11. Which vitamin is also called as riboflavin?
[A] Vitamin B1
[B] Vitamin B2
[C] Vitamin B3
[D] Vitamin B6
Show Answer
Correct Answer: B [Vitamin B2]
Notes:
Vitamin B2 is also called as riboflavin. Chemical formula of vitamin B2 is C17H20N4O6.
12. What does H denote in the popular term HIV ?
[A] Human
[B] Higher
[C] Hybrid
[D] NOTA
Show Answer
Correct Answer: A [Human]
Notes:
The Human Immunodeficiency Virus (HIV) are two species of lentivirus. It causes life-threatening disease of AIDS in humans and infects them. HIV is a sexually transmitted infection and occurs by contact with or transfer of blood, pre-ejaculate, semen, and vaginal fluids.
13. Which of the following branch of biology deals with the study and rearing of grasses?
[A] Agrostology
[B] Agronomy
[C] Dendrology
[D] Phenology
Show Answer
Correct Answer: A [Agrostology]
Notes:
Agrostology, the branch of botany concerned with the study of grasses, especially their taxonomy.
14. Which of the following vitamins was crystallized by Harry Holmes and Ruth Corbet?
[A] Vitamin A
[B] Vitamin B
[C] Vitamin C
[D] Vitamin E
Show Answer
Correct Answer: A [Vitamin A]
Notes:
Harry Holmes and Ruth Corbet isolated and crystallized vitamin A in 1937. Vitamin A is important for normal vision, the immune system, and reproduction.
15. In what form do fungi store food?
[A] Lipid
[B] Starch
[C] Oil and glycogen
[D] Protein
Show Answer
Correct Answer: C [Oil and glycogen]
Notes:
Oil and glycogen are stored in the fungus. Glycogen is a type of food that animals and fungi store.
16. What is the process in which material is ingested by the cells through the plasma membrane?
[A] Egestion
[B] Diffusion
[C] Osmosis
[D] Endocytosis
Show Answer
Correct Answer: D [Endocytosis]
Notes:
Endocytosis is the process in which the ingestion of material by the cells is carried out through the plasma membrane.
17. A segment of DNA consists of 120 adenine and 120 cytosine bases. What is the total number of nucleotides present in the segment?
[A] 120
[B] 240
[C] 345
[D] 480
Show Answer
Correct Answer: D [480]
Notes:
According to Chargaff’s laws, the amount of adenine is always equal to that of thymine, and the amount of guanine is always equal to that of cytosine, i.e. A = T(120) and G = C (120), hence, the total no. The number of nucleotides would be 120 x 4 = 480.
18. What kind of sugar is present in sugarcane?
[A] Sucrose
[B] Hexose
[C] Glucose
[D] Ribose
Show Answer
Correct Answer: A [Sucrose]
Notes:
Sucrose is present in sugarcane. It is also known as cane sugar or table sugar. It is the combination of glucose and fructose.
19. When is reverse transcriptase a useful enzyme?
[A] an RNA virus converts its RNA to DNA
[B] there are no host cells present
[C] nutrients are scarce
[D] spikes are forming in the new virus
Show Answer
Correct Answer: A [an RNA virus converts its RNA to DNA]
Notes:
Reverse transcriptase is a useful enzyme to have when an RNA virus converts its RNA to DNA. Reverse transcriptase converts RNA sequences into cDNA sequences that are capable of being inserted into different regions of the genome.
20. What is the most popular indirect method of counting virus particles?
[A] hemagglutination assay
[B] plaque-assay
[C] counting plaque-forming units
[D] colony counting
Show Answer
Correct Answer: A [hemagglutination assay]
Notes:
The hemagglutination assay (HA) is a tool used to detect hemagglutinating agents in cell culture isolates or amnioallantoic fluids.
