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Xelga [282]
2 years ago
7

What is a sugar phosphate backbone and how many dose a double helix have?

Biology
1 answer:
Tema [17]2 years ago
7 0
A sugar phosphate backbone joins the nucleotide in a DNA sequence. A double helix has TWO backbones.
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kodGreya [7K]

Answer:

this may help

"The presence of hair, composed of the protein keratin, is one of the most obvious characteristics of mammals. Although it is not very extensive or obvious on some species (such as whales), hair has many important functions for most mammals. Mammals are endothermic, and hair traps a boundary layer of air close to the body, retaining heat generated by metabolic activity. Along with insulation, hair can serve as a sensory mechanism via specialized hairs called vibrissae, better known as whiskers. Vibrissae attach to nerves that transmit information about tactile vibration produced by sound sensation, which is particularly useful to nocturnal or burrowing mammals. Hair can also provide protective coloration or be part of social signaling, such as when an animal’s hair stands “on end” to warn enemies, or possibly to make the mammal “look bigger” to predators.

Unlike the skin of birds, the integument (skin) of mammals, includes a number of different types of secretory glands. Sebaceous glands produce a lipid mixture called sebum that is secreted onto the hair and skin, providing water resistance and lubrication for hair. Sebaceous glands are located over most of the body. Eccrine glands produce sweat, or perspiration, which is mainly composed of water, but also contains metabolic waste products, and sometimes compounds with antibiotic activity. In most mammals, eccrine glands are limited to certain areas of the body, and some mammals do not possess them at all. However, in primates, especially humans, sweat glands are located over most of the body surface and figure prominently in regulating the body temperature through evaporative cooling. Apocrine glands, or scent glands, secrete substances that are used for chemical communication, such as in skunks. Mammary glands produce milk that is used to feed newborns. In both monotremes and eutherians, both males and females possess mammary glands, while in marsupials, mammary glands have been found only in some opossums. Mammary glands likely are modified sebaceous or eccrine glands, but their evolutionary origin is not entirely clear.

The skeletal system of mammals possesses many unique features. The lower jaw of mammals consists of only one bone, the dentary, and the jaw hinge connects the dentary to the squamosal (flat) part of the temporal bone in the skull. The jaws of other vertebrates are composed of several bones, including the quadrate bone at the back of the skull and the articular bone at the back of the jaw, with the jaw connected between the quadrate and articular bones. In the ear of other vertebrates, vibrations are transmitted to the inner ear by a single bone, the stapes. In mammals, the quadrate and articular bones have moved into the middle ear ((Figure)). The malleus is derived from the articular bone, whereas the incus originated from the quadrate bone. This arrangement of jaw and ear bones aids in distinguishing fossil mammals from fossils of other synapsids.

Mammals, like birds, possess a four-chambered heart; however, the hearts of birds and mammals are an example of convergent evolution, since mammals clearly arose independently from different groups of tetrapod ancestors. Mammals also have a specialized group of cardiac cells (fibers) located in the walls of their right atrium called the sinoatrial node, or pacemaker, which determines the rate at which the heart beats. Mammalian erythrocytes (red blood cells) do not have nuclei, whereas the erythrocytes of other vertebrates are nucleated. "

Explanation:

7 0
3 years ago
Prior to the 1600s, it was believed that all living things were either plants or animals. Which of these inventions led to the d
AlexFokin [52]
The correct answer is the microscope
8 0
3 years ago
Read 2 more answers
Juana is a low-empathy person, whereas Fiorella is a high-empathy person. Research suggests that when shown photos of happy face
Zolol [24]

Fiorella is likely to smile slightly, while Juana is likely to hold a straight face.

<h3>What is Empathy?</h3>

This is defined as the capacity to understand or feel what another person is experiencing from within their frame of reference.

Low empathy involves inability to cope with emotional situations and are usually impatient which is why when shown photos of happy faces, they are more likely to hold a straight face.

Read more about Empathy here brainly.com/question/16253958

3 0
2 years ago
Put the steps of the carbon cycle in order using Step 1 as your starting point. Step 1: Carbon dioxide is
elena-14-01-66 [18.8K]
Answer

Step 1: taken in by plants during photosynthesis.

Step 2: The animal eats a plant and uses it carbohydrates for energy.

Step 3: The animal releases the carbon dioxide back into the atmosphere during respiration.

Step 4: The cycle repeats when the carbon stored in the atmosphere as carbon dioxide gas is taken in.



Hope this helps!
7 0
3 years ago
4. Analyze: Compare the offspring traits to the parent traits.
Oksana_A [137]

Answer: 4a. The transmission of characteristics from parents to offspring is called heredity, and the characteristics that are inherited can be predicted. 4b. An acquired characteristic is a non-heritable change in a function or structure of a living organism caused after birth by disease, injury, accident, deliberate modification, variation, repeated use, disuse, misuse, or other environmental influence. Acquired traits are synonymous with acquired characteristics.

Explanation:

8 0
3 years ago
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