Answer the following statements true (T) or false (F)
1. The first truly bipedal primates were the australopithecines.
2. Our species, Homo sapiens, had been in existence for only somewhat more than 50,000 years when it moved out of Africa and replaced Neanderthal Man, another species of human, about 30,000 years ago.
3. Several species of humans have occurred together in the same time and place in the past.
4. The most recent fossil and DNA evidence supports the idea that modern humans (Homo sapiens) evolved from a single stock from Africa rather than from multiple stocks in different parts of the world.
1. TRUE
2. TRUE
3. TRUE
4. TRUE
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Pasteurization of milk
A. reduces microbial growth by decreasing availability of water. B. usually eliminates all disease-causing organisms. C. is a method for sterilization of food items. D. is no longer used for food processing in the United States.
In the process of aerobic respiration, nitrate can function as the terminal electron acceptor in the
electron transport chain. __________________ Indicate whether the statement is true or false.
A microbiologist is working with two genera of bacteria, A and B, to determine if cells are competent. Strains are grown under optimal conditions, and DNA fragments that carry the gene for green fluorescent protein are added to each culture at 20-minute intervals. Samples from each treatment are plated to nutrient agar and incubated, after which the plates are examined under an ultraviolet lamp. The microbiologist observes that all plates of bacteria B contain colonies that are fluorescent, while for bacteria A only the plates from stationary phase demonstrate fluorescent colonies. What can be concluded from these results?
A. Both bacteria A and bacteria B cells are competent. B. Competence in bacteria B is dependent on the phase of growth. C. Competence in bacteria A is constitutively expressed. D. Neither bacteria A nor bacteria B cells are competent.
Protein synthesis, would healing, immune function
What will be an ideal response?