What aspect of chromosome behavior most clearly accounts for Mendel's law of segregation?
A) movement of sister chromatids to opposite poles at anaphase II of meiosis
B) movement of homologous chromosomes to opposite poles at anaphase I of meiosis
C) crossing-over between homologous chromosomes during prophase I of meiosis
D) replication of chromosomes prior to meiosis
E) independent alignment of different homologous pairs on the metaphase I spindle
B) movement of homologous chromosomes to opposite poles at anaphase I of meiosis
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Dental plaque (a biofilm), a first stage in tooth decay, consists of
A. sugars. B. bacteria surrounded by a polysaccharide matrix. C. fluoride. D. lactic acid. E. bacteria and high pH.
What is the first step in urine formation? a. Glomerular filtration b. None of these choices
c. Urine concentration d. Tubular reabsorption e. Tubular secretion
Relaxed muscles, such as those generated by prolonged sitting, ____, resulting in ____
a. do not make ATP; higher blood glucose levels b. make excess ATP; lower blood glucose levels c. do not make ATP; lower blood glucose levels d. make excess ATP; higher blood glucose levels e. make normal amounts of ATP; stable blood glucose levels
A toxin that is secreted and acts upon a specific cellular target is called a(n)______
Fill in the blank(s) with the appropriate word(s).