Question

QUESTION 47

1. The best example of artificial selection is:

		a. Development of the Honey Crisp apple
		b. Rats evolving tolerance of humans
		c. Falcons moving into cities to eat pigeons
		d. Seabirds eating plastic

2 points   

QUESTION 48

1. Which is NOT true of prions?

		a. They are proteins
		b. They contain no genetic material
		c. They can be killed by cooking
		d. They primarily affect the brain

2 points   

QUESTION 49

1. An example of a genotype would be:

		a. Having sickle-cell anemia
		b. Freckles and red hair
		c. Pea plant with white flowers
		d. Being heterozygous for red-green color blindness

2 points   

QUESTION 50

1. When CO2 is dissolved in pure water, it forms H2CO3. This molecule increases the concentration of hydrogen ions in the solution, making the solution:

		a. Basic
		b. Alkaline
		c. Acidic
		d. Neutral

2 points   

QUESTION 51

1. All viruses have a protein capsid, but not all viruses have:

		a. Surface proteins
		b. A membranous envelope
		c. A genome
		d. The ability to bind to cells

2 points   

QUESTION 52

1. What are a pair of homologous chromosomes?

		a. Same sequence of genes, but not identical
		b. Identical DNA strands
		c. Complementary DNA strands
		d. Sister chromatids connected at the centromere

2 points   

QUESTION 53

1. Which single molecule has the largest molecular weight?

		a. Water (H2O)
		b. ATP
		c. Glucose
		d. tRNA

2 points   

QUESTION 54

1. Which are the properties of a proton?

		a. Mass of 1, charge of +1
		b. Mass of 0, charge of +1
		c. Mass of 0, charge of 0
		d. Mass of 1, charge of -1

2 points   

QUESTION 55

1. Long chains of amino acids are:

		a. Polypeptides
		b. DNA or RNA
		c. Polysaccharides
		d. Phospholipids

Answer 1

48. (C) Prions withstand digestion by protein-cleaning enzymes, can remain infectious for years when they are fixed by drying or chemicals, can survive 200 ° C heat for 1-2 hours, and can be glued to stainless steel within minutes

50. (C) The increase in H+ leads to a decrease in pH (that is, the blood becomes more acidic).

51. (B) Not all viruses have envelopes. Usually the envelopes are produced from parts of the host cell membranes (phospholipids and proteins), but include certain viral glycoproteins.

55. (A) polypeptide is an amino acid chain. The amino acids bond with peptide groups to create a polypeptide. The n-terminal (amino terminal) is situated at one end of the polypeptide and at the other end of the c-terminal (carboxyl terminal).