Which of the following elements may have
been the ancestors of cellular life?
a. circular RNA
b. prokaryotic cells
c. pseudocells
d. lipid globules
e. protocells
E
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Which part of the neuron is responsible for receiving information?
A. axon B. dendrite C. soma D. nucleus E. axon hillock
The type of contraception that functions by preventing implantation, even after successful fertilization, is ____
a. tubal ligation b. spermicidal jelly c. birth control pills d. morning after pills e. diaphragm
What is a typical feature of K-selected organisms?
a. early reproduction b. fast development c. a low reproductive rate d. small body size
e. little parental care of offspringSemen is composed of secretions or cells produced in all of the following structures EXCEPT
A. the prostate gland. B. seminal vesicles. C. the testes. D. bulbourethral glands. E. vas deferens.