Normally, children cannot easily make understandable sentences until they are ________
A) 8 months old
B) 12 months old
C) 24 months old
D) 36 months old
D
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Answer the following statements true (T) or false (F)
1) Crossing-over occurs in meiosis I and meiosis II. 2) Chromosome duplication occurs between meiosis I and meiosis II. 3) In animal cells, cell division is accomplished by the formation of a cleavage furrow. 4) Daughter cells produced in meiosis are identical. 5) Chromosome duplication occurs prior to both mitosis and meiosis.
Action potentials ____
a. move backwards b. are examples of negative feedback c. are generated and completed in a matter of milliseconds d. are only generated regardless of whether or not the threshold potential is reached e. are all the same size
Which of the following characteristics of the structure of DNA was determined directly from X-ray diffraction photographs of crystallized DNA?
A. the double helical structure B. the length of a given DNA molecule C. the frequency of A versus T nucleotides D. the sequence of nucleotides
Which of the following contain enzymes used in the breakdown of glucose and generation of ATP?
a. Endoplasmic reticula b. Mitochondria c. Golgi bodies d. Lysosomes e. Ribosomes