Which immune system cell must be presented with antigen by an antigen-presenting cell such as a macrophage, in order to become appropriately activated?
A) B lymphocyte
B) plasma cell
C) macrophage
D) T lymphocyte
E) natural killer cell
D
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Hemoglobin transports oxygen in the blood and consists of a chain of 146 amino acids. How many different types of amino acids are used to construct proteins?
A. 2 B. 20 C. 146 D. 200
You modify the primary sequence of an enzyme in a region that will be the active site when the protein is properly
folded. What is the predicted outcome of this change?
a. The enzyme will not bind to the substrate properly. b. The enzyme will not be able to bind an allosteric inhibitor. c. The enzyme will have an increased rate of activity. d. There will be no change in the enzyme's function.
e. The enzyme will bind the substrate but not be able to release the products.Respond to statements 90–94 with reference to the flower parts
listed below. a. megaspore b. microspore c. ovule d. ovary e. seed D 90. This structure gives rise to the female gametophyte. D 91. This structure is female and haploid. M 92. This gives rise to haploid pollen grains. D 93. The egg is ultimately derived from this structure. D 94. During early development, the plant embryo is most intimately associated with this structure.
Which of the following organisms can perform photosynthesis?
a. vertebrates b. animals c. fungi d. algae e. invertebrates