The primary site of photosynthesis in most plants is the:
A. stems.
B. roots.
C. shoots.
D. buds.
E. leaves.
E
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How does DNA structure relate to its function?
A) The three-dimensional structure allows DNA to catalyze chemical reactions. B) The order of nucleotides in a DNA strand specifies the order of amino acids in a protein. C) DNA folds in a variety of shapes, each with a unique function. D) The three-dimensional shape of DNA is critical for the storage of genetic information.
Arrange the steps of antibody-mediated immunity in the proper order
1. Plasma cells secrete antibodies. 2. Helper T cells interact with B cells displaying the same antigen-MHC complex. 3. Contact with antigen. 4. Clones of B cells produced. 5. Fragmentation of antigen.
a. 3, 2, 5, 1, 4 b. 3, 5, 2, 4, 1 c. 1, 3, 5, 2, 4 d. 4, 3, 2, 1, 5 e. 5, 3, 4, 2, 1
An ectopic pregnancy occurs when a fertilized egg implants somewhere other than in the lining of the uterus. Usually it implants in the oviduct. Which of the following would be the most likely explanation for such a pregnancy being unsuccessful?
A) The orientation of the baby would be sideways. B) Human chorionic gonadotropin (hCG) cannot be produced in the oviduct. C) The lining of the oviduct is unable to support the developing fetus. D) The necessary hormones cannot reach the developing fetus in the oviduct.
In the Breathalyzer, ___ ethyl alcohol molecules react with ___ potassium dichromate molecules.
Fill in the blank(s) with the appropriate word(s).