top hat questions

which antibiotic attacks the cell wall

-Vancomycin -Carbenicillin Ampicillin

Which of the following types of RNA is known for its catalytic abilities? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a dsRNA b mRNA c rRNA d tRNA Submitted:

C

which antibiotic attacks the protein synthesis of 50s?

Clindamycin Erythromycin

Moist-heat sterilization protocols require the use of higher temperatures for longer periods of time than do dry-heat sterilization protocols do.

F

The A-T base pair has more hydrogen bonding than the C-G base pair. Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a True b False

FALSE

Which of the following is not a type of β-lactam antimicrobial? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a penicillins b glycopeptides c cephalosporins d monobactams

glycopeptides

which antibiotic attacks the protein synthesis of 30S?

Streptomycin tetracyline gentamicin

Ionizing radiation can penetrate surfaces, but nonionizing radiation cannot. Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a True b False

T

The work of Rosalind Franklin and R.G. Gosling was important in demonstrating the helical nature of DNA. Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a True b False

TRUE

The enzyme-regulated ENERGY-REQUIRING REACTIONS are mostly involved in Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a catabolism b anabolism c photosynthesis d oxidation

anabolism

Many chemical preservatives, such as potassium sorbate, preserve food products in which of the following ways? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a by damaging cell membrane b by changing pH c by altering enzymes d by drying foods

b

Which of the following peroxygens is widely used as an inexpensive antiseptic to clean wounds and contact lenses and breaks down into water and oxygen gas? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a benzoyl peroxide b hydrogen peroxide c ozone d peracetic acid

b

Which of the following are organic molecules that help enzymes work correctly? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a cofactors b coenzymes c holoenzymes d apoenzymes

b coenzymes

Which of the following is not a type of β-lactam antimicrobial? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a penicillins b glycopeptides c cephalosporins d monobactams

b glycopeptides

Which of the following would most likely contribute to the development of a superinfection? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a long-term use of narrow-spectrum antimicrobials b long-term use of broad-spectrum antimicrobials c short-term use of narrow-spectrum antimicrobials d short-term use of broad-spectrum antimicrobials

b long-term use of broad-spectrum antimicrobials

Which of the following terms refers to the ability of an antimicrobial drug to harm the target microbe without harming the host? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a mode of action b therapeutic level c spectrum of activity d selective toxicity

selective toxicity

Plasmodium causes what disease?

malaria

During denaturation of DNA, which of the following happens? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a Hydrogen bonds between complementary bases break. b Phosphodiester bonds break within the sugar-phosphate backbone. c Hydrogen bonds within the sugar-phosphate backbone break. d Phosphodiester bonds between complementary bases break.

A

Ribosomes are composed mostly of RNA. Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a True b False

A

Ribosomes are composed of rRNA and what other component? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a protein b polypeptides c DNA d mRNA

A

Paramecium

A ciliated (it propels itself via cilia) protist that lives in fresh water and eats other tiny organisms for food.

which antibiotic attacks the plasma membrane

Bacitracin

Double-stranded RNA is commonly found inside cells. Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a True b False

B

Which of the following statements about base pairing in DNA is incorrect? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a Purines always base pairs with pyrimidines. b Adenine binds to guanine. c Base pairs are stabilized by hydrogen bonds. d Base pairing occurs at the interior of the double helix.

B

Which of the following types of RNA codes for a protein? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a dsRNA b mRNA c rRNA d tRNA

B

If 30% of the bases within a DNA molecule are adenine, what is the percentage of thymine? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a 20% b 25% c 30% d 35%

C

Which of the following may use RNA as its genome? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a a bacterium b an archaeon c a virus d a eukaryote

C

A nucleic acid is purified from a mixture. The molecules are relatively small, contain uracil, and most are covalently bound to an amino acid. Which of the following was purified? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a DNA b mRNA c rRNA d tRNA

D

Which of the following is not found within DNA? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a thymine b phosphodiester bonds c complementary base pairing d amino acids

D

African sleeping sickness is caused by

Trypanosoma brucei

MATCH to the correct description ___tRNA ___rRNA ___mRNA is a major component of the ribosome carries an amino acid to the ribosome is a copy of the information in a gene

___tRNA carries an amino acid to the ribosome Press space or enter to grab is a major component of ribosome ___rRNA is a major component of ribosome Press space or enter to grab is a copy of the information in a gene ___mRNA is a copy of the information in a gene

Which of the following microbial control methods does not actually kill microbes or inhibit their growth but instead removes them physically from samples? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a filtration b dessication c lyophilization d radiation

a

Apoenzymes are inactive by themselves and must be activated by Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a cofactors b ATP c holoenzymes d substrates

a cofactors

Which of the following microbial control methods does not actually kill microbes or inhibit their growth but instead removes them physically from samples? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a filtration b desiccation c lyophilization d nonionizing radiation

a filtration

Enzymes increase the speed of a chemical reaction by Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a lowering the energy of activation b increasing the energy of activation c increasing the frequency of collisions of the reactants d decreasing the frequency of collisions of the reactants

a lowering the energy of activation

Which of the following does not bind to the 50S ribosomal subunit? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a tetracyclines b lincosamides c macrolides d chloramphenicol

a tetracyclines

Enzymes work by which of the following? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a increasing the activation energy b reducing the activation energy c making exergonic reactions endergonic d making endergonic reactions exergonic

b reducing the activation energy

Which of the following refers to a disinfecting chemical dissolved in alcohol? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a antiseptic b disinfectant c tincture d iodophor

c

Which of the following is not an appropriate target for antifungal drugs? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a ergosterol b chitin c cholesterol d β(1→3) glucan

c cholesterol

Which of the following antimicrobials inhibits the activity of DNA gyrase? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a polymyxin B b clindamycin c nalidixic acid d rifampin

c nalidixic acid

To which of the following does a competitive inhibitor most structurally resemble? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a the active site b the allosteric site c the substrate d a coenzyme

c the substrate

Which of the following terms is used to describe the time required to kill all of the microbes within a sample at a given temperature? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a D-value b thermal death point c thermal death time d decimal reduction time

c thermal death time

Which of the following terms refers to the ability of an antimicrobial drug to harm the target microbe without harming the host? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a mode of action b therapeutic level c spectrum of activity d selective toxicity

d selective toxicity

Which of the following methods brings about cell lysis due to cavitation induced by rapid localized pressure changes? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a microwaving b gamma irradiation c ultraviolet radiation d sonication

d sonication

Which of the following molecules is reduced? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a NAD bFAD cO2 dNADPH

d. NADPH

Which clinical situation would be appropriate for treatment with a narrow-spectrum antimicrobial drug? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a treatment of a polymicrobic mixed infection in the intestine b prophylaxis against infection after a surgical procedure c treatment of strep throat caused by culture identified Streptococcus pyogenes d empiric therapy of pneumonia while waiting for culture results

treatment of strep throat caused by culture identified Streptococcus pyogenes

Eugelana

uses flagellum to propel cell

amoeba cell membrane

uses lobe like pseudopodia to anchor to the cell

Candida albicans

yeast infection