.
a. Hemichordata b. Echinodermata c. Cnidaria d. Arthropoda e. Chordata
Our knowledge of existing species is limited and
biased toward __________. Fill in the blank(s) with the appropriate word(s).