"Double fertilization involves two sperm cells; one fertilizes the egg cell to form the zygote, while the other fuses with the two polar nuclei that form the endosperm."
Enzymes are a type of protein that aid in which of the following processes?
- cellular signaling and regulation
- transport across the cell membrane
- the breakdown of food molecules
- all of these
I think you forgot the answer choices. Is this your question?
If so, it is <u>D) all of these. </u>Enzymes aid in all kinds of microbiological processes, including cellular signalization, regulation and transportation - in addition to the breakdown of nutrients.
Answer:
1) the genes and chromosomes do not double after each generations because parental sex cells are haploid and only contain one set of chromosomes. During fertilization the two cells fuse to form a diploid zygote with two copies of genes and chromosomes. For example a normal human has 46 chromosomes (2 copies of 23 chromosomes) during reproduction gametes which contain 23 chromosomes (haploid) fuse to form an offspring with the correct number of chromosomes ( 23 + 23 = 46).
2) offspring only receive one set of chromosomes from each parent so to maintain the chromosome number of humans. If this did not happen you would not be the same species.
We can use the formula for orbital time period:
T² = (4π²/GM)a³; where T is in Earth years, a is distance from sun in AU, M is the solar mass (1 for the sun), G is the gravitational constant.
In the given units, 4π²/G = 1
T² = 0.66³
T = 0.536 Earth years = 195.71 Earth days
I am pretty sure it is animal cells and plant cells considering I learned that last year in 6th grade
