Answer:
Hypothesis.
Explanation:
The science mainly deals with the study of the nature and the natural phenomena. Different fields of science are chemistry, biology, physics, geology and maths.
Hypothesis may be defined as the complete explanation of the particular phenomena mainly on the observation of the individual. A scientific hypothesis can be converted into a theory if tested by the scientific experiments. Here, Edward Jenner based on his observation predicts the hypothesis about vaccination.
Thus, the correct answer is option (A).
Answer:
A. I will put cornstarch on one side and fine sand on the other side.
Explanation:
Pill bug are the creature with flat shells and extended legs. They move after analyzing their environment through their antenna. These antenna helps the pill bug to sense the environment and move towards the clean path. They move quickly with the help of their legs. These bugs are attracted towards cornstarch. If pill bugs are attracted to cornstarch they will towards cornstarch chamber instead of fine sand chamber.
Answer:
The presence of DNA
Explanation:
Prokaryotes have a DNA strand (chromosome which looks a bit like a shoe lace )
Eukaryotes have their DNA stored in a nucleus
:)
Answer:
- One spermatogonium produces 4 spermatids FALSE. One primary spermatocyte produces 4 spermatids.
Explanation:
Germ cells are diploid reproductive cells in charge of gamete production. Germ cells divide by mitosis and meiosis. Through mitosis, they originate more sexual cells, but through meiosis, they produce gametes -sperm and egg cells-. This process is known as gametogenesis.
Gametes´destiny is to merge during fecundation, and a new diploid cell called zygote emerges through fertilization. The zygote is a complete cell and suffers successive mitosis to form the new organism.
Spermatogenesis is the process of production and maturation of sperm cells. Spermatogonia are the masculine diploid germ cells, carrying 46 chromosomes. These germ cells suffer mitosis to reproduce. Some of them stay as spermatogonia, and some others become primary spermatocytes, which are in charge of gamete production. Primary spermatocytes are also diploid cells, meaning that they still carry 46 chromosomes.
Each primary spermatocyte replicates its genetic material and then goes through meiosis I to produce two daughter haploid cells called secondary spermatocytes, each of them carrying 23 chromosomes. Each secondary spermatocyte will produce two other haploid daughter cells by meiosis II.
The total result from the two cellular divisions of each primary spermatocyte is four haploid daughter cells called spermatids.
During spermiogenesis, spermatids mature into spermatozoa or sperm cells. Each sperm cell characterizes by being composed of a head, midpiece, and tail.
- DNA replicates once, but cells divide twice TRUE
- The products are spermatozoa that each have a head, midpiece, and tail TRUE
- Spermatids containing 23 chromosomes (1n) are produced TRUE
- One spermatogonium produces 4 spermatids FALSE. One primary spermatocyte produces 4 spermatids.
- Genetically diverse spermatids are created TRUE