A tuna is a ____ fish
a. ray-finned
b. lobe-finned
c. cartilaginous
d. jawless
e. invertebrate
ANSWER: a
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An allele of RNA polymerase in Drosophila demonstrates a recessive lethal inheritance pattern. Which of the following is true?
A) Homozygous lethal genes will always demonstrate a gain of function pattern. B) The threshold effect is not seen in recessive lethality. C) Two homozygous recessive parents will have 100% homozygous offspring. D) Homozygous recessive offspring will never be seen. E) Two heterozygotes will have offspring with a 2:1 pattern.
Transpiration harnesses the force of gravity to accelerate water transportation from the soil to the leaves.
True or False?
Fisher's sex ratio model was put to test in a species of blue moon butterflies on the Samoan islands of Upolu and Savaii, where which of the following conditions existed?
a. The male:female sex ratio was the expected 1:1. b. 99% of the butterflies were female and only 1% were male. c. Only the males were infected with the Wolbachia bacterium. d. A and C.
This newly identified organism has been discovered to live on our skin
a. reduce pH b. increase pH c. no effect