Use the concept of coevolution to explain the abundance of large mammals in Africa after the rise of
humans but their rapid demise in the Americas after the arrival of humans. What will be an ideal response?
In Africa, the large mammals were able to coevolve with human populations. They were able to adapt
to humans as they slowly went from harmless to dangerous with the advent of hunting skills. On the
other hand, the humans who arrived in the Americas were already skilled hunters. The native
mammals lacked the time to evolve to this new predator. In many ways, the arrival of humans in the
Americas had more in common with an invasive species.
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Identify the correct steps for cloning a gene of interest, then arrange them in the correct order
1. Transform the bacteria. 2. Incubate the DNA fragments and cut cloning vector with DNA ligase. 3. Use restriction enzymes to cut the gene of interest and the cloning vector. 4. Spread bacteria on medium containing lactose and ampicillin. 5. Spread bacteria on medium containing X-gal and ampicillin.
a. 4, 3, 1, 5 b. 3, 2, 5, 1 c. 3, 2, 1, 5 d. 2, 3, 1, 5 e. 3, 2, 1, 4
Parthenogenesis ____
a. is a form of sexual reproduction b. involves the growth and development of a sperm cell without fertilization c. involves the growth and development of an egg without fertilization d. occurs through budding e. always produces haploid offspring
Which of the following statements is not true regarding Clostridium difficile?
A. Infection is precipitated by broad-spectrum antibiotic therapy. B. It produces "rice-water" stools. C. It is a gram-positive, endospore-forming rod. D. It is part of the normal intestinal biota. E. It is also called pseudomembranous colitis.
Which of the following statements about the speed of impulse conduction in a neuron is true?
a. Longer axons can transmit impulses faster than shorter ones. b. Unmyelinated axons transmit impulses faster than myelinated ones. c. Shorter axons can transmit impulses faster than longer ones. d. Nerve impulses travel faster than the speed of light. e. Unmyelinated axons with larger diameters transmit impulses faster than ones with small diameters.