Which region in a tRNA bonds with mRNA during translation?
a. the aminoacylation site
b. the anticodon
c. the cloverleaf
d. the TATA box
Ans: b. the anticodon
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This cellular structure lacks a membrane:
A. microbody B. nucleus C. nucleoid D. endoplasmic reticulum E. Golgi body
Which of the following is true of both neurotransmitters and hormones?
A. They are both involved in paracrine signaling. B. They both interact with receptors inside or on the surface of target cells. C. They are both produced in glands. D. They both travel through the bloodstream to target cells. E. They both influence the activity of multiple organs simultaneously.
All of the following are usually a part of the aging of reproductive systems EXCEPT
a. declining levels of estrogen. b. menopause. c. loss of sexual response. d. decreased fertility. e. declining testosterone levels.
According to the experiments of Delph and colleagues (1996 ), is sexual selection often stronger for male or female flowers, and what tends to drive this selection?
What will be an ideal response?