Question

QUESTION 22

1. Veins, arteries and capillaries are all sites where exchange between the blood and tissues can take place. s in:

   		True
   		False

QUESTION 23

1. When two species are not closely related and hence are anatomically different undergo convergent evolution, they evolve similar characteristics because they live in the same habitat.

   		True
   		False

QUESTION 24

1. A nucleotide that is comprised of the sugar ribose, a phosphate molecule, and the base uracil would be classified as:

   		DNA
   		RNA
   		either DNA or RNA
   		neither DNA or RNA

QUESTION 25

1. tRNA brings nucleotides to the strand of DNA that is being replicated.

   True

   False

QUESTION 26

1. Which of the following are true statements?

   		tRNA carries amino acids
   		t RNA is where an anti-codon would be found
   		both A and B are true
   		neither A or B are true

QUESTION 27

1. While both active and facilitated transport use proteins to carry molecules across the cell membrane, only active transport requires energy to carry molecules across the cell membrane.

   		True
   		False

QUESTION 28

1. Three mRNA nucleotides determine which amino acid is to be added to a protein that is being synthesized.

   		True
   		False

QUESTION 29

1. Because a cell membrane is selectively (semi) permeable, the cell membrane will allow some but not all molecules to pass through it.

   True

   False

QUESTION 30

1. As the radius of a spherical cell increases, the volume of the cell and the surface area of the cell membrane increase at the same rate.

   True

   False  

QUESTION 31

1. One codon will determine which amino acid will be added to a protein being synthesized during protein synthesis.

   		TRUE
   		FALSE
   		3

Answer 1

22. False

Exchange of nutrients, waste and oxygen takes place at capillaries. From heart blood taken away by arteries and veins carry the blood back to the heart.

23. True

In convergent evolution different species evolve similar features because they live in same habitat/environment. When different species live in same environment, they develpo analogous features.

24. RNA

RNA is made up of ribose sugar, phosphate, and bases adenine, guanine, cytosine and uracil whereas DNA has deoxyribose sugar, phosphate and bases adenine, guanine, cytosine and thymine.

25. False

tRNA participates in translation not in replication it carries amino acid to the ribosome during translation process.

26. Both A and B are true

tRNA carries amino acids to the ribosome during protein synthesis and having an anti-codon where codon binds.  

27. True

Only active transport requires energy, facilitated transport is a mode of  passive transport.

28. True

Codon is madeup of three nucleotides and codons specify that which amino acid will add to the growing polypeptide chain during translation.

29. True

Cell membrane is selectively permeable and allow only certain moecules across it.

30. False

As the radius of a spherical cell increases, rate of increase of volume of the cell is more than the surface area of the cell membrane.

31. True

Codon specify that which amino acid will add to the growing polypeptide chain during translation. There are 64 codons, 61 are coding and 3 are stop codons i.e., UAA, UAG and UAG. AUG is start codon and specify methionine.