Explain why hydrogen atom can become either an ion or a part of molecule

Which of the following is an example of an epigenetic change in eukaryotes? A) a loss of an AT base pair from a gene B) the addition of methyl groups to cytosines in the promoter region of a gene C) the substitution of an AT base pair by a GC base

Explain why cell division throughout the body cases at the end of puberty

Which of the following statements about cell-cycle regulation is correct? A. Cyclins are regulatory nucleotides in the cell cycle. B. Cyclin-Cdk complexes phosphorylate carbohydrates. C.

Imagine snow on top of a mountain. Describe at least two ways energy could be transferred as the seasons change.

An intrathecal injection is directed into A. the capsule of a joint. B. the space underlying spinal cord membranes. C. a body cavity. D. the heart.

The narrowest taxon in the Linnaean system is the genus, order, or species

What food source is available to animals in benthic zone and marine habitats

The process of breaking down a larger molecule, called a ploymer, into its monomets is called what

Carol is enjoying eating her dinner. While eating, she notices that her saliva secretion is higher than normal and that she feels good and relaxed. What causes this relaxed state?

What is the difference between bacillus, coccus, and spirillum