Most invertebrates have:a
isolecithal eggs and meroblastic cleavage.
b. telolecithal eggs and meroblastic cleavage.
c. isolecithal eggs and holoblastic cleavage.
d. telolecithal eggs and holoblastic cleavage.
e. isolecithal eggs and radial cleavage.
D
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Which pair diverged longer ago from their common ancestor and why?
When comparing the sequences of a homologous gene in four different species, one pair of species shows a 1% difference, whereas the other pair shows a 3% difference. A. The pair with a 1% difference; because a lower difference (1% instead of 3%) has occurred because the common ancestor is younger and more mutations occurred over a shorter amount of time. B. The pair with a 1% difference would have an older common ancestor; A higher difference (1% instead of 3%) has occurred because the common ancestor is older and there has been more time to accumulate mutations. C. The pair with a 3% difference would have an older common ancestor; A lower difference (3% instead of 1%) has occurred because the common ancestor is younger and there has been more time to accumulate mutations. D. The pair with a 3% difference would have an older common ancestor; A higher difference (3% instead of 1%) has occurred because the common ancestor is older and there has been more time to accumulate mutations. E. None of these are correct.
The PCR technique requires a DNA polymerase from an organism that can endure high heat, such as Thermus aquaticus. What step of the protocol makes the heat-stability most necessary?
A. Synthesis B. Denaturation C. Primer annealing D. Antibody binding
Prior to the early 1900's, why did surgeons refuse to wash their hands?
A) There were few infections so it did not seem necessary. B) They wore thick gloves so the risk to patients was small. C) It was simply too time consuming.
Persea americana is the binomial for Avocado that is included in Lauraceae. Pick the species name only for this plant.
Persea americana Avocado Lauraceae