Describe how bacteriophages influence the ocean's bacterial populations and nutrient cycling
What will be an ideal response?
Answer: Phages are responsible for killing up to 50% of the marine bacterial population each day. They also play a major role in horizontal gene transfer due to their ability to package DNA from one host and integrate the DNA it carries into other host bacterial cells. With cellular constituents released that would otherwise not be available for other organisms, cycling of these nutrients might be expected to occur at a quicker rate. Another potential hypothesis could be that nutrients are consumed during phage replication that other bacteria might use and are no longer available to the bacteria by instead being incorporated into phage particles.
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What can the mouthparts of an animal tell you about its diet?
A) Mouthparts of animals are specialized to obtain desired food items efficiently. B) Mouthparts provide clues about the type of digestion that goes on in the stomach. C) Mouthparts provide clues about the rate of nutrient absorption. D) Mouthparts of all animals are designed to reduce the size of the food particles ingested.
In the Watson–Crick model of DNA structure, the polynucleotide chains ____
a. are of unequal length b. are arranged with the bases forming the backbone of the helix c. form covalent bonds between uracil and adenine d. are oriented in the same direction e. are oriented in opposite directions
Provide an example of sex-influenced inheritance
What will be an ideal response?
Which activity is an example of biotechnology?
A. Bacteria in the soil secrete an antibiotic to kill competitors. B. Public health officials monitor diseases in a community. C. Humans use yeast to make beer and wine. D. A microbiologist uses a microscope to study bacteria. E. Mycobacterium tuberculosis causes tuberculosis in the lungs.