Ovulation is triggered primarily by
a. high levels of LH.
b. low levels of FSH.
c. high levels of chorionic gonadotropin.
d. high levels of estrogen.
e. high levels of progesterone.
Answer: a
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Answer the following statements true (T) or false (F)
1. Unmethylated CpG islands are correlated with inactive genes. 2. Loosely packed chromatin is said to be in an open conformation. 3. Alternative versions of proteins often have similar functions. 4. MicroRNAs increase the rate of mRNA translation.
A fisheries biologist tells you she is studying a cohort of salmon returning to their birth river. What can you infer about those salmon?
A. They are iteroparous. B. Most of them are one to three years old. C. They are the same age. D. They have a uniform distribution. E. They have a Type II survivorship curve.
In many respects, the events of prophase seem to be the reverse of those occurring in
____________________. What will be an ideal response?
Positive feedback differs from negative feedback in that _____
A) positive feedback benefits the organism, whereas negative feedback is detrimental B) the positive feedback's effector responses are in the same direction as the initiating stimulus rather than opposite of it C) the effector's response increases some parameter (such as body temperature), whereas in negative feedback it can only decrease the parameter D) positive feedback systems have only effectors, whereas negative feedback systems have only receptors