ATP molecules are catalysts that lower the activation energy needed to initiate a reaction.
Answer the following statement true (T) or false (F)
False
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During normal DNA replication, part of the sequence at the ends of linear chromosomes is not copied into the new
DNA strands because ____.
a. DNA ligase cannot join pieces at the end of a chromosome b. RNA primers at the beginning of a new strand cannot be replaced with DNA c. those ends are Okazaki fragments that are lost d. cells do not need the DNA at the ends of chromosomes e. the ends of chromosomes are made of protein, not DNA
A species that is so important to its community (such as the sea otter) that their removal can dismantle a food web is termed a species.
A. capstone B. flagstone C. cobblestone D. cornerstone E. keystone
A muscle ____________________ is a sudden, isolated involuntary contraction. Fill in the blank(s) with the appropriate word(s)
Myasthenia gravis is a disease caused by the immune system that attacks the acetylcholine receptors found on muscle cells. What effect would blocking these receptors have on muscle contraction?
What will be an ideal response?