Answer the following question given this paragraph: (a) When pyrimidine or purine and a sugar react to form a glycosidic bond, a nucleoside is produced. Adding a phosphoric acid group to the sugar of a nucleoside produces a nucleotide. (b) Nucleotides link together to form long polymeric chains. A DNA molecule consists of two such chains held together by hydrogen bonding between the purine and pyrimidine components on different chains. Mutations in the DNA of an organism may lead to the synthesis of defective proteins. Phenylketonuria (PKU), for example, is a condition caused by a defective enzyme. Left. Q: What links together to form long polymeric chains? Choices: - genes - lipids - peptides - nucleotides A:
nucleotides
Answer the following question given this paragraph: Q: Species distributions are a consequence of both ecological and evolutionary what? Choices: - fluctuations - particles - isolation - interactions A:
interactions
Q: Answer the following question given this paragraph: Adulthood does not have a definite starting point. A person may be physically mature by age 16 or 17 but not defined as an adult by law until older ages. In the U. S. , you can't join the armed forces or vote until age 18. You can't buy or use alcohol or take on many legal and financial responsibilities until age 21. Q: What phase of a human life does not have a definite starting point? Choices: - adolescence - death - childhood - adulthood A:
A: adulthood
Question: Answer the following question given this paragraph: Q: What impact does photosynthesis have on the direction of electron flow? Choices: - repeats it - cycles it - cools it - reverses it A:
Answer: reverses it
*Question*
Answer the following question given this paragraph: Cell division is part of the life cycle of virtually all cells. Cell division is the process in which one cell divides to form two new cells. Q: What is the process in which one cell divides to form two new cells called? Choices: - cell direction - cell contribution - Cell Formation - cell division A:
**Answer**
cell division
(Q).
Answer the following question given this paragraph: Temperature increases. Chemical reactions are faster at higher temperatures. Q: What happened to chemical reactions when temperature increases? Choices: - it slows down for a short time then speeds up - it stays the same - it becomes slower - it became faster A:
(A).
it became faster