Saturated fats have long, straight tails of fatty acids and can clump tightly together in cells and animal bodies. Unsaturated fats have kinks in their tails due to double bonds, which prevent them from packing together as tightly. Animals that are ectotherms (their body temperature fluctuates with the environment) need to keep their membranes fluid at cooler temperature and thus use in their membranes.
A. mostly unsaturated fats
B. mostly saturated fats
C. equal amounts of saturated and unsaturated fats
D. carbohydrates
E. proteins
A. mostly unsaturated fats
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The development of penicillin-resistant bacteria represents an example of ____
a. punctuated equilibrium b. speciation c. genetic drift d. microevolution e. mutation
Dormant structures formed by certain bacteria in response to unfavorable environmental conditions are called ____
a. capsids b. endospores c. endotoxins d. exotoxins e. heterocysts
Which of the following is TRUE of asexual reproduction?
a. It allows an individual’s genes to adjust to the environment. b. It produces greater genetic diversity. c. It is a good strategy if an organism lives in a constant, unchanging environment. d. It slows the accumulation of potentially harmful mutations. e. It allows only half of an individual’s genes to be passed on.
In pea plants, round peas are dominant (R) and shriveled peas are recessive (r), and yellow peas (shown as light gray in the Punnett square) are dominant (Y) and green peas (dark gray) are recessive (y). Using this information and the partial Punnett
square shown, what were the phenotypes of the parental plants that were used in this cross by Mendel? A) Rryy and RrYy B) Rryy and rrYy C) RRyy and rryy D) RrYy and RrYy