Select all of the following statements that describe the structure of a molecule of DNA.A) twisted double helixB) single-strandedC) contains the nitrogenous bases, adenine, thymine, cytosine, and guanineD) contains deoxyribose sugarE) contains the nitrogenous bases adenine, uracil, cytosine, and guanine
What will be an ideal response?
A, C, D
DNA is a twisted double helix that contains deoxyribose sugar and four nitrogenous bases, adenine, thymine, cytosine, and guanine.
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A(n) ____ environment is ideal for plant cells, while a(n) ____ environment is best for animal cells
a. isotonic; hypotonic b. hypotonic; isotonic c. hypotonic; hypertonic d. hypertonic; isotonic e. isotonic; isotonic
How are amino acids different from one another?
a. The R-group, or side chain, is different in each amino acid. b. The central backbone of the amino acid molecule is different in each one. c. The amino group is different in each one. d. The carboxyl group is somewhat variable in each one.
The ___ delivers oxygen-rich blood to the left
atrium.
a. vena cavae b. pulmonary artery c. pulmonary vein d. aorta e. right atrium
A newspaper ad for a local toy store indicates that an inexpensive toy microscope available for a small child is able to magnify specimens nearly as much as the more costly microscope available in your college lab
What is the primary reason for the price difference? A) The toy microscope does not have the same fine control for focus of the specimen. B) The toy microscope magnifies a good deal, but has low resolution and therefore poor quality images. C) The college microscope produces greater contrast in the specimens. D) The toy microscope usually uses a different wavelength of light source.