Why are pea plants (Pisum sativum) a good species for genetics studies?
A. They have many distinctly identifiable forms of genetic traits.
B. They can be self-fertilized for true-breeding genetic traits.
C. They produce large numbers of offspring (the peas).
D. All of the answer choices are correct.
E. Growth of pea plants is simple and easy.
D. All of the answer choices are correct.
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When cells of a facultative anaerobe such as Paracoccus denitrificans are growing under anaerobic conditions and using nitrate as the terminal electron acceptor, ________ nitrate reduction is occurring.
Fill in the blank(s) with the appropriate word(s).
What role did cyanobacteria play in shaping Earth’s environment?
a. They are single-celled organisms that are detritivores. b. They produced oxygen, which led to changes in Earth’s atmosphere. c. They evolved into the first plants that colonized land. d. They are the ancestral form of all life on Earth
The majority of carbon dioxide is carried as:
a. CO2 bound to red blood cells b. Bicarbonate ion in the plasma c. Hydrogen ion bound to red blood cells d. Water in the plasma
You are studying regulation of a prokaryotic operon. Experiments show that expression of the operon is increased when levels of biosynthetic product from that pathway are low. Based on this information, what is a likely mode of regulation?
A. The product binds a repressor, allowing it to bind the operator. B. The product binds a repressor, preventing it from binding the operator. C. The product binds an activator, helping RNA polymerase to bind the promoter. D. The product binds to the biosynthetic enzymes, blocking them directly.