Biology problems
- 1. Which of the following is true of kinetochores?
Options- A. They are the primary centrosome structures that maintain the attachment of the sister chromatids prior to mitosis.
- B. They are the sites at which microtubules attach to chromosomes.
- C. They are located at the center of the centrosome and organize tubulin into spindle fibers.
- D. They cross at the cell's equator and move against each other, causing the cell to elongate. Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: They are the sites at which microtubules attach to chromosomes.
Explanation:
They are the sites at which microtubules attach to chromosomes.
- 2. Which one of the following is true of tRNAs?
Options- A. tRNAs are double-stranded.
- B. There are four types of tRNA.
- C. Each tRNA binds a particular amino acid.
- D. All of the above Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: Each tRNA binds a particular amino acid.
Explanation:
tRNA abbreviated as A transfer RNA is an adaptor molecule composed of RNA, typically 76 to 90 nucleotides in length, that serves as the physical link between the mRNA and the amino acid sequence of proteins.
- 3. Non-Gonococcal Urethritis is most often caused by
Options- A. chlamydia
- B. gonorrhea
- C. progesterone
- D. herpes genitalis Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
Correct Answer: chlamydia
Explanation:
Chlamydial infection is very common in both males and females.
NGU (Non-Gonococcal Urethritis) is an infection of the urethra caused by pathogens (germs) other than gonorrhea.
Several types of germs cause NGU. The most common and serious is chlamydia.
- 4. The schwann cell forms a myelin sheath around the
Options- A. nodes of Ranvier
- B. dendrites
- C. nucleus
- D. axon Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: axon
Explanation:
Schwann cells or neurolemmocytes are the cells in the peripheral nervous system that form the myelin sheath around a neuron's axon.
- 5. Major fructose sources include
Options- A. Fruit juices
- B. Corn syrup
- C. Honey
- D. All of the above Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: All of the above
Explanation:
Major fructose sources include all fruits and honey.
- 6. In recombinant DNA methods, the term vector can refer to
Options- A. the sticky end of a DNA fragment
- B. a plasmid used to transfer DNA into a living cell
- C. a DNA probe used to identify a particular gene
- D. the enzyme that cuts DNA into restriction fragments Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
Correct Answer: a plasmid used to transfer DNA into a living cell
Explanation:
The term 'Vector' in recombinant DNA methods, refers to a plasmid or other agent used to transfer DNA into a living cell.
- 7. Which of the following defines a genome?
Options- A. Every human cell
- B. the complete set of an organism's genes and other DNA sequences
- C. the complete set of an organism's polypeptides
- D. a karyotype Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO, IT Trainer
Correct Answer: the complete set of an organism's genes and other DNA sequences
- 8. Which chemical is not found in DNA nucleotides?
Options- A. Thymine
- B. Uracil
- C. Adenine
- D. All of the above Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
Correct Answer: Uracil
Explanation:
A nucleotide is an organic molecule that is the building block of DNA and RNA. They also have functions related to cell signaling, metabolism, and enzyme reactions. A nucleotide is made up of three parts: a phosphate group, a 5-carbon sugar, and a nitrogenous base. The four nitrogenous bases in DNA are adenine, cytosine, guanine, and thymine. RNA contains uracil, instead of thymine.
A nucleotide within a chain makes up the genetic material of all known living things.
- 9. During the process of protein synthesis, each trna carries one
Options- A. amino acid
- B. nucleotide
- C. fatty acid
- D. nucleic acis Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
Correct Answer: amino acid
Explanation:
During protein synthesis process, each tRNA carries one aminoacid for protein synthesis to the ribosomes.
- 10. Which best describes a gene?
Options- A. a segment of chromosomal DNA
- B. tightly coiled strands of DNA
- C. different allele forms of a trait
- D. None of the above Also asked in: AIEEE, Bank Exams, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: a segment of chromosomal DNA
Explanation:
Gene is a hereditary unit consisting of a sequence of DNA that occupies a specific location on a chromosome and determines a particular characteristic in an organism.
In short it is a piece or segment of chromosome.
Genes undergo mutation when their DNA sequence changes.
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