What are some of the similarities and differences between DNA and RNA?
Soap and detergent molecules have a long, hydrophobic tail and a polar, hydrophilic head.
They are sometimes referred to as bridge molecules because they allow oils and fats to be suspended and dissolved in water (which they otherwise would not be able to do). Imagine that you are using soap to wash away dirt that is being held against your skin in an oily film.
DNA uses the nucleotides A-T-G-C, and RNA uses the nucleotides A-U-G-C. DNA uses a deoxyribose sugar, and RNA uses a ribose sugar. DNA is usually double-stranded, and RNA is usually single-stranded.
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Match the following items with the correct phrases.
_______1. _______________ are chemical mediators that enable cells to communicate with each other. _______2. When attached to the surface of particles or cells, ____________________ can facilitate phagocytosis. _______3. Proteins produced by one bacterial species that kill other bacterial species are known as ____________________. _______4. ____________________ are small, antiviral proteins that are produced by virus-infected cells. _______5. ____________________ attract leukocytes to sites where they are needed. a. bacteriocins b. chemotactic agents c. complement fragments d. cytokines e. interferons
Which of the following statements are TRUE about the structure of hemoglobin? (Select all that apply.)
a. The hemoglobin molecule is a protein made up of four subunits bound together. b. Each of the four heme groups in a hemoglobin molecule contains one atom of iron (Fe2+), to which molecular oxygen binds. c. 2,3 diphosphoglycerate increases hemoglobin's affinity for oxygen. d. The relationship between the percentage of saturation of hemoglobin and PO2 is linear.
A 0.1 ml sample of a log phase culture contains 10,000 bacterial cells/ml. It is added to 9.9 ml of fresh culture medium broth. Assume a generation time of 30 minutes, and no limiting nutrients. How many bacteria will be present in the entire broth culture after five hours?
A) 3.2 × 104 B) 5.0 × 105 C) 1.02 × 106 D) 6.0 × 106 E) 2.56 × 107
Blood glucose levels must be carefully maintained within a narrow window. What endocrine organ is responsible for this task?
A. Pancreas B. Pituitary gland C. Pineal gland D. Parathyroid gland