11. A protein that binds to operators or stoperators within prophage to prevent transcription of lytic genes is called__?
[A] immunity repressor
[B] immunity operon
[C] operon repressor
[D] None of these
Show Answer
Correct Answer: A [immunity repressor]
Notes:
A protein that binds to operators or stoperators within prophage to prevent transcription of lytic genes is called immunity repressor.
12. Which of the following is true about the cell wall of Gram-positive bacteria?
[A] It consists of multiple layers
[B] It is thicker than that associated with gram-negative bacteria
[C] It contains teichoic acids
[D] All of these
Show Answer
Correct Answer: D [All of these]
Notes:
The cell wall of Gram-positive bacteria are: consists of multiple layers, thicker than that associated with gram-negative bacteria and contains teichoic acids.
13. What is the fusion of mature individuals that directly act as gametes called?
[A] Isogamy
[B] Anisogamy
[C] Hologamy
[D] Autogamy
Show Answer
Correct Answer: C [Hologamy]
Notes:
In Chlamydomonas, two mature individuals participate in sexual reproduction called hologamy.
14. Fruits are not found in gymnosperm plants because__?
[A] They are seedless plants
[B] They are not pollinated
[C] They have no ovary
[D] Process of fertilization does not take place in them
Show Answer
Correct Answer: C [They have no ovary]
Notes:
Fruits are not found in gymnosperm plants because they have no ovaries. Gymnosperms belong to the Kingdom Plantae and the sub-kingdom Embryophyta.
15. Gymnosperms are called naked seed plants because of the lack of which of the following?
[A] Cotyledon
[B] Endosperm
[C] Ovary Wall
[D] Testa
Show Answer
Correct Answer: C [Ovary Wall]
Notes:
Gymnosperms are called naked seed plants because of the lack of Ovary Wall.
16. Which plant tissue can be classified into sclerenchyma, collenchyma and parenchyma?
[A] Complex Permanent Tissue
[B] Simple Permanent Tissue
[C] Intercalary meristem
[D] Epidermis
Show Answer
Correct Answer: B [Simple Permanent Tissue]
Notes:
Simple Permanent Tissue can be classified into sclerenchyma, collenchyma, and parenchyma.
17. What is the cork cambium, cork cell, and phelloderm collectively called?
[A] periderm
[B] lenticels
[C] abscission
[D] cytokinin
Show Answer
Correct Answer: A [periderm]
Notes:
The cork cambium, cork cell and phylloderm are collectively called the periderm. The periderm substitutes for the epidermis in mature plants.
18. What does a plant need to survive?
[A] sunshine
[B] nutrients
[C] water
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
A plant needs sunshine, nutrients, and water to survive. Plants provide food, medicine, shelter, and the oxygen we need to breathe.
19. Which of the following are extinct body fishes?
[A] Chondrichthyes
[B] Osteichthyes
[C] Placoderms
[D] Acanthodians
Show Answer
Correct Answer: D [Acanthodians]
Notes:
Anthody or Acanthodion is an extinct class of gnathostomes, usually considered a paraphyletic group.
20. Kangaroo is a member of which order?
[A] Monotremata
[B] Marsupialia
[C] Prototheria
[D] Insectivora
Show Answer
Correct Answer: B [Marsupialia]
Notes:
Kangaroo is a mammal with a pouch. It is related to Marsupialia. Prototheria and Monotremata are primitive mammals.
