BIOLOGY HIGH SCHOOL

Attractants and repellents are detected by chemoreceptors that can trigger a. different flagella to rotate to change direction toward or away from the source of the attractants or repellents. b. the rotary flagella to change their rotation to allow the bacterium to change direction randomly. c. the flagella to whip in unison. d. different flagella to stop or start to allow cell movement.

Answers

Answer 1
Answer:

Answer:

b. the rotary flagella to change their rotation to allow the bacterium to change direction randomly

Explanation:

The bacterial flagella are made up of flagellin protein. The bacterial flagella is divided into three parts hook, filaments, and the basal body. Rotor is present in bacterial flagella which extends to the cytoplasm and makes C ring.  

C ring contains several switch proteins that change the rotation of the flagella instantly in response to repellent or attractant which allows to change the direction of bacteria randomly. Bacterial Flagella can move clockwise and counterclockwise. Therefore the right answer is B.

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

Epithelial cells grow close together to form the body's .

Answers

The answer is skin.

There are four basic types of animal tissue - epithelium, connective, nervous, and muscle tissue. Epithelial cells form epithelium which covers surfaces of blood vessels and organs in the body. All glands are, as well, made of epithelial cells. Also, epithelial cells grow close together to form the body's skin. 

Higher animals and plants most likely have _____.isogametes
anisogametes
oogametes

Answers

oogamates

oogamates is known to be a large non- motile gametes that contain a reserve material which is being used by the developing zygote that is formed when the sperm fuses with such gametes. Thus, gametes can be defined as a set of dissimilar chromosomes formed through mitosis.

Answer is Oogametes


hope it helps

Darwin wrote many of the premises of 'The Theory of Evolution by Natural Selection' by noting differences in the _________ of closely related ______________, while studying in the Galapagos Islands. A) feet, finches. B) beaks, finches. C) feather color, tortoises. D) dietary preferences, tortoises.

Answers

The correct answer is B. beaks, finches

Explanation:

One of the main elements Darwin used to write "The Theory of Evolution by Natural Selection" was his observation of finches on the Galapagos island. Charles Darwin visited Galapagos during the 1830s and in there he observed multiple species of finches that differ in the shape of their beaks. This caught Darwin's attention who determined the shape of the beak varied according to the diet the species had. For Darwin, this shown all the finches derived from the same ancestor and their beaks and other features were the results of natural selection and evolution. Thus, Darwin wrote his theory by noting the differences in the beaks of closely related finches.
the answer to the question is B because he studied the finches for the fact that they lived on different islands and because of that the birds evolved their beaks to survive in their environment hope this helps

Water has the ability to dissolve salts and carry dissolved carbon dioxide. How does this action help the human body maintain homeostasis?A: the body will be able to absorb materials it needs form the environment
B: Both are involved in providing energy to the cells.
C: Waste can be removed from the cells of the body.
D: These materials can be cycled through the body.

Answers

Answer:

answer C.

Explanation:

waste can be removed from the cells of the body.

Which cell structure directs the cell activities

Answers

The nucleus -- it is the powerhouse of the cell!

Answer:

meb is right  give him stars plz im saying this so no one can give you the worng Answer

Which of the following do Archaea and Bacteria have in common?They both use a special form of RNA polymerase to transcribe their DNA.

They both are commonly found on human skin.

They both make chitin in order to reinforce their cell membranes.

They both keep their DNA in the form of a nucleoid.

Answers

Out of all of the choices to be made, the Archaea and bacteria both can keep their DNA in the form of a nucleoid in common. 
they both keep their DNA in the form of a neucleoid
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