The structure that transports the ovum to the uterus is the ________.
A) myometrium.
B) infundibulum.
C) uterosacral ligament.
D) fallopian tube.
E) vagina.
D) fallopian tube.
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If the DNA sequence for an enzyme lacked a stop codon, this would mean
A. transcription would not have an end point. B. DNA replication would not be possible. C. translation would not have an end point. D. the incorrect amino acid would be incorporated into the final enzyme at that point.
The integumentary system is protected by the action of cells that arise from bone marrow and migrate to the epidermis. Which of the following cells serve this function?
A) cells found in the stratum spinosum B) macrophages called epidermal dendritic cells C) keratinocytes, because they are so versatile D) tactile cells
The extrafollicular cells of the thyroid gland secrete calcitonin
Indicate whether the statement is true or false
Spatial summation occurs in a postsynaptic neuron
a. when several EPSPs from a single presynaptic input sum to reach threshold. b. when EPSPs from several presynaptic inputs sum to reach threshold. c. upon simultaneous interaction of an EPSP and an IPSP. d. when several IPSPs from a single presynaptic input sum to hyperpolarize the membrane. e. none of these answers.