The fossil record is often incomplete, simply because scientists will never be able to discover some of the fossils that are buried deep in the Earth.
a. true
b. false
Answer: a. true
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An expanded definition of intelligence that goes beyond IQ is called ____________________ and includes verbal and
spatial abilities, memory, speed of perception, and reasoning.Fill in the blank(s) with the appropriate word(s).
Sputum from a patient with a history of tuberculosis due to Mycobacterium tuberculosis bacteria is collected and sent to the microbiology lab for analysis. X-ray analysis and an acid-fast smear made from the sputum indicate that the patient has active tuberculosis. The physician has requested that the sputum be analyzed for pathogen load, but because colonies of Mycobacterium typically take between 3 to 8 weeks to appear on agar, results from traditional culture methods are often delayed. If you were the microbiologist in this case, what would you do?
A. Set up a traditional culture on the sputum, then use the colonies for real-time PCR with primers to Mycobacterium tuberculosis DNA to quantify the pathogen load. B. Using the sputum, apply real-time PCR with primers to Mycobacterium tuberculosis DNA to estimate the pathogen load, then follow up with a traditional culture. C. Set up a traditional culture on the sputum, then use the colonies for end-point PCR with primers to Mycobacterium tuberculosis DNA to quantify the pathogen load. D. Using the sputum, apply end-point PCR with primers to Mycobacterium tuberculosis DNA to estimate the pathogen load, then follow up with a traditional culture.
A motor unit is
A) the bundle of axons that goes from the spinal cord to a muscle. B) one of the connective tissue-wrapped bundles of muscle fibers in a muscle. C) a motor neuron and all of the muscle fibers it controls. D) the muscle or group of muscles that accomplishes a specific movement.
A student wanted to plant an avocado seed to try to grow an avocado plant, but she could not tell which end of the seed was the bottom and which was the top. She asked her friends what she should do. Which friend's suggestion will have the highest
success of growing the avocado plant? A) One friend said it doesn't matter in which direction the seed is planted as long as there is a strong light on the soil, since the shoots will seek the light and turn the seed right side up. B) One friend said to put the seed in in any direction, because as the seed is watered, it will be able to detect the direction the water is coming from and point the shoots that way. C) One friend suggested a compromise: Put the seed sideways, since gravity will ensure that the shoots grow up and the roots grow down. D) One friend said just to put the seed in one direction or the other, because it will only sprout if it is in the right direction, and there's a fifty-fifty chance that it will be in the right orientation.