11. Microfilaments are made up of which protein?
[A] Tubulin
[B] Actin
[C] Myosin
[D] Chitin
Show Answer
Correct Answer: B [Actin]
Notes:
Microfilaments are composed of globular subunits of the protein actin. Actin monomers polymerize in the presence of ATP to form flexible helical filaments.
12. Which one of the following is an example of a phospholipid?
[A] Steroid
[B] Cholesterol
[C] Lecithin
[D] Sterol
Show Answer
Correct Answer: C [Lecithin]
Notes:
Lecithin is a mixture of brown and yellow colored phospholipids that contain glycerol. It also acts as an emulsifier in many types of food.
13. Angiosperms are the main plant because__?
[A] Domestication by man
[B] Power of adapting in diverse habitats
[C] Self-pollination property
[D] Property of producing a large number of seeds
Show Answer
Correct Answer: B [Power of adapting in diverse habitats]
Notes:
Angiosperms are plants that produce flowers. They hold their seeds in the fruits. They are the largest and most diverse group within the Plantae kingdom, with approximately 300,000 species.
14. Which of the following is the final step in the synthesis of peptidoglycan?
[A] attachment of a peptide to muramic acid
[B] attaching two amino acids to form a cross-link
[C] attachment of a portion of peptidoglycan to a membrane lipid
[D] binding of penicillin to a membrane protein
Show Answer
Correct Answer: B [attaching two amino acids to form a cross-link]
Notes:
Peptidoglycan or murein is a type of polymer consisting of sugars and amino acids. Attaching two amino acids to form a cross-link is the final step in the synthesis of peptidoglycan.
15. The resin duct of a gymnospermous stem is an example of__?
[A] Big vacuole
[B] Lysigenous cavity
[C] Intercellular space
[D] Schizogenous cavity
Show Answer
Correct Answer: D [Schizogenous cavity]
Notes:
Schizogenous cavities are formed by the separation of glandular cell initials, resulting in a space lined by secretory epithelial cells.
16. What does the lateral meristem provide to the plant?
[A] length of the plant
[B] thickness of the plant
[C] size of the internode
[D] strength to the plant
Show Answer
Correct Answer: B [thickness of the plant]
Notes:
Lateral meristem upsurges the thickness of the plant. It is existent in the radial portion of the stem or root.
17. Which of the following stimulates by gibberellin hormone?
[A] shoot elongation
[B] seed germination
[C] fruit and flower maturation
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Gibberellins hormones stimulate shoot elongation, seed germination, and fruit and flower maturation.
18. What is known as the exclusion of plant diseases by legislation?
[A] Disease resistance
[B] Plant quarantine
[C] Biological control of plant
[D] Cultural control
Show Answer
Correct Answer: B [Plant quarantine]
Notes:
Plant quarantine is defined as the legal enforcement of those measures. These are intended to prevent the spread of pests or to prevent further spread if they have already gained entry and are established in newly restricted areas.
19. Phylum Annelida is not characterized by__
[A] segmentation
[B] closed circulatory system
[C] ventral nerve chord
[D] pseudocoelom
Show Answer
Correct Answer: D [pseudocoelom]
Notes:
Pseudocoelom is found in animals belonging to the phylum Nematoda or Aschelminthes. The pseudocoelom is a fluid-filled body hole that extends inside the outer body wall of the nematode.
20. Which of the following is a correct feature of a frog?
[A] jaws but no teeth
[B] eyes but no lids
[C] ears but no pinnae
[D] hands but no fingers
Show Answer
Correct Answer: C [ears but no pinnae]
Notes:
Frogs have eyes and they have 3 eyelids. The pinnae are the visible part of the ear that resides on the outside of the head, although they do have a middle ear called the tympanic cavity and an inner ear.
