Answer:
B. Stem cell research led to a huge leap in medical science.
Explanation:
Secondary succession occurred because the organisms on the forest floor changed.
Climax vegetation occurred because the seedlings finally had a chance to grow.
Primary succession occurred because more plant life in the ecosystem was healthier.
Answer:
Option- D
Explanation:
Answer:
D. A molecule with negative charges interacts with positively charged side chains in the enzyme’s active site.
Explanation:
Because opposite charges attract, a molecule with negative charges will form favorable interactions with positively charged side chains in an enzyme’s active site. Based on the model, the favorable interactions helps explain the enzyme’s specificity for the molecule as a substrate.
I also got this question correct so I am sure.
lose
gain
Answer;
Complete
Valence is the number of electrons an atom must gain or lose in order to complete its outer energy level or have a stable octet in its outer shell.
Explanation;
-Valency is the number of electrons that an atom requires to gain or lose to form a complete configuration or an octet configuration.
-Atoms tend to lose or get electrons in order to achieve the electronic arrangement of atoms of the noble gases. An ion is an atom or group of atoms having an overall electrical charge. Atoms gain electrons to form cations (positively charged atom), while other lose to form anions (negatively charged atoms).
b. Crossing-over
c. Nondisjunction
d. Trisomy
b. Carbohydrates will dissolve in water but not lipids.
c. Carbohydrates contain hydrogen, carbon, and oxygen and lipids do not.
d. Lipids contain hydrogen, carbon, and oxygen and carbohydrates do not.
Answer:
B. Carbohydrates will dissolve in water but not lipids
Explanation:
Both carbohydrates and lipids have oxygen, carbon and hydrogen molecules in their compositions.
However, the difference is that carbohydrates are polar and lipids are nonpolar. Nonpolar substances can only be dissolved in nonpolar solvents and so they are insoluble in water (which is polar). Compounds with this feature are called hydrophobic.