Answer:
Antidiuretic hormone binds to receptors on cells in the collecting ducts of the kidney promotes reabsorption of water back into circulation, These channels transport solute-free water through tubular cells and back into blood, leading to a decrease in plasma osmolarity and an increase osmolarity of urine.
<u>Answer</u>: Ionic bond
<u>Explanation</u>:
- An ionic bond is a type of a chemical bond formed by the complete transfer of electrons from one atom to another atom i.e one of the atoms loses its electrons and the other gains it. This results in the formation of 2 oppositely charged ions.
- In sodium chloride, sodium loses one electron from its outermost shell (valence shell) whereas chloride gains it. Due to this sodium gains, a net positive charge and chloride gain a net negative charge.
- So, due to the complete transfer of electrons that takes place from sodium to chloride, the compound generated (Sodium chloride) has an ionic bond.
Answer:
Unlike relative dating methods, absolute dating methods provide chronological estimates of the age of certain geological materials associated with fossils, and even direct age measurements of the fossil material itself.
Answer: c - The proportion of the population that is heterozygous (Aa) for this trait is 0.50
Explanation: Percentage of those with homozygous recessive alleles (aa) in the population has been given as 25%. We can represent this as q².
Recall that Hardy-Weinberg provides the equation p² + 2pq + q² = 1, where
P² = homozygous dominant alleles
q² = homozygous recessive alleles
2pq = heterozygous alleles
q² = 25% = 25/100 = 0.25
q = √0.25 = 0.5
Also recall that for two alleles, p and q, p + q = 1.
Therefore, p = 1 - q = 1 - 0.5 0.5
Since we now have the values of p and q, we can calculate the proportion of heterozygous alleles (Aa) as 2pq = 2 x 0.5 x 0.5 = 0.5