Question:
The haversian system (osteon) is
- found only in cancellous bone. b. the red bone marrow. c. the connective tissue that surrounds a long bone. d. the cylindrical arrangement of dense bone.
Answer
- the cylindrical arrangement of dense bone.
Explanation:
Haversian system refers to the basic cylindrical-shaped structural unit of a compact bone which is a substantial part of long bones in our body. Haversian system contains the blood vessels, nerve fibers. These cylindrical structures contain mineral matrix as well as living osteocytes for the transport of blood. Communications between haversian systems and bone cells is through connections called canaliculi.
Question:
Which viral type has a genome that can be directly translated? (choose all that apply)
Group of answer choices
ss(-)RNA
dsDNA
ss(-)DNA
ss(+)RNA
ss(+)DNA
Answer
Explanation:
When a virus enters the host cell, the genome must be released from the capsid and incorporated to the host genome. Viral genome can be translated directly if it contains a (+)sense single stranded RNA. If the virus contains a negative sense RNA strand, it has to be converted to a positive RNA by RNA polymerase before translation begins. If the genome is DNA, translation cannot happen directly, rather, mRNA strand must be formed first.
