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Biology, 22.06.2019 23:00
Nitrogen-14 and nitrogen-15 are isotopes of the same element. how do these two isotopes differ? a. they have different numbers of nuclei. b. they have different numbers of protons. c. they have different numbers of neutrons. d. they have different numbers of electrons.
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Biology, 22.06.2019 23:30
The upper forelimbs of humans and bats have fairly similar skeletal structures, whereas the correspondingbones in whales have very different shapes and proportions. however, genetic data suggest that all three kindsof organisms diverged from a common ancestor at about the same time. which of the following is the mostlikely explanation for these data? a) humans and bats evolved by natural selection, and whales evolved by lamarckian mechanisms.b) forelimb evolution was adaptive in people and bats, but not in whales.c) natural selection in an aquatic environment resulted in significant changes to whale forelimb anatomy.d) genes mutate faster in whales than in humans or bats.e) whales are not properly classified as mammals.
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Biology, 23.06.2019 01:30
Which series lists the correct order of steps of binary fission from first to last? sex pilus connects two cells ® plasmid dna is transferred ® complementary dna strands are created ® cells separate live cells bind to degraded cells ® dna is transported across the membrane ® dna is incorporated into recipient's dna virus infects bacterial cell, new viruses are made ® dna is assembled in new virus ® new virus infects another bacterial cell and transfers dna dna is copied ® dna molecules attach to cell membrane ® cell membrane elongates and pinches off ® two identical cells are produced
Answers: 1
What was the ratio of dominant to recessive phenotypes in the f2 generation of mendel's experiments?...
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