31. Where does the fertilization of the egg take place with the sperm?
[A] Ovaries
[B] Fallopian tubes
[C] Uterus
[D] Vagina
Show Answer
Correct Answer: B [Fallopian tubes]
Notes:
The fertilization of the egg with the sperm occurs in the fallopian tube.
32. Syphilis is a bacterial infection usually spread by __
[A] Sexual contact
[B] Wound infection
[C] Air-borne droplets
[D] None of these
Show Answer
Correct Answer: A [Sexual contact]
Notes:
Syphilis is a bacterial infection mostly spread by sexual contact. It is caused by Treponema pallidum bacteria.
33. Which of the following species of Plasmodium don’t cause Malaria?
[A] Plasmodium piper
[B] Plasmodium vivax
[C] Plasmodium falciparum
[D] Plasmodium malaria
Show Answer
Correct Answer: A [Plasmodium piper]
Notes:
Plasmodium vivax, falciparum, and malariae species of Plasmodium cause Malaria. Whereas Plasmodium piper species of Plasmodium don’t cause Malaria.
34. Which of the following relationship was not studied by Mendel?
[A] Flower colour and seed colour
[B] Height and seed colour
[C] Flower colour and shape of pollen grain
[D] Height and seed coat colour
Show Answer
Correct Answer: C [Flower colour and shape of pollen grain]
Notes:
Flower colour and shape of pollen grain relationship was not studied by Mendel.
35. The number of sex chromosomes in the zygote of humans is __
[A] 2
[B] 1
[C] 3
[D] 4
Show Answer
Correct Answer: A [2]
Notes:
The number of sex chromosomes in the zygote of humans is 2.
36. Bacteria protect themselves from viruses by fragmenting viral DNA?
[A] Ligase
[B] Endonuclease
[C] Exonuclease
[D] Gyrase
Show Answer
Correct Answer: C [Exonuclease]
Notes:
Bacteria protect themselves from viruses by fragmenting viral DNA with Exonuclease. Enzymes that work by cleaving one nucleotide at a time from the end (Exo) of the polynucleotide chain are called exonucleases.
37. Which organism’s plasmid was first used to construct recombinant DNA?
[A] Cyanobacteria
[B] Bacillus subtilis
[C] Saccharomyces cerevisiae
[D] Salmonella typhimurium
Show Answer
Correct Answer: B [Bacillus subtilis]
Notes:
Bacillus subtilis organism’s plasmid was first used to construct recombinant DNA.
38. How many approaches are there in order to clone the complete genome?
[A] 1
[B] 2
[C] 3
[D] 4
Show Answer
Correct Answer: B [2]
Notes:
There are basically two approaches to cloning the entire genome. In the first approach, systematic cloning is performed and the second approach is based on randomly cloning overlapping fragments.
39. Which organ is the main digester and absorber of food?
[A] Colon
[B] Stomach
[C] Liver
[D] Small intestine
Show Answer
Correct Answer: D [Small intestine]
Notes:
The small intestine, the part of the gastrointestinal tract between the stomach and the large intestine, is the main digester and absorber of food. The small intestine has three distinct regions – the duodenum, jejunum, and ileum–that carry out the absorption of nutrients and minerals from food. It converts the food into a semi-solid mass.
40. In which one of the following is swim bladder absent?
[A] Cartilaginous fish
[B] Silverfish
[C] Cuttlefish
[D] Bony fish
Show Answer
Correct Answer: A [Cartilaginous fish]
Notes:
The swim bladder is an internal gas-filled organ that contributes to the ability of a fish to control its buoyancy, and thus to stay at the current water depth without having to waste energy in swimming. The cartilaginous fish (e.g. sharks and rays) split from the other fishes about 420 million years ago and lack both lungs and swim bladders, suggesting that these structures evolved after that split.
