Two true-breeding mutant strains of Drosophila have black body color instead of the wild-type gray yellow. When the two strains are crossed, all the F1 flies have wild-type body color. How can these data be interpreted?
A) Recombination occurred.
B) Complementation occurred.
C) The mutations involved are on two different genes.
D) A new mutation occurred in all the offspring.
E) Both B and C
E
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The ascending portion of the loop of Henle is
A. permeable to water and impermeable to sodium. B. permeable to water and permeable to sodium. C. impermeable to water and permeable to sodium. D. impermeable to water and impermeable to sodium. E. the site of active transport of water.
Researchers have found that an octopus given a clear plastic box with three different types of lids and a crab inside will eventually figure out how to get at least one of the lids open to get the crab. They have also shown that after a new octopus observes a veteran octopus (who already knows how to open the box), the new octopus is able to open the box and always uses the same type of lid that the veteran used. What term best describes these behaviors?
A. cognitive learning B. innate C. imprinting D. habituation E. associative learning
Some organisms use vitamins as (oxidizers/antioxidants/peroxidases) to be able to live as aerobes
What will be an ideal response?
Why are bacteria not dependent on telomerase for complete DNA replication?
What will be an ideal response?