NeNe323

10.03.2020 • 

Biology

1. There are three main types of cellular work: chemical, transport, and movement. Most of this work is powered by the transfer of a phosphate group from one molecule to another in a process known as . 2. Through energy coupling, cells use exergonic, or energy-releasing, reactions to drive endergonic, or energy-requiring, reactions. The molecule ATP is the energy shuttle between these two types of reactions. 3. A specific enzyme speeds up each of a cell's chemical reactions. 4. Mechanisms such as enable precise control over a cell's -- all of its chemical reactions.

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coolquezzie

15.02.2022

Biology

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Females have two X chromosomes in their cells, while males have both X and a Y chromosomes in their cells. Egg cells all contain an X chromosome, while sperm cells contain an X or Y chromosome. This arrangement means that it is the male that determines the sex of the offspring when fertilization occurs.

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