I think the correct answer from the choices listed above is option A. When crossing-over takes place, chromosomes exchange corresponding segments of DNA. Corresponding genes on non-sister chromatids are exchanged at chiasmata. Hope this answers the question.
All cells have selectively permeable membranes, which means that only they let certain important molecules inside the cell, while the others stay outside the cell.
This occurs by the process of diffusion or osmosis.
With respect to permissions for uses and disclosures, HIPAA divides health information into three categories. The information related to "treatment, payment and health care operations" is under consent. HIPAA provides a foundation of protection of personal health records of people. Generally, it prohibits a covered entity from disclosing a protected health record unless he is granted an authorization by the patient.
The survival of every ecosystem is dependent on the producers<span>. Without </span>producer s<span>capturing the energy from the sun and turning it into glucose, an ecosystem could not exist. On </span>land,plants<span> are the dominant </span>producers<span>. Phytoplankton, tiny photosynthetic organisms, are </span><span>the most common producers</span>
D: a nucleus
the prokaryote cell has no nucleus and for that matter no other membrane bound organelle
