What was the likely fate of the first life on
earth?
a. destroyed by a meteorite
b. outcompeted by multi-celled organisms
c. consumed by dinosaurs
d. poisoned by oxygen gas
e. starvation
D
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In a reaction that is believed to be similar to pre-biotic chemical reactions, H2S can combine with FeS to form ____
Fill in the blank with the appropriate word.
An integrated set of hypotheses that together explain a broader set of observations is considered a(n)
A) experiment. B) educated guess. C) fact. D) theory.
Consider the following genetic study involving two autosomal genes. One of these, eye colour, has the dominant allele (R) for red eye colour and the recessive allele (r) for yellow eye colour. The other has the dominant allele (T) leading to paws with thumbs, while the recessive allele (t) codes for paws without thumbs. Presuming no linkage between the genes, what should be the phenotype ratio of the offspring produced by a testcross (RrTt ? rrtt)?
a. 1 red-eyed with thumbs: 1 yellow-eyed without thumbs b. 3 red-eyed with thumbs: 1 yellow-eyed without thumbs c. 1 red-eyed with thumbs: 1 yellow-eyed with thumbs: 1 red-eyed without thumbs: 1 yellow-eyed without thumbs d. 9 red-eyed with thumbs: 3 yellow-eyed with thumbs: 3 red-eyed without thumbs: 1 yellow-eyed without thum
What is rubisco?
a. The least abundant protein on earth b. A molecule that is combined to make the six-carbon sugars glucose and fructose in the Calvin cycle c. An intermediate form of glucose produced during photosynthesis d. An enzyme involved in the Calvin cycle e. An accessory chemical that enables plants to build food molecules