The correct answer is: B)of DNA between homologous chromosomes must happen before metaphase
Mitosis is a process of somatic cell division, whereby a single cell divides into two daughter cells that are genetically identical. There are five stages of mitosis:
1. Interphase- The cell grows and prepares for the division.DNA duplicates, two copies of chromosomes are formed
2. Prophase- duplicated chromosomes condense- become compacted and tightly wound. Mitotic spindle which organize the chromosomes is formed. Chromosomes attach to microtubules.
3. Metaphase-Chromosomes are lined up along the equator of the elongated cell (metaphase plate is formed).
4. Anaphase- the sister chromatids are moving to opposite ends of the elongated cell.
5. Telophase- chromatids are on the opposite ends and cell division is almost over.
The phase after these is cytokinesis where the cell's cytoplasm divides.
A common symptom that would alert the nurse that a preterm infant is developing respiratory distress syndrome is expiratory grunting.
An audible grunt (forced expiratory sound) in a newborn is a crucial indicator of pulmonary disease and reveals a small lung volume or functional residual capacity (FRC). The baby's FRC rises when breathing against a partially closed glottis, maintaining the alveoli's patent state.
In an effort to maintain FRC and avoid alveolar atelectasis, the glottis suddenly closes on expiration, causing a grunting sound. Achieving and maintaining physiologic FRC is crucial in the management of respiratory illnesses with poor compliance, such as RDS or TTN, because lung compliance is worse at very low or very high FRC.
Learn more about expiratory grunting here;
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<span>The scientific method</span>
The correct option is D.
Scientific knowledge is very dynamic, it changes all the time based on emergence of new evidence. When new evidence are discovered, the scientific knowledge that are already in use are usually modified based on the new discovery.<span />
