Which ONE of the following refers to gradual change in the structure of organisms over time?
A - NSC Life Sciences - Question 1 - 2019 - Paper 2
Question 1
Which ONE of the following refers to gradual change in the structure of organisms over time?
A. National selection
B. Evolution
C. Speciation
Study the mechanisms ... show full transcript
Worked Solution & Example Answer:Which ONE of the following refers to gradual change in the structure of organisms over time?
A - NSC Life Sciences - Question 1 - 2019 - Paper 2
Step 1
Which ONE of the following refers to gradual change in the structure of organisms over time?
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Answer
The correct answer is B. Evolution. Evolution refers to the gradual process through which species undergo changes over time due to various factors such as natural selection and genetic drift.
Step 2
Which ONE of the following combinations represents reproductive isolation?
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Answer
The correct answer is A. (i) only. Species-specific courting behavior is essential for reproductive isolation, as it prevents interbreeding between different species.
Step 3
How many phosphate molecules would you expect in this sample?
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Answer
In a DNA sample, the number of adenine base pairs equals the number of thymine bases, and the number of guanine bases equals the number of cytosine bases. Since the sample has 60 guanine bases and 30 adenine bases, the answer is 90 phosphate molecules as each nucleotide consists of one phosphate group.
Step 4
Which ONE of the following represents this statement above?
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Answer
The correct answer is D. Biogeography. This concept explains how the geographic distribution of species supports the theory of evolution.
Step 5
One can conclude that the disorder is caused by a:
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Answer
The correct answer is A. Autosomal allele, with both parents heterozygous. The inheritance pattern suggests a recessive condition since it is observed in offspring with unaffected parents.
Step 6
What is the rate between the rate of extinction from 1900 to 1950 compared to the rate of extinction from 1950 to 2000?
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Answer
The correct answer is B. 4: 1. The extinction rate from 1900 to 1950 is significantly higher than from 1950 to 2000.
Step 7
Which ONE of the following combinations of effects will result if the hydrogen bonds are not strong?
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Answer
The correct answer is E. (i) and (iii) only. If hydrogen bonds are weak, DNA may not unwind properly nor maintain safe base pairing.
Step 8
Which ONE of the following best describes the mutation?
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Answer
The correct answer is B. A frame shift mutation. This type of mutation significantly alters the reading frame of the genetic code.
Step 9
What is the term that best describes this?
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Answer
The correct answer is D. Speciation. This term refers to the evolutionary process by which new biological species arise.
