A radioactive element is an element which is subject to spontaneous degeneration of its nucleus followed by the emission of alpha, beta and gamma particles. All elements with atomic numbers greater than 83 are radioactive.
The given phrases that describe radioactive elements are-
They have a consistent number of particles
- the particles are alpha, beta and gamma particles.
They have a half-life that determines their rate of decay.
Explanation for other options:
Not all elements occur in nature. Radioactive decay rates may not be constant as the decay happens when a radioactive substance emits a particle. It is not possible to predict exactly when a given atom of a substance will emit a particular particle. When the radioactive element release energy and particles, it decays.
<h3>What is the purpose of multiphasic pills?</h3>
The dosages and progestin-to-estrogen ratios during the 21-day cycle are changed using multiphasic tablets.
<h3>What is oral contraceptive?</h3>
a pill that is used to avoid pregnancy. It contains hormones that prevent the ovaries from releasing eggs.
<h3>What are the types in oral contraceptives?</h3>
- The combination pill
- The progestin-only pill
- The continuous use pill.
Learn more about oral contraceptive here:
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Answer:
B
Explanation:
The fatty acid tails of phospholipids are hydrophobic – meaning they are ‘water-hating’. This is why they are in the middle of the bi-lipid layer of the cell membrane 'hiding' from the 'watery' environment of a cell. This poses a challenge in the diffusion of large and charged molecules across the membrane -such as sodium ions. Such molecules need transmembrane protein channels to help them cross the membrane. These are called integral proteins because they are part and parcel of the cell membrane. The cell membrane, in addition, also has glycolipids and glycoproteins on its surface that are significant in the identification of the cell by other cells.
Translation is the second phase of protein synthesis. This process occurs in the cytoplasm in an organelle called the ribosome. Where the strand of RNA is deciphered to synthesize peptides.
the large intestine primarily
