BIOLOGY HIGH SCHOOL

Score: You may find _____ in your backyard, flying around or spinning a web. You may also find some of them on your dinner plate.
Porifera: sponges
Cnidaria: stingers
Mollusca: mollusks
Arthropoda: arthropods
Echinodermata: echinoderms

Answers

Answer 1
Answer: Arthropoda: arthropods. The other choices are marine organisms.

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According to erikson, development is best reflected in the relationship with a caregiver intelligence test scores mastery of specific cognitive skills resolution of psychosocial tasks

How many hormones does a girl have.

Answers

There is to many hormones to count actualy, I found information about 68 (or even more) hormones in human body, but probably many hormons still have to be discovered :)
There are too many hormones to claculate. Biologists find new hormones periodically.I have a biology book which has a list of hormones. According to that, there are 67 known at present.

Which of these valves prevents a backflow of blood into the left atrium?aortic valve

tricuspid valve

mitral valve

Answers

The answer would be the mitral valve. The mitral valve is the one responsible for preventing any backflow of the blood into the left atrium. The mitral valve functions between the left atrium and left ventricle, and it contains two tapered cusps.

Final answer:

The mitral valve prevents a backflow of blood into the left atrium. It closes when the heart contracts, preventing blood from flowing back. Other valves like the aortic and tricuspid have different functions.

Explanation:

The mitral valve, also known as the bicuspid valve, is the valve that prevents a backflow of blood into the left atrium. This valve is located between the left atrium and the left ventricle. When the heart contracts, the mitral valve closes, preventing blood from flowing back into the atrium. The other valves listed, the aortic valve and the tricuspid valve, have different functions. The aortic valve controls blood flow from the left ventricle into the aorta, and the tricuspid valve prevents backflow of blood into the right atrium.

Learn more about Mitral Valve here:

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Which of the following statements regarding a DNA double helix is true? The amount of adenine is equal to the amount of thymine, and the amount of guanine is equal to the amount of cytosine. The amount of adenine is equal to the amount of uracil, and the amount of guanine is equal to the amount of cytosine. The amount of adenine is equal to the amount of guanine, and the amount of thymine is equal to the amount of cytosine. The amount of adenine is equal to the amount of guanine, and the amount of uracil is equal to the amount of thymine. The amount of adenine is equal to the amount of cytosine, and the amount of guanine is equal to the amount of thymine.

Answers

Answer:

Option (1).

Explanation:

DNA (deoxyribo nucleic acid ) is the genetic material present in all the organisms except some viruses. DNA structure follows the Chargaff's rule.

Accoprding to Chargaff's rule, the ratio of purines to pyrimidines in a DNA molecule is equal to 1. The amount of guanine is nearly equal to the amount of cytosine whereas the amount of thymine is nearly equal to the amount of adenine.

Thus, the correct answer is option (1).

The combustion of glucose ultimately involves the transfer of electrons to oxygen (O2). In biological systems, this takes place without a large increase in temperature. Which of the following statements about this process in biological systems is true? 1) Coupled oxidation-reduction reactions occur with electrons being passed to intermediate electron carriers. 2) The process involves the transfer of 12 pairs of electrons to oxygen. 3) The transfer of electrons from intermediate electron carriers to molecular oxygen is catalyzed by the electron transport chain. 4) Though the process is a controlled oxidation, some energy is lost.

Answers

3) The transfer of electrons from intermediate electron carriers to molecular oxygen is catalyzed by the

The photosynthetic mechanism of the plants make it possible for them to have and create food in order to survive but as they make this "food" which is glucose, the by-product oxygen is created which hence is beneficial to all life forms of heterotrophs. 

When a fruit is being formed what type of vascular tissue transports the glucose into the fruit?

Answers

In times of rapid photosynthesis, the main product is glucose, but it is usually converted ... the sugar is being used (the sink) whether it is up or down the stem of the plant. ... This theory suggests that the sucrose is transported into the fruit by active.!

______are short and stout.
a. Endomorphs
b. Ectomorphs
c. Mesomorphs

Answers

Answer: A -endomorphs


Endomorphs usually have a shorter build and they gain fat very easily. Thus endomorphs are short and stout. They have very heavy arms. They have strong muscles in the upper leg.

Answer:

The correct answer is option A, Endomorphs

Explanation:

There are three body types in human beings and the characteristics features of all three body types is as follows:

1. Ectomorph - Skinny appearance, Small chest, joints,  bones and buttocks, Less body fat (without exercising), long limbs and Gains weight (build muscles) with difficulty

2. Mesomosph - Heavy body, Strong build, Gains muscles  and fat easily, have Athletic body of rectangular shape

3. Endomorph –  Soft  and round body, short limbs, Gains muscles  and fat easily

Thus considering the features of all three body types, it is clear that  Endomorphs are short and stout
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