The main purpose of a streak plate is to ______
a. grow many types of bacteria
b. obtain mixed colonies
c. seperate mixed bacteria into individual colonies
d. make multiple cultures
Answer: c. seperate mixed bacteria into individual colonies
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Which of the following statements about photoreceptors is NOT true?
A. A compound eye as seen in insects has many different visual units, each containing a lens. B. Photoreceptors differ in complexity in different kinds of animals. C. Image-forming eyes are found only in vertebrates. D. The simplest photoreceptors only recognize the presence and intensity of light. E. Eyespots in planaria allow the direction of light to be determined.
In mammals, blood with a low oxygen content enters the ________ of the heart
A) right atrium B) right ventricle C) left atrium D) aorta E) left ventricle
In an emergency, a person whose blood type is B may donate blood to a person whose blood
A. type is O but not A B. type is AB but not O C. has been depleted of complement D. type is A but not AB E. type is A but not O
Why do harmful agents cause the most severe birth defects during the embryonic period?
A) The mother's hormones are at the highest levels at this time. B) The embryo has not yet implanted into the uterus. C) This is the period when substances pass most easily through the placenta. D) This is a period of rapid differentiation when cells and tissues acquire specific functions and organs form.