NSC Life Sciences RNA and Protein Synthesis: Which ONE of the following refer

Question

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 below:
(i) Species specific courting behaviour
(ii) Interbreeding amongst different populations
(iii) Breeding at different times of the year

Which ONE of the following combinations represents reproductive isolation?

A. (i) only
B. (ii) and (iii) only
C. (i) and (ii) only
D. (i), (ii) and (iii)

A sample of DNA has 60 guanine bases and 30 adenine bases.

How many phosphate molecules would you expect in this sample?

A. 90
B. 60
C. 30
D. 120

The theory of evolution has been supported by a conservative study of the structure of vertebrate forelimbs from the fossil record.

Which ONE of the following signifies this statement above?

A. Genetic drift
B. Natural selection
C. Extinction
D. Biogeography

The table below concerns the rate of extinction of mammal species over different time periods.

| TIME PERIOD (YEARS) | RATE OF EXTINCTION (PER 100 YEARS) |
|---------------------|------------------------------------|
| 1900-1950           | 40                                 |
| 1950-2000           | 90                                 |

What is the ratio between the rate of extinction from 1950 to 1900 compared to the rate of extinction from 1900 to 2000?

A. 1:2
B. 1:3
C. 2:1
D. 3:1

Study the following effects:

(i) The double helix DNA will unwind during DNA replication
(ii) DNA can replicate itself into two strands
(iii) DNA has a specific structure which is double place

Which ONE of the following combinations of effects will result if the hydrogen bonds are too strong?

A. (i), (ii) and (iii)
B. (i) and (ii) only
C. (ii) and (iii) only
D. (i) only

The mutation...

A. Will result in an extra chromosome.
B. Will result in a protein if a different amino acid is coded for.
C. Will produce a different protein in a different amino acid is produced.
D. None of the above.

Which of the following best describes the mutations?

A. A gene may have multiple alleles.
B. A chromosome is a single strand of DNA.
C. Genetic mutations can alter protein synthesis.

Only one type of DNA can be used in the following stages (i) to (iv).  How many bases in this sequence would you expect to find?

A. 60
B. 30
C. 90
D. 120

An explanation describing evolution is presented in long evolutionary phases as follows:

(i) The permanent disappearance of a species from Earth
(ii) Genus to which Little Foot and Mrs. Ples belongs
(iii) The cell organelle to which mRNA attaches during protein synthesis
(iv) The position of a gene on a chromosome

The sugar that forms part of a nucleotide in RNA

A. Glucose
B. Dextrin
C. Ribose

The use of living organisms and their biological processes to improve the quality of human life.

A. Genetic Engineering
B. Biotechnology

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

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