All Free Biology MCQs with Answers
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19844 questions · page 683 of 1985
6821. Number of chromosomes in each cell of fruit fly, Drosophila melanogaster is:
- A. 46
- B. 26
- C. 48
- D. 8
Explanation: Drosophila have four pairs of chromosomes i.e. four homologous pairs of chromosomes in female Drosophila whereas three homologous pairs and one non homologous pair of chromosomes in male Drosophila.
Correct answer: 86822. In each cell of Garden pea, the number of chromosomes is:
- A. 26
- B. 16
- C. 08
- D. 14
Explanation: It is normal diploid number of chromosomes in garden pea.
Correct answer: 146823. Human sperms and eggs have:
- A. 23 chromosomes
- B. 46 chromosomes
- C. 4 chromosomes
- D. 13 chromosomes
Explanation: This is haploid number of human chromosomes as eggs and sperms are meiotic products.
Correct answer: 23 chromosomes6824. Number of chromosomes in pollens of onion is:
- A. 14
- B. 16
- C. 08
- D. 07
Explanation: Pollens or microspores are also haploid, formed by meiosis from a diploid microsporocyte or a pollen mother cell. The normal diploid number of chromosomes in onion is 16
Correct answer: 086825. Number chromosomes in the sperms of frog is:
- A. 26
- B. 13
- C. 14
- D. 16
Explanation: Normal diploid number of chromosomes in frog is 26.
Correct answer: 136826. The network of channels which is often continuous with plasma membrane and also appears to be in contact with the nuclear membrane is called as:
- A. Endoplasmic reticulum
- B. Chromatin network
- C. Reticular formation
- D. Microtubular network
Explanation: Endoplasmic reticulum is a source of communication between nucleus of a cell and its external environment.
Correct answer: Endoplasmic reticulum6827. Like intermediate filaments ........... also provides mechanical support to the cell so that its shape is maintained:
- A. Microfilaments
- B. Microtubules
- C. Golgi apparatus
- D. Endoplasmic reticulum
Explanation: Endoplasmic reticulum being a network present all around the nucleus upto cell membrane acts like spokes of a wheel to maintain the shape of the cell.
Correct answer: Endoplasmic reticulum6828. Two morphological forms of endoplasmic reticulum are:
- A. ER with the ribosome and ER without ribosome
- B. ER with cisternae and ER without cisternae
- C. ER with enzymes and ER without enzymes
- D. Rough endoplasmic reticulum and sarcoplasmic reticulum
Explanation: ER with ribosomes are called rough endoplasmic reticulum (RER) whereas ER without ribosomes is called smooth endoplasmic reticulum (SER). Sarcoplasmic reticulum is the SER of muscle cells.
Correct answer: ER with the ribosome and ER without ribosome6829. The apparatus, which was found virtually in all eukaryotic cells and consists of stacks of flattened membrane bound sacs is called as:
- A. Golgi Apparatus
- B. Granum
- C. Endoplasmic reticulum
- D. Intergranum
Explanation: A Golgi body is flattened membrane bound sac whereas a Golgi apparatus is a stack of Golgi bodies, whereas as Golgi complex is a Golgi apparatus along with transport vesicles of endoplasmic reticulum and Golgi vesicles
Correct answer: Golgi Apparatus6830. Inner concave surface of Golgi apparatus is:
- A. Maturation face
- B. Cis face
- C. Forming face
- D. Proximal face
Explanation: It is also called trans face being away from the endoplasmic reticulum. From this face transport vesicles of Golgi bodies are pinched off having finished products inside them. That is why it is called maturation face
Correct answer: Maturation face