Answer:
Constructing phylogenetic trees using molecular data
A transformative tool for phylogenetic analysis is DNA sequencing. This method allows us to compare the sequences of orthologous (evolutionarily related) genes or proteins instead of relying solely on the physical or behavioral traits of organisms.
The fundamental concept behind such comparisons is akin to our previous discussion: there is a common ancestor for the DNA or protein sequence, and it may have undergone changes throughout evolutionary history. However, a gene or protein isn't limited to a singular characteristic that exists in two forms.
Instead, every nucleotide in a gene or each amino acid in a protein can be considered an individual feature that can mutate into multiple forms (e.g., A, T, C, or G for nucleotides). Thus, a gene consisting of 300 nucleotides could be interpreted as having 300 distinct features present in 4 states. The data gleaned from sequence analyses—and consequently, the detail we can achieve in a phylogenetic tree—is significantly greater than when we analyze physical characteristics.
To interpret sequence data and uncover the most likely phylogenetic tree, biologists often employ computer software and statistical algorithms. Generally, when sequences of a gene or protein are compared among species:
A larger count of variations indicates less related species
A smaller count of variations indicates more closely related species
Response: Option D.
Justification:
Active transport refers to how molecules or solutes travel through a membrane based on solute concentration differences.
This process is constant due to diffusion, which ensures ongoing movement of solutes across the membrane. Cells have reduced sodium (Na+) levels but increased potassium (K+) levels. Therefore, sodium's electrical and concentration gradients promote the ion's entry into the cell, assisted by the positive charge of Na+, which encourages inward movement to the negatively charged interior.
Thus, the right choice is D.
Answer:
As defined by the genetic code, the amino acids include:
- Glycine: encoded by GGC, GGA, and GGG codons
- Arginine: encoded by AGA and AGG codons
- Lysine: encoded by AAA and AAG codons
- Glutamic acid: represented by GAA and GAG codons
Explanation:
The likelihood of observing an amino acid comprised of Glutamic acid in the coding sequence stands at 2/9 for each codon
C. Era del Precámbrico Tardío. El término eón se refiere a dos o más eras geológicas que componen un eón. Se divide principalmente en cuatro eones: Hadeano, Arcaico, Proterozoico y Fanerozoico. Este último incluye las eras Paleozoica, Mesozoica y Cenozoica. El Cámbrico forma parte de la era Paleozoica, la cual fue un período crucial en la escala de tiempo geológico por el repentino desarrollo de una gran diversidad de filos animales. Durante este tiempo, también apareció la primera planta terrestre, lo que fue un avance prometedor para el crecimiento de vegetación en condiciones estacionales adecuadas.
Answer:
Both B and C are correct
Explanation:
Gelatin, commonly known as hydrolyzed collagen, is a structural protein in animals that gets hydrolyzed to form gelatin.Gelatin is a translucent, colorless, and flavorless ingredient used as a gelling agent in food, pharmaceuticals, and cosmetics.
When dry, it appears bristly and becomes gummy when wet.
Gummy bears are known for their chewy texture, which is attributed to gelatin.
