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Home ‣ Biochemistry ‣ Water, pH and Macromolecules See What Others Are Saying!
- Question
Buffer solutions
Options- A. will always have a pH of 7
- B. are rarely found in living systems
- C. cause a decrease in pH when acids are added to them.
- D. tend to maintain a relatively constant pH.
- Correct Answer
- tend to maintain a relatively constant pH.
- 1. Which of the following characteristics are common in lymphocytes, macrophages, and neutrophils?
Options- A. They are all part of the nonspecific immune response in vertebrates
- B. They are all part of the specific immune response in vertebrates
- C. They are all part of the internal defenses of nonvertebrates
- D. They are all types of white blood cells Discuss
- 2. The general expression for the appearance of a solute in an effluent is (where V is the elution volume of a substance , V0 void volume, kD distribution constant and Vi internal water volume)
Options- A. V = V0 + kDVi
- B. V = V0/Vi
- C. V = V0 - kDVi
- D. V/V0 = kDVi Discuss
- 3. An expression vector
Options- A. always contains an origin of replication
- B. usually contains a gene that confers antibiotic resistance to the bacterial host
- C. always contains DNA segments for the regulation of mRNA production
- D. all of the above Discuss
- 4. The RNA polymerases that transcribe bacterial DNA are
Options- A. multisubunit enzymes
- B. only active inside the cell
- C. interchangable with DNA polymerases
- D. highly glycosylated in their active forms Discuss
- 5. Lysozymes are found in
Options- A. plant cells
- B. animal cells
- C. microbial cells
- D. all of these Discuss
- 6. Transcription of each set of rRNA genes by RNA polymerasel produces
Options- A. a single 45S rRNA precursor molecule
- B. a single 5S rRNA precursor molecule
- C. a single 18S rRNA precursor molecule
- D. a single 28S rRNA precursor molecule Discuss
- 7. The rapid appearance of HIV-1 strains that are resistant to AIDS drugs is due in part to which of the following property of its reverse transcriptase?
Options- A. AZT (zidovudine) is too expensive to be taken in effective doses
- B. The RNase H domain of p66 causes error prone synthesis
- C. It lacks a proofreading exonuclease
- D. It has low affinity for the correct dNTP's Discuss
- 8. Which of the following is found on RNA but not DNA?
Options- A. Uracil
- B. Deoxyribose
- C. Phosphate
- D. Adenine Discuss
- 9. Small charged molecules, often biogenic amines function as
Options- A. hormones
- B. neurotransmitters
- C. both (a) and (b)
- D. none of these Discuss
- 10. What useful information can be found from a Van Deemter plot?
Options- A. The selectivity factor
- B. Optimum mobile phase flow rate
- C. Optimum column temperature
- D. Optimum column length Discuss
More questions
Correct Answer: They are all types of white blood cells
Correct Answer: V = V0 + kDVi
Correct Answer: all of the above
Correct Answer: multisubunit enzymes
Correct Answer: plant cells
Correct Answer: a single 45S rRNA precursor molecule
Correct Answer: It lacks a proofreading exonuclease
Correct Answer: Uracil
Correct Answer: both (a) and (b)
Correct Answer: Optimum mobile phase flow rate
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