BLY 101 Exam 3 PT 3 questions well answered, Exams of Nursing

Download BLY 101 Exam 3 PT 3 questions well answered and more Exams Nursing in PDF only on Docsity!

BLY 101 Exam 3 PT 3

Single-celled organisms that are too small to be seen without a microscope - correct answer ✔✔Microorganisms ____________ are the smallest living organisms - correct answer ✔✔Bacteria T or F: Viruses are smaller than bacteria but are not "biologically" alive - correct answer ✔✔True Prokaryotes are comprised of two domains: - correct answer ✔✔Archaea and Bacteria T or F: both archaea and bacteria arose before eukaryotes - correct answer ✔✔True Most bacteria need to take their food from living hosts, as parasites, or dead organic matter, as saprobes. This nutritional form is called a) photoautotrophism b) chemoheterotrophism c) photoheterotrophism - correct answer ✔✔b The following are bacterial shapes a) coccus b) bacillus c) spirillum d) all of the above - correct answer ✔✔a Which is never found in a bacterium?

a) DNA b) cell wall c) nucleus - correct answer ✔✔c Cyanobacteria are primary producers in the plankton of marine ecosystems, converting solar energy into chemical energy. This means they are - correct answer ✔✔Photoautotrophs Archaean prokaryotes can be a) thermophiles b) halophiles c) methanogens d) all of the above - correct answer ✔✔d A typical virus will consist of a nucleic acid surrounded by _______ ________ - correct answer ✔✔protein coat HIV is a viral infection that spread out of the African continent into the rest of the world. This type of disease is said to be a) sporadic b) endemic c) pandemic - correct answer ✔✔c Which of the following macromolecules may be found within viruses? a) lipids b) proteins c) nucleic acids

d) carbohydrates e) all of the above - correct answer ✔✔e One reason viruses are considered nonliving is because they a) are missing a nucleic acid genome b) infect cells c) are unable to replicate without a host cell - correct answer ✔✔c What structure do many animal viruses acquire when exiting a host cell? a) an envelope made of phospholipids b) a protective protein coat c) a nucleic acid genome - correct answer ✔✔a Which group is most closely related to Archaea? - correct answer ✔✔Eukarya T or F: Archaea does not have peptidoglycans in the cell wall, but bacteria do - correct answer ✔✔True T or F: Archaea and bacteria have similar lipids in their cell membranes - correct answer ✔✔False, different Which characteristics do archaea and bacteria share? a) they have nearly identical cell wall and cell membrane structures b) they are both prokaryotes and both lack a nucleus c) they both have a single chromosome

d) they are both single-celled - correct answer ✔✔b, c, and d Cell reproduction process of bacteria and archaea; a type of asexual reproduction - correct answer ✔✔Binary fission Before binary fission is complete, the prokaryotic cell must replicate its a) nucleus b) circular genome c) organelles d) proteins - correct answer ✔✔b During the last stages of binary fission, which structures begin to fold inward separating the cell into two distinct sections? a) cell wall b) circular chromosome c) plasma membrane d) nucleus - correct answer ✔✔a and c Prokeryotic cells divide ______ in a process called _________ _________ - correct answer ✔✔asexually, binary fission