Which of the following is NOT a way to genetically engineer vaccines?
a. removing genes from the pathogen that encode virulence factors
b. adding genes to a harmless virus that elicit an immune response to a pathogen
c. adding the thymidine kinase gene from the vaccinia virus
d. producing large amounts of immunogenic proteins by cloning
Answer: C
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Suppose you are studying the nitrogen cycling in a pond ecosystem over the course of a month. While you are collecting data, a flock of one hundred Canada geese lands and spends the night during a fall migration
What could you do to eliminate error in your study as a result of this event? A) Find out how much nitrogen is consumed in plant material by a Canada goose over about a twelve-hour period, multiply this number by 100, and add that amount to the total nitrogen in the ecosystem. B) Find out how much nitrogen is eliminated by a Canada goose over about a twelve-hour period, multiply this number by 100, and subtract that amount from the total nitrogen in the ecosystem. C) Find out how much nitrogen is consumed and eliminated by a Canada goose over about a twelve-hour period and multiply this number by 100; enter this +/- value into the nitrogen budget of the ecosystem. D) Do nothing. The Canada geese visitation to the lake would have negligible impact on the nitrogen budget of the pond. E) Put a net over the pond so that no more migrating flocks can land on the pond and alter the nitrogen balance of the pond.
Suppose you have two traits controlled by genes on separate chromosomes. If sexual reproduction occurs between two heterozygous parents, what is the genotypic ratio of all possible gametes?
What will be an ideal response?
Fungi are more closely related to plants than they are to animals
A. true B. false
At equilibrium the allele and genotype frequencies of a population change over time
Indicate whether the statement is true or false