What does superoxide dismutase do? Catalase? What groups of organisms possess these enzymes?
What will be an ideal response?
Answer: Superoxide Dismutase (SOD) is a class of enzymes that repairs cells and reduces the cellular damage caused by the most common free radical in the body called superoxide. SOD acts as a catalyst which causes the dismutation of superoxide into oxygen and hydrogen peroxide.
Catalase is a common enzyme found in nearly all living organisms exposed to oxygen (such as bacteria, plants, and animals). It catalyzes the decomposition of hydrogen peroxide to water and oxygen. It is a very important enzyme in protecting the cell from oxidative damage by reactive oxygen species (ROS).
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Electrons are shared in bonds called
a. covalent bonds. b. ionic bonds. c. polar bonds. d. nonpolar bonds. e. all of these except ionic bonds
Given an inheritance pattern of incomplete dominance and 81 flowers that are red (R1R1), 18 flowers that are pink (R1R2), and 1 flower that is white (R2R2), the frequency of the R1 allele is 0.9
Indicate whether the statement is true or false
When first used in medicine in the 1940s, penicillin was uniformly effective in killing the bacterium Staphyloccocus aureus. Today, ____________________ has led to an increase in antibiotic-resistant alleles, and humans are increasingly at risk from untreatable Staphyloccocus aureus infections.
a) uncleanliness in hospitals b) natural selection in Staphyloccocus aureus populations c) natural selection in human populations d) the substitution of methicillin for penicillin e) molecular genetics
The hormones secreted by the anterior pituitary are ____.
A. peptide hormones B. neurotransmitters C. steroid hormones D. second messengers E. polar