A tuna is a ____ fish

a. ray-finned
b. lobe-finned
c. cartilaginous
d. jawless
e. invertebrate


ANSWER: a

Biology & Microbiology

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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.

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Transpiration harnesses the force of gravity to accelerate water transportation from the soil to the leaves.

True or False?

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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.

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This newly identified organism has been discovered to live on our skin

a. reduce pH b. increase pH c. no effect

Biology & Microbiology