Domain bacteria is similar in many ways to domain archaea, but there are a few fundamental differences. Both contain prokaryotes that lack a true nucleus and membrane-bound organelles. Their cell walls contain peptidoglycan, which members of domain archaea do not. Bacteria can be aerobic or anaerobic and can also be classified as phototrophs, autotrophs, heterotrophs, and chemotrophs depending on their source of energy. Their structures can range from round to spiral-shaped and can contain plasma membranes and cell walls. Internally, they contain a nucleoid region, plasmid, and capsule basal apparatus as well as a filament, and externally may have flagella, basal apparatus, hook, and another filament. Their genome is a single, circular molecule of DNA and they reproduce through binary fission.
Domain Bacteria is composed of
prokaryotic organisms that have a circular chromosome and do not
have histones associated with their DNA. Additional genes may be
located on small, circular pieces of DNA known as plasmids.
Although they are unicellular,
bacteria can form colonies. A biofilm is a group of bacteria
aggregated together on a substrate.
Bacteria can be divided into
gram positive and gram negative types based on the amount of
peptidoglycan in their cell walls.
Some bacteria are covered by a
capsule that helps them to evade their host’s immune system.
Flagella area a means of
motility for bacteria and are composed of a basal apparatus,
filament and hook.
Bacteria reproduce asexually
through binary fission.
During conjugation, DNA is
transferred form one bacterial cell to another. The F factor codes
for a sex pilus through which the transfer takes place.
Bacteria play an important role
in biotechnology. Through the process of transformation, bacteria
take up DNA from their environment. The bacteria can then express
the gene, producing a protein.
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 two 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 includes a review of the AP Biology exam format and scoring, proven strategies for answering multiple-choice questions, and hints for tackling the essay questions. The practice tests include answers and explanations and there is also proven test-taking strategies for both the multiple choice and essay parts.