False , as with deer , a buck has antlers , and a doe has no antlers
Answer:Un estudio de la Universidad de Barelona demuestra, por primera vez, cómo pueden separarse los genes a lo largo de los linajes evolutivos mediante el mecanismo de la retrotransposición, que es la síntesis de ADN a partir de ARN a través de la transcriptasa inversa.
Explanation:
Answer:
The correct selection of answers to the question: Identify the pieces of evidence describing the features of DNA that Watson and Crick used to determine the structure of DNA, would be:
C: The two chains are parallel, both running in a 5´ to 3´ direction
D: A purine base forms hydrogen bonds to pair with a pyrimidine base located on the opposite DNA strand. Specifically, A pairs with T, and C pairs with G.
E: The sugar-phosphate backbones of each DNA helix run antiparallel to one another
F: The diameter of the DNA doube helix is 2 nm, with each purine-pyrimidine base pair spanning an equivalent distance between the two chains.
Explanation:
Although Watson´s and Crick´s research, and model of the DNA helix, became the breakthrough for science, as it visually presented the now known characteristics of DNA, this research was possible due to the way that these two researchers used previous information found by other scientist on the molecule, to finally build their model. All of the options that were selected were part of the research of several scientis, including Mendel, Rosalin Franklin, Linus Pauling, Maurice Wilkins, Oswald Avery and many others, who worked on different aspects of specimens and their specific characteristics, and which led them to discover that organisms possessed DNA, that this was the unit of information that directed all functions in living cells and how this DNA helix was chemically built to understand how it worked, and why it worked the way it did.
It’s possible because both parents possessed the trait for green eyes.
Answer:
a. Naked dna
f. nucleosome
e. solenoid
g. loop domain
d. chromatid
c. chromosomes
b. metaphase
Explanation:
The naked DNA consists of the DNA molecule not associated with proteins.
A nucleosome is an octamer of histone proteins (i.e., dimers of H2A, H2B, H3, H4) associated with DNA.
A solenoid is a chromatin fiber consisting of 30 nanometers (nm), it represents the secondary structure of the chromatin.
The chromatin fibers are organized into loops (300 nm) that represent the tertiary structure of the chromatin. These loops enable to package chromosome segments consisting of about 100 kilobases (kb).
The sister chromatids are two identical DNA-based structures that remain joined together by the centromere to form a single chromosome (700 nm).
