False
Sperm receptor is also known
as zona pellucida sperm –binding protein 3 (ZP-3). It is a ZP module protein in human
that encode by the ZP3 gene. Thus, ZP3 is the receptor that is found in the
zona pellucida that binds the sperm at the <span>beginning</span><span> of fertilization.</span>
The Golgi apparatus is the only organelle that produces, modifies, packages, and then delivers a product throughout the cell.
You have already worked out that the white flower must have genotype pp (two recessive white alleles) and that the purple flower could be homozygous (PP) or heterozygous (Pp).
<span>Now you need to draw Punnet squares for both possibilities and show that the way to determine the genotype is the proportion of purple offspring. If the genotype is PP, then all the progeny will inherit one P and one p, making 100% purple flowers. If the purple flower is Pp, then half will inherit P and half will inherit p, making for half white and half purple flowers in the next generation.</span>
Less growth hormones and a lower metabolic rate
<span>Arrange the following five events in an order that explains the mass flow of materials in the phloem.
1. Water diffuses into the sieve tubes.
2. Leaf cells produce sugar by photosynthesis.
3. Solutes are actively transported into sieve tubes.
4. Sugar is transported from cell to cell in the leaf.
5. Sugar moves down the stem.
</span>
C) 2, 4, 3, 1, 5
