Your friend read an article on the internet today about a new single-celled organism that has been discovered by scientists in Africa. She said the organism is the size of a mouse, and lives in freshwater streams. You tell her to check the source because you think she has read a hoax. How do you know?
1.Because an organism of that size would have been discovered years before now.
2.Single-celled organisms can’t survive in fresh water.
3.A single-celled organism could not attain that size. They are limited by surface-to-volume ratio.
4.There would have to be many more than one, since cells must come from other cells. If they only collected one, it must be a hoax.
3
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Starting with citrate, which of the following combinations of products would result from three acetyl CoA molecules entering the citric acid cycle (see the accompanying figure)?
A) 1 ATP, 2 CO2, 3 NADH, and 1 FADH2 B) 2 ATP, 2 CO2, 3 NADH, and 3 FADH2 C) 3 ATP, 3 CO2, 3 NADH, and 3 FADH2 D) 3 ATP, 6 CO2, 9 NADH, and 3 FADH2 E) 38 ATP, 6 CO2, 3 NADH, and 12 FADH2
At the time of its discovery in 1938, the coelacanth was believed to have been extinct for 66 million years. Coelacanths are unusual fish by any measure; able to grow to the same size and weight as an adult human, live for fifty to sixty years, with eight lobed fins, an intracranial joint that allows it to open its jaw surprisingly wide, and a cranium filled with far more fatty tissue than brain, the coelacanth is frequently described as a living fossil, and reportedly tastes terrible. To which class does the coelacanth belong?
a. Myxini b. Petromyzontida c. Sarcopterygii d. Actinopterygii
CO2 and H2O will not form glucose on their own because ____
a. CO2 does not contain sufficient energy b. H2O does not contain sufficient energy c. neither CO2 nor H2O contain sufficient energy d. the concentration of CO2 is too low in the atmosphere e. the bonds of CO2 and H2O are too stable to be broken without an input of energy
In twin studies, geneticists look for situations in which genetic and environmental influences are clearly
____________________.