Answer:
1. sperm cells: cell has a flagellum for movement
2. smooth muscle: cells have an elongated shape (tapered at each end)
3. Squamous epithelium: cells are close together
4. Human red blood cells: cells are circular
5. Squamous epithelium cells are thin and flat, with irregular borders
6. Human red blood cells: cells are anucleate (without a nucleus)
7. smooth muscle: longest cell
Explanation:
- <em>Sperm cells</em>: Active and morphologically specialized cells. They characterize as having an elliptic head mostly occupied by the nucleus, and a tail of about 55 micrometers that moves impulsed by a motor dynein protein that uses ATP energy.
- Smooth muscle cells: Fusiform cells. Long and tapered at the extremes. Located in organs and viscera, and in vessel walls, where involuntary maintained slow contractions are needed. Although they are the longest cells, their length depends on the organ where they are located. They might reach up to 500 microns.
- Squamous epithelium cells: The wide and length of the cells supere their height. Some of them suffer a process of keratinization from being exposed to dehydration and touch.
- Red blood cells: Red blood cells or erythrocytes are biconcave disks-shaped, with no nucleus, and very small. These are flexible cells that might move along in the smallest capillaries. Hemoglobin provides the typical red color. The red blood cell size and number vary among species.
This should be Speciation.
Speciation is<span> the </span>evolutionary<span> process by which reproductively isolated biological populations evolve to become distinct </span><span>species.</span>
Answer:
a. individuals with type AB blood can only receive a transfusion of type AB blood
Explanation:
Type AB blood can receive transfusion from all the other blood types<em> (A, B, AB and O).</em> This is why, it is considered to be the <em>universal recipient.</em> Thus, <u>this makes choice a false</u>.
On the contrary, the universal donor among the blood types is <em>type O blood</em>. This means that a person with this type of blood can donate to all types of blood because it is compatible. However,<u> it can only receive transfusion from the same blood type O.</u>
Answer:
B
Explanation:
The rate of mutations on the S. Aureus population increased when exposed to antibiotics over time. This gave rise to a few mutants of the bacteria that could survive the methicillin antibiotic. This is because the mutation altered a protein target of methicilin (beta-lactam binding proteins) on which the antibiotic acted upon. These populations increased as the others were eliminated by the antibiotic – the way natural selection works. Over time, these mutations were transferred to other populations of bacteria by these MRSA through ‘sexual’ horizontal gene transfer, causing whole bacteria populations to be resistant against methicilin.
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