Answer:
The correct option is d) head.
Explanation:
Bicoid protein works as a transcription factor. It enters the nuclei of the embryos in early segmentation, where it activates the hunchback gene. In Drosophila, embryonic development begins at the time of fertilization. The sperm enters the mature oocyte through the micropile, a structure located in what will be the anterior region of the egg. Bicoid and hunchback mRNAs, protein products are critical for the formation of the head and thorax. Already in the early stages of oocyte development, certain mRNAs are located in specific regions of the oocyte: mRNA molecules encoding the Bicoid protein are preferentially located in the anterior region of the oocyte. Moderate levels of the bicoid protein are necessary to activate the formation of the thorax (i.e., the expression of the hunchback gene) but the formation of the head requires high concentrations of Bicoid, the promoters of a specific gap gene of the head must have sites of low affinity binding for Bicoid, so that this gene can be activated only in extremely high concentrations of Bicoid.
The lack of Bicoid protein affects the formation of the head and other structures in the anterior region of the oocyte.
Answer:
A. passive transport by diffusion
Explanation:
Diffusion and osmosis are both types of passive transport. They do not require energy. Diffusion is the general term for the process. Osmosis is the diffusion of water molecules.
Many small, uncharged molecules can cross the cell membrane by diffusion. Oxygen and carbon dioxide are examples of two small molecules that pass the cell membrane by passive transport.
Larger or charged molecules require energy to cross the cell membrane. This is achieved by active transport.
No. all lipids r semi-solid, like room temp. butter..
<h2>Answer ⚘</h2>
❝ Acceptable Macronutrient Distribution Ranges (AMDRs) recommend that <u>Carbohydrates</u> should provide more calories than either proteins or fats. ❞
<h3>#CarryOnLearning</h3>
WatanabeHaruto⚘
The answer is <span>C. reductions of chromosome number.
Meiosis is also known as a reduction division of the cells. The reason for that is because during meiosis the diploid cells are divided into haploid cells. Meiosis consists of two divisions - meiosis I and meiosis II. In meiosis I, the number of chromosomes is reduced, while meiosis II is similar to mitosis. In both meiosis and mitosis, however, cell division, duplication of chromosomes, and production of new cells are common processes.</span>
