What causes the annual growth rings of trees?
A) Damage caused by fungi that occurs during the wetter months
B) Residual bark left over when the trunk of the tree expands
C) Different growth rates at different times of the year
D) Sugars left over from the previous summer
C
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Which of the following mRNA modifications are common in human cells?
A. 5' cap addition B. intron removal and exon joining C. 3' poly-A tail addition D. alternative splicing E. 5' cap addition, intron removal and exon joining, 3' poly-A tail addition and alternative splicing
Which of the following is an example of a positive feedback loop?
a. maintaining body temperature b. blood pH levels c. uterine contractions during childbirth d. blood glucose levels
Which of the following can be defined as a collection of structures involved in emotions and memory?
A) CNS B) limbic system C) autonomic system D) parasympathetic system
A phage that can carry a larger piece of a bacterial chromosome would have what type of effect on cotransduction frequencies?
A. Raise the cotransduction frequency B. Lower the cotransduction frequency C. Have no effect on the cotransduction frequency