According to the endosymbiosis theory of the origin of eukaryotic cells, how did mitochondria originate?
A) from infoldings of the plasma membrane, coupled with mutations of genes for proteins in energy-transfer reactions
B) from engulfed, originally free-living proteobacteria
C) by secondary endosymbiosis
D) from the nuclear envelope folding outward and forming mitochondrial membranes
Answer: B
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Shannon has considered herself an extremely healthy person for most of her life. She is a marathon runner and watches her diet very carefully. She has 8% body fat, weighs 105 pounds, and is 5 foot 10 inches tall
Why might Shannon's health still be of concern? A) She is overweight for her height. B) She likely has metabolic problems associated with high blood pressure. C) She doesn't have enough body fat for menstruation or pregnancy. D) She doesn't consume enough nutrients for normal bodily functions.
Together, inhalation and exhalation are referred to as ________
A) diffusion B) breathing C) active transport D) negative pressure
This bacterium's ability to survive in a human who is taking penicillin pills may be due to the presence of which of the following?
1. penicillin-resistance genes 2. a gram-positive cell wall 3. a gram-negative cell wall 4. an endospore
Most cellular work is accomplished by _____ energizing molecules by _____ them.
Fill in the blank(s) with the appropriate word(s).