1. Primary spermatocytes are formed directly from which cells?
A.
Spermatogonia
B.
Secondary spermatocytes
C.
Spermatids
D.
Spermatozoa
Correct Answer:
Spermatogonia
Explanation:
Primary spermatocytes develop from spermatogonia during spermatogenesis.
2. What type of cell division is undergone by a primary spermatocyte?
A.
Meiosis I
B.
Mitosis only
C.
Meiosis II only
D.
Binary fission
Correct Answer:
Meiosis I
Explanation:
A primary spermatocyte undergoes the first meiotic division, called meiosis I.
3. What is the chromosome number of a primary spermatocyte in humans?
A.
23
B.
46
C.
92
D.
44
Correct Answer:
46
Explanation:
A primary spermatocyte is diploid and contains 46 chromosomes in humans.
4. Which cells are produced when one primary spermatocyte completes meiosis I?
A.
Two secondary spermatocytes
B.
Two spermatids
C.
Four spermatozoa
D.
One spermatogonium
Correct Answer:
Two secondary spermatocytes
Explanation:
Meiosis I of one primary spermatocyte produces two haploid secondary spermatocytes.
5. Primary spermatocytes are usually larger than which of the following cells?
A.
Spermatids
B.
Secondary spermatocytes
C.
Sertoli cells
D.
Leydig cells
Correct Answer:
Secondary spermatocytes
Explanation:
Primary spermatocytes are generally larger cells that divide to form smaller secondary spermatocytes.
6. Before meiosis I, the DNA of a primary spermatocyte is duplicated during which phase?
A.
Interphase
B.
Cytokinesis
C.
Meiosis II
D.
Spermiation
Correct Answer:
Interphase
Explanation:
DNA replication occurs during interphase before the primary spermatocyte enters meiosis I.
7. A primary spermatocyte is best described as which type of cell?
A.
Diploid germ cell
B.
Haploid mature sperm cell
C.
Diploid supporting cell
D.
Haploid glandular cell
Correct Answer:
Diploid germ cell
Explanation:
Primary spermatocytes are diploid germ cells that participate in meiosis during sperm formation.
8. Which stage follows the primary spermatocyte stage in spermatogenesis?
A.
Secondary spermatocyte
B.
Spermatogonium
C.
Spermatozoon
D.
Sertoli cell
Correct Answer:
Secondary spermatocyte
Explanation:
After meiosis I, each primary spermatocyte forms secondary spermatocytes.
9. During meiosis I, homologous chromosomes of a primary spermatocyte are separated into which cells?
A.
Secondary spermatocytes
B.
Spermatids
C.
Spermatozoa
D.
Spermatogonia
Correct Answer:
Secondary spermatocytes
Explanation:
The first meiotic division separates homologous chromosomes and forms secondary spermatocytes.
10. The main role of a primary spermatocyte is to produce cells that will eventually develop into what?
A.
Spermatozoa
B.
Leydig cells
C.
Sertoli cells
D.
Primary oocytes
Correct Answer:
Spermatozoa
Explanation:
Primary spermatocytes begin the meiotic sequence that ultimately leads to the formation of spermatozoa.
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