midterm in bs13

7/28/2019 Midterm in Bs13

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Pamantasan ng MontalbanKasiglahan Village, San Jose Rodriguez Rizal

College of Education

Summer2013

Midterm Examination in BS 13

Name: ______________________________ Yr. & Sec.:_____________Date:_____________Score:_____

I. Encircle the letter of the best answer. 2 pts each.

1. Which of the following is NOT true of the lytic cycle of a virus?

A. The virus injects its DNA or RNA into the host cell.

B. The viral DNA is used to make more viral proteins.

C. The virus incorporates its DNA into the host cells chromosome, replicating each time

the host cell divides.

D. The host cell undergoes cell lysis, and replicated viruses go and infect other cells.

2. Most scientists do not classify viruses as living things. All of the following are cited as reasons to

exclude viruses as living things EXCEPT

A. Viruses cant harness the energy from their environment that they need to grow,

reproduce, etc.

B. Viruses lack the machinery necessary to synthesize proteins.

C. Viruses are intracellular parasites.

D. Viruses lack the machinery necessary to replicate and transcribe their geneticmaterial.

3. During the nineteenth century, a physician named Edward Jenner noticed that cows get adisease called cowpox, which is similar in its symptoms to a disease that infects humans calledsmallpox; however, humans can't contract cowpox. Jenner also noticed that milkmaids wereimmune to smallpox. Jenner infected a child with the pus from a cowpox blister, and foundthat the child was subsequently immune to smallpox. How did the child develop immunity tosmallpox?

A. The cowpox virus was so similar to the smallpox virus that it stimulated"immunological memory" of the smallpox virus.

B. The cowpox virus prevented the smallpox virus from entering the lysogenic cycle.C. The cowpox virus prevented the smallpox virus from entering the lytic cycle.

D. The child had a particularly strong immune system that prevented him fromcontracting smallpox

4. In addition to bacteria and viruses, prions are also known to cause human diseases. Likeviruses, prions are not living organisms but are a type of disease-carrying organic molecule. Inwhich category of organic molecules are prions?

A. Proteins

B. Nucleic acids

C. Lipids


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D. Carbohydrates

5. If "success" of a group of organisms is defined by such parameters as nutritional diversity,longevity, pervasiveness, ability to adapt, and ability to withstand the most hostile ofenvironments, then which of the following groups of organisms is most successful?

A. Bacteria

B. ProtistsC. FungiD. Humans

6. Bacteria fill many roles that benefit life on Earth. Which of the following is one of these roles?A. They live symbiotically with other organisms, often producing essential compounds for

their host.

B. They decompose dead organic material.C. They allow usable forms of nitrogen to enter the food chain.D. All of the above are correct

7. Which domain contains organisms that live in the most extreme of environments, such as

those prevalent around deep-sea hydrothermal vents or hot springs?A. Bacteria

B. Eukarya

C. Archaea

D. Fungi

8. Most protists reproduce by both sexual and asexual mechanisms. Which mechanism occursmost frequently and why?

A. asexually, for speed of reproduction

B. sexually, for speed of reproduction

C. asexually, for the genetic diversity and speed of reproduction.

D. asexually, for the genetic diversity

9. Plant-like protists are mostly plant-like due to their ability:

A. do cellular respiration

B. Photosynthesize

C. Metaboloize

D. All of the above

10.Animal-like protists are unique in that some can:A. do cellular respiration and photosynthesis

B. do cellular respiration

C. do cellular respiration and metabolism

D. do photosynthesis and metabolism

11.Which of the following statements concerning protists is incorrect?A. Protists are composed of prokaryotic cells.

B. Protists can be photosynthetic.

C. Protists can reproduce by producing and releasing spores

D. Protists can engulf and digest prey like animals.


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12.Which type of organism is NOT thought to have evolved from a primitive type of protist?

A. Fungi

B. Plants

C. Animals

D. Archaea

13.Which of the following is TRUE of theArchaea?A. Exhibit great metabolic diversity

B. Can stain gram positive or gram negative

C. Most reproduce by binary fission

D. All of the above

14.The deinococci are gram-positive cocci and rods that are distinctive in their unusually greatresistance to

A. RadiationB. Dessication

C. Radiation and dessication

D. Extreme temperatures

15.Which of the following is not a group of photosynthetic bacteria?A. The green bacteria

B. The purple bacteria

C. The cyanobacteria

D. All of these are group photosynthetic bacteria

16.Cyanobacteria have

A. a gram-negative cell wall.

B. a gram-positive cell wall.

C. an unique cell wall that is neither gram positive nor gram negative.

D. No cell walls

17.Proteobacteria are gram-negative bacteria of considerable importance asA. disease agents

B. nitrogen fixers

C. major experimental organisms

D. all of these

18.The low G + C gram-positive group containsA. clostridia, bacilli and lactobacilli

B. clostridia and relatives only

C. bacilli and lactobacilli only

D. bacilli only

19.Which of the following is responsible for food spoilage even in canned foods?A. Clostridium perfringens


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B. Clostridium botulinum

C. Clostridium tetani

D. Clostridium difficile

20.Which of the following genera produce useful antibiotics?A. Clostridium

B. Leuconostoc

C. Bacillus

D. All of these

21.Actinomycetes are usually found in __________ habitats.

A. Soil

B. Freshwater

C. Marine

D. All of these

22.Actinomycetes formA.

substrate mycelia.

B. aerial mycelia.

C. both substrate mycelia and aerial mycelia.

D. None of these

23.Actinomycetes form spores that areA. Asexual

B. are used for sexual reproduction

C. both asexual and sexual

D. they do not form spores

24.Which is true?

A. All protists have chlorophyll.B. Some protists are eukaryotic.C. Protists can be one-celled or many-celled organisms.

D. Protists live only in dry surroundings.

25.Which of these is NOT a classification of protists?A. Bacteria-like

B. Fungus-like

C. Animal- likeD. Plant- like

II. TRUE OR FALSE. Write the word TRUE if the statement is correct and FALSE if it is not.

___________1. The ability of the deinococci to resist radiation is due to an unusual ability to repair

chromosome damage, even fragmentation. true


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___________2. Cyanobacteria are so named because most species have a blue-green appearance

caused by the photosynthetic pigment phycocyanin.true

___________3. Some species of cyanobacteria can fix atmospheric nitrogen. true

___________4. Based on ribosomal RNA sequences, the protozoans appear to be a polyphyletic group.true

___________5. Ciliates reproduce sexually by binary fission.false

III. Define or give two characteristics of the following: 2pts. Each.

A. Archae

B. Protist

C. fungi

D. deinococci

E. proteobacteria

F. non-proteobacteria

midterm in bs13

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