Receptors on the surface of ____________________ T cells recognize the antigens displayed on the surface of an
infected cell. Fill in the blank(s) with the appropriate word(s).
CD8
CD8+
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Which of the following is not a feature of a seed?
A. It contains a protective coat formed from the outer layers of ovule cells. B. The embryo is surrounded by nutritive tissue or has cotyledons that contain nutritive tissue. C. It contains a large percentage of water to support the embryo. D. It is a complex structure that allows the embryo to be dispersed to distant sites. E. Environmental signals such as light or temperature can trigger germination.
In 1902, Archibald Garrod linked inheritance to proteins when he noted that
A) inherited metabolic disorders in humans are associated with missing enzymes. B) substances in cells could transform bacteria from nonvirulence to virulence. C) proteins are made up of amino acids. D) the substance that transmits traits is in the cell nucleus.
A cell is in metaphase if:
a. the chromosomes are visible as threadlike structures. b. the nuclear envelope is clearly visible. c. the chromosomes are aligned at the midplane of the cell. d. the chromosome are separated into distinct groups at opposite poles of the cell. e. cytokinesis is occurring.
When club fungi reproduce sexually, which of the following occurs?
A) Two mushroom caps from different fungi exchange genes. B) Two spores merge into a seed that produces hyphae. C) Sperm and egg cells fuse. D) Nuclei from two different fungi fuse.