. Abnormally high concentrations of Cretaceous period. A) Lithium B) Iridium C)
ID: 278586 • Letter: #
Question
. Abnormally high concentrations of Cretaceous period. A) Lithium B) Iridium C) Mercury D) Nickel E) Tungsten have been found in rocks dating from the end of the 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 40. The biological species concept defines a species as a group of actually interbreeding natural populations that are reproductively isolated from other such groups B) potentially interbreeding natural populations that are reproductively isolated from other such groups isolated from other ai oohat sereproducivety iol 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: 42. This organism stores silica in it's cell wall. 43. This term refers to a condition where different A) Diatoms B) Chlamydias C) H2SO4 organsims live together, one inside of the other. 44 . These organisms can cause a sexually transmitted disease as well as some types of pneumonia. 45. This is one of the places where Plasmodium D) Endosymbiosis lives in the mosquito. This is one of the main components following a volcanic eruption that can block out the sun and reduce surface temperatures. 6. E) Salivary glandsExplanation / Answer
38. Option B is correct.
It is hypothesized that a great extinction occurred due to a meteorite during the Cretaceous period. Due to this, Cretaceous rocks contain high amounts of Iridium.
39. Option C is correct.
Synonymous mutation: A mutation that results in the replacement of an amino acid with a similar amino acid.
Ex: Leu is replaced with Ile. Both these amino acids are non-polar and exhibit a similar structure.
So, a synonymous mutation changes the amino acid being coded. The protein function may not change as similar amino acid replaces the original amino acid.
40. Option C is correct.
According to Mayr, a biological species is actually or potentially interbreeding population.
41. Option A is correct.
Isomorphic = Similar in appearance
42. Diatoms contain silica in their cell wall
43. Endosymbiosis
44. Chlamydia
45. Salivary glands
46. H2SO4
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.