The undifferentiated genitalia of an early human embryo develops into male genitalia under the influence of ____
a. oxytocin
b. prostaglandin and DHT
c. prolactin
d. testosterone, AMH, and DHT
e. Wolfian duct inhibitors
d
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Due to a genetic defect, an individual is unable to make T cytotoxic cells. Predict the most likely consequence.
A. The individual will have SCID (severe combined immunodeficiency disease). B. The person will have frequent infections caused by Staphylococcus and Streptococcus. C. The person will not be able to adequately fight viral infections and infections caused by intracellular bacteria. D. The individual will not be able to synthesize any antibodies.
What is the relationship between operators, transcription units, and operons?
a. Operators are comprised of transcription units and operons. b. Operons are comprised of transcription units and operators. c. Operators are comprised of multiple transcription units associated with a single operon. d. Operons are comprised of multiple operators associated with a single transcription unit. e. Operons are comprised of multiple transcription units associated with a single operator.
Which of the following breaks most slowly during decomposition
A) simple sugars
B) cellulose
C) chitin
D) lignin
Which of the following statements regarding antigens and antibodies is false?
A) An antibody usually recognizes and binds to an antigenic determinant. B) A single antigen may stimulate the immune system to make several distinct antibodies to it. C) Most antigens are proteins or large polysaccharides on the surfaces of viruses or foreign cells. D) Each antibody has only one antigen-binding site.