In this lesson our instructor talks about viral structure and genetics. First she talks about structure of viruses, overview of viral reproduction, the lytic cycle, and the lysogenic cycle. Then, she discusses RNA viruses, retroviruses, and prions. Four complete example videos round up this lesson.
consist of nucleic acid enclosed in a protein capsid. Some viruses
are covered by an envelope derived from the host cell membrane.
cannot reproduce independently. To reproduce, they must infect a
host cell and use the host cell's machinery to produce viral
nucleic acids and proteins.
may reproduce either via the lytic cycle or the lysogenic cycle.
the lytic cycle, the virus attaches to the host cell and then
injects its genetic material. A viral enzyme degrades the host DNA
and the host cell's machinery is used to synthesize viral nucleic
acids and proteins. The phage self-assemble and the bacterial cell
is lysed to release the newly produced phage.
the lysogenic cycle, phage DNA integrates into the bacterial genome
and is replicated along with the bacterial DNA. An environmental
cue, such as UV light, can trigger the phage to be excised from host
DNA and enter the lytic cycle.
sense RNA viruses contain RNA that can be translated directly into a
protein. Negative sense RNA viruses contain RNA that serves as a
template for the synthesis of mRNA.
synthesize complementary DNA (cDNA) from an RNA template using the
enzyme reverse transcriptase. HIV is a retrovirus.
Viral Structure and Genetics
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.
The book and CD package include three full length practice exams that are presented with all questions answered and explained. The author also presents detailed reviews of all test topics and includes multiple-choice and free-response questions with answers at the end of each topic's chapter.
This book has a great topic-by topic breakdown of the 14 must-know principles with sample questions and answers for each of the subjects. Laboratory Review includes a focused review of all 12 AP laboratory exercises. Included in this is 2 full length practice tests that stimulate the actual test along with answers and complete explanations.
This book includes a comprehensive biology test topic review, covering everything from photosynthesis to genetics to evolution. Cracking the AP Biology also includes testing strategies for the grid-in and essay section, great guidance on writing a high-scoring essay, and two full length practice exams with detailed explanations.