Which of the following is a function of the digestive system?
A. make hemoglobin
B. transmit hormonal messengers throughout the body
C. search out and destroy foreign substances, including viruses and bacteria
D. absorb nutrients
E. eliminate nitrogenous waste
Answer: D
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Indicate whether the statement is true or false
An australopith is a(n) _____
a. craniate d. amniote b. vertebrate e. placental mammal c. hominoid f. all of these
Answer the following statements true (T) or false (F)
1. A GMO is a transgenic organism. 2. When the genetic material of multiple organisms has been combined, it is called recombinant DNA. 3. Bacterial plasmids are small units of self-replicating DNA that can be used as cloning vectors in genetic engineering. 4. Unlike in plants, the production of transgenic animals commonly relies on viruses as cloning vectors. 5. In current biotechnology (DNA technology) advancements, scientists ensure that the methods used have no risks or unethical procedures.
Which of the following is NOT true concerning the
spirochetes? a. Some live inside a host organism. b. Some form endospores that germinate in wounds. c. All are free-living. d. Some are pathogens carried by vectors. e. Some cause Lyme disease.