What is the process responsible for creating distinct, separate structures during embryological development, such as the toes visible in this image?
a. signal cascade
b. meiosis
c. apoptosis
d. signal transduction
c. apoptosis
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Enveloped viruses may enter their host cells by fusion of their envelope with the cytoplasmic membrane, thereby depositing their nucleocapsid within the cell.
Answer the following statement true (T) or false (F)
Why are nuclear localization sequences (NLS) not removed after nuclear proteins are transported to the nucleus?
A. It is too energetically costly for the cell. B. An NLS may be located almost anywhere along the primary sequence of the protein. C. mRNA molecules are synthesized in the nucleus. D. The nuclear envelope breaks down with each cell division.
Water molecules stick to other water molecules because
A) water molecules are neutral, and neutral molecules are attracted to each other. B) hydrogen bonds form between the hydrogen atoms of one water molecule and the oxygen atoms of other water molecules. C) covalent bonds form between the hydrogen atoms of one water molecule and the oxygen atoms of other water molecules. D) the oxygen atoms of adjacent water molecules are attracted to one another.
From which vesicle does the neurohypophysis (posterior pituitary) descend?
A. Diencephalon B. Mesencephalon C. Metencephalon D. Myelencephalon E. Telencephalon