Biology Answers

How are antibiotic-resistance cassettes acquired by integrons? Once acquired, can they be lost?

Which of the following statements are correct?

a) The lipid composition of the supercapsid envelope of the virus corresponds to the composition of the host cell,

b) The viral envelope is formed in the process of budding through the membrane of the host cell,

c) The budding of viruses can occur through the cellular,

Nuclear or cytoplasmic membrane of the host cell,

d) All viruses contain a supercapsid shell,

e) All viruses have the shape of an icosahedron. Choose the only combination that takes into account all the correct answers:

A, c, d

A, b, c

A, b, c, d, e

O a, d, e,

B,d, e

The structure of the influenza virus virion:

Supercapsid shell,

b) protein capsid,

c) single-stranded +RNA, fragmented,

d) single-stranded -RNA, fragmented, e) single-stranded RNA, circular.

why are derived characteristics more useful in establishing evolutionary relationship than are shared characteristics? Use two groups of mammals to illustrate your answer. For example, compare horses ( order perissodactyla ) and camels ( order artiodactyla)

describe hypothetical synapomorphies that would result in an assemblage of one order and two families

Name five possible ways whereby infected tissue may be modified to limit the spread of pathogen

List and indicate the functions of the major regions of the cerebral hemispheres, diencephalon, brain stem and cerebellum. (20%- 5 marks for each region).

List and indicate the functions of the major regions of the cerebral hemispheres, diencephalon, brain stem and cerebellum. (20%- 5 marks for each region).

Provide a brief explanatory note to distinguish between planaria reproduction, regeneration and feeding

Make schematic drawings of the life cycles of Obelia or Aurelia or Metridium

Describe the three other protizoans locomotion