One hypothesis for why we age, or at least why our cells age, is that every time that mitosis occurs, ________ at the ends of chromosomes shorten, and eventually the cell runs out of these units at the ends of chromosomes
Fill in the blank(s) with correct word
telomeres
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Enzymes involved in metabolism are most likely regulated via _____
A. feedback inhibition B. acetylation C. methylation D. none of the answers are correct
Atmospheric chemists think that Earth's first atmosphere
a. contained large amounts of molecular oxygen. b. consisted of carbon in the form of carbon monoxide. c. contained nitrogen in the form of ammonia and nitrogen gas. d. contained no oxygen atoms. e. was very similar to today's atmosphere.
The typical leave is a broad and flat the structure maximizes the amount of light the Leaf can capture first photosynthesis,area available for the plans to observe carbon dioxide, area available for the plane to observe water both A and B Both
What will be an ideal response?
In the light microscope, DNA molecules are most visible in which of the following?
a. in the form of euchromatin b. in a cell that is dividing c. when they are in their most extended form d. during interphase e. when they are stripped of histones