38. Abnormally high concentrations of have been found in rocks dating from the e
ID: 278594 • Letter: 3
Question
38. Abnormally high concentrations of have been found in rocks dating from the end of the Cretaceous period A) Lithium B) Iridium C) Mercury D) Nickel E) Tungsten 39. Which of the following occurs with a synonymous mutation? A) The protein produced is changed. B) The amino acid being coded for does not change. C) The amino acids being coded for change. D) All of the above The biological species concept defines a species as a group of A) actually interbreeding natural populations that are reproductively isolated from other such groups B) potentially interbreeding natural populations that are reproductively isolated from other such 40. groups. C) actually or potentially interbreeding natural populations that are reproductively isolated from other such groups D) actually or potentially interbreeding natural populations that are reproductively connected to other such groups. E) actually interbreeding natural populations that are reproductively connected to other such groups. 41. The common sea lettuce, Ulva lactuca, is said to have an isomorphic life cycle. Which of the following statements about this species is true? A) The sporophyte and the gametophyte look virtually identical. B) The diploid and haploid stages of the life cycle are morphologically different from each other C) The male and female gametes are different sizes. D) All of the above E) None of the above Match the following: A) Diatoms 42. This organism stores silica in it's cell wall. 43. This term refers to a condition where different B) Chlamydias organsims live together, one inside of the other. 44. These organisms can cause a sexually transmitted disease as well as some types of pneumonia lives in the mosquito. volcanic eruption that can block out the sun and D) Endosymbiosis 45. This is one of the places where Plasmodium E) Salivary glands 46. This is one of the main components following a reduce surface temperatures.Explanation / Answer
Answer= 38]Abnormally high concentration of Iridium have been found in rocks dating during the end of Cretaceous period.
B]Iridium
----------------------------------------------------------------------------------------------------------------------------------------------------------39] The following occurs with a synonymous mutation
B]the amino acid being coded for does not change.
explaination- Synonymous mutation is a change in the DNA sequence that codes for amino acids in a protein sequence ,but does not change the encoded amino acid,due to the redundancy of the genetic code.
it means that the protein product does not change.
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40] the biological species concept defines a species as a group of
B]Potentially interbreeding natural population that are reproductively isolated from other such groups.
Explaination-Biological species concept is most widely accepted species in terms of interbreeding.
Ernst mayr defined a species as ,"species are groups of natural population that are reproductively isolated from other such groups."
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