Mad cow disease is caused by a
A. bacterium.
B. virus.
C. viroid.
D. virion.
E. prion.
E. prion.
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What immediately follows meiosis I?
A. DNA replication B. prophase II C. metaphase II D. synapsis of homologues E. crossing over of homologues
For biological clocks related to seasons, the critical input is day length or ____
Fill in the blank with the appropriate word.
Normal biota of the urinary tract in both genders include all of the following except ________.
A. nonhemolytic Streptococcus B. Staphylococcus C. Escherichia coli D. Corynebacterium E. Lactobacillus
Which phrase describes how identical twins can result?
a. from the fusion of two paternal gametes with a single maternal gamete that then divides b. from a lack of chromosomal separation during meiosis, resulting in gametes that are diploid and do not need to be fertilized c. from the fusion of two sets of identical gametes d. from a division of a zygote into two separate cells that develop into two separate embryos