Biology, 24.12.2019 19:31 Kuwillalean38
For a science fair project, two students decided to repeat the hershey and chase experiment, with modifications. they decided to label nitrogen of the dna, rather than the phosphate. they reasoned that each nucleotide has only one phosphate and two to five nitrogens. thus, labeling nitrogens would provide a stronger signal than labeling phosphate why won't this work?
a) there is no radioactive isotope of nitrogen
b) radioactive nitrogen has a half-life of 100,000 years, and the material would be too dangerous for too long
c) avery, maccloud and mccarty already did this
d) although their are more nitrogens in a nucletotide, labeled phosphates actually have 16 extra neutrons; t shift ctrl herefore, they are more radioactive
e) amino acids (and thus and proteins proteins) also have nitrogen atoms;
Answers: 3
Biology, 22.06.2019 00:00
The table below shows the number of foot bones in some horse fossils.horse fossil recordhorse fossil number of foot bonesp 19q 17r 24s 13ancient horses had more bones in their foot then present-day horses. the present-day horse has 11 foot bones. what is the correct order of evolution of the horse starting from the youngest fossil? a. q p r s b. s r p q c. s q p r d. r p q s
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Biology, 22.06.2019 04:00
The tubes transporting minerals and water upward are called ?
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Biology, 22.06.2019 08:00
Cattle with brown fur and cattle with white fur will produce a reddish roan calf . when examined closely, the calf show about an even number of brown hairs and white hairs that give a reddish appearance when viewed from far away. the fact that both the brown fur allele and the white fur allele are expressed equally in the offspring is an example of
Answers: 3
For a science fair project, two students decided to repeat the hershey and chase experiment, with mo...
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