BIOL 1020 Unit 2 Exam Questions And Answers 2021/2022

Question 4 Organisms that grow very slowly, are non-culturable, are present in very small numbers, or are mixed with a number of bacteria may still be identified using Selected Answer: D. PCR. Question 5 If the G+C content of two organisms is 45% in both Selected Answer: E. they may or may not be related. Question 6 For the next few questions use the terms in the list below to label the diagram. Question Selected Match 76. E. RNA polymerase. 77. D. Ribosome. 78. A. DNA polymerase. 79. C. Reverse transcriptase. 80. B. Ligase. Question 7 Viruses acquire envelopes around their nucleocapsids during Selected Answer: D. release. Question 8 Luminescence Selected Answer: E. All of the choices are correct Question 9 The size of the amplified DNA fragment generated during PCR is determined by Selected Answer: A. the locations to which the primers anneal. Question 10 Post-translational modification may include Selected Answer: D. the folding of the protein, often with the aid of chaperones AND the removal of the signal sequence Question 11 Comparatively greater energy is released when Selected Answer: E. oxygen is the final electron acceptor. Question 12 DNA transfer by conjugation is more efficient in a liquid medium setting, subjected to very mild agitation (stirring), rather than on an agar plate format. Why? Selected Answer: A. Direct cell-to-cell contact is required for this process, and this more likely to be achieved in the fluid liquid format than on an agar plate (especially for relatively non-motile types of bacteria) Question 13 Wolbachia are found only in Selected Answer: E. arthropods. Question 14 Protozoan classification is based on their means of Selected Answer: B. locomotion. Question 15 Why is it a good idea for a bacterial cell to be able to utilize glucose FIRST as an energy source (until it is used up), THEN switch to lactose? Selected Answer: D. Glucose is an easier compound to break down and obtain energy from than lactose AND it's about conservation of energy-why expend the energy to make the extra enzymes for breaking down lactose when glucose is right there and doesn't need extra enzymes for breakdown Question 16 Strong chemical mutagens may be used to treat cancer cells. Is this a good idea or a bad idea? Selected Answer: C. The idea is both good and bad; the mutagens are very good at killing cancer cells but depending upon the mode of administration, they could also be a danger to noncancerous cells. Question 17 All fungi have __________ in their cell walls Selected Answer: A. chitin. Question 18 The lagging strand Selected Answer: A. is necessary due to the properties of the enzymes and the antiparallel nature of DNA. Question 19 Treponema and Borrelia Selected Answer: B. are spirochetes. Question 20 For the next 12 questions select one of the following three choices to correctly complete each of the statements below. Question Selected Match Includes the attachment of viral DNA to the bacterial chromosome C. Transduction Involves a transfer of genes during a period of direct contact A. Conjugation Occurs in generalized and specialized forms C. Transduction Requires that competent cells be available B. Transformation Carries viral genes from bacterial chromosomes B. Transformation Was first observed by Griffith in pneumococci B. Transformation Involves F+ cells which are donor cells A. Conjugation Requires direct contact between donor and recipient cells A. Conjugation Could involve unencapsulated form becoming an encapsulated form B. Transformation Follows the lytic cycle of a bacteriophage C. Transduction Involves plasmids moving between live bacteria A. Conjugation Occurs when naked pieces of DNA are taken up from the environment C. Transduction