BIOLOGY MIDDLE SCHOOL

What is a organelle

Answers

Answer 1
Answer: An organelle is a functional subunit enclosed by a membrane within a eukaryotic cell. The name "organelle" means little organ and the name comes from the analogy with organs: what an organ is to a body, an organelle is to a cell. So, the organelle is the organ of the cell. There are different types of organelles in cells, such as nucleus, mitochondria, Golgi apparatus, endoplasmic reticulum, chloroplasts, vacuoles, and they all have a different function. For example, the nucleus is the organelle which main function is control of cell activities. Mitochondria are organelles which main function is energy production.

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How was the brushtail possum transported to its new ecosystem?

Answers

The common brushtail possum was introduced to New Zealand in 1837 to establish a fur industry, but in the mild subtropical climate of New Zealand, and with few to no natural predators, it thrived to the extent that it became a major agricultural and conservation pest.

Which is not true of Meiosis?A. Meiosis starts with half the number of chromosome as Mitosis

B. The genetic offspring are exactly like the parent cell.

C. There are 23 chromosomes from each parent cell passed on to the offspring.

D. Meiosis goes through 2 stages of division, Meiosis I and II.

Answers

Answer:

I would say it is B.

Explanation:

In Meiosis, specifically in Prophase 1, it creates genetic variation. Crossing over occurs in that stage

Water makes up about__percent of the human body.

80
60
90
70

Answers

Answer: 60

it makes up about 60-65%

Explanation:

Answer:

60

Explanation:

Biomes are large regions characterized by certain conditions, including a range of climate and ecological communities adapted to those conditions. Ecosystems consist of all interactions between biotic and abiotic factors functioning together in an area. How are ecosystems and biomes related? A. Biomes and ecosystems are identical in size and composition.
B. A biome includes many similar ecosystems.
C. Organisms found in ecosystems cannot be found in biomes.
D. An ecosystem includes many different biomes.

Answers

The answer is A. A biome includes many similar ecosystems

Cells in the human eye send nerve impulses to the brain that cause the pupil to constrict. This is an example of a reaction to what kind of stimuli?chemicals

light

touch

sound

Answers

Cells in the human eye send nerve impulses to the brain that causes the pupil to constrict. This is an example of a reaction to the light stimuli. Thus, the correct option is B.

What stimuli control reaction of pupil?

Pupils are the part of eye which respond to three distinct kinds of stimuli which include their constriction in response to brightness of light, this is called as the pupil light response, constrict in response to near fixation which is known as the pupil near response, and dilate in response to increases in the arousal and mental efforts, either these are triggered by an external stimulus or occur spontaneously.

Light is the stimulus and the impulses in response to this reach the brain through the optic nerve and the response due to this is conveyed to the pupillary musculature through autonomic nerves which supply the eye.

Therefore, the correct option is B.

Learn more about Pupil reaction here:

brainly.com/question/28189314

#SPJ2
this is a reaction to light.

Which of the following monomers would be used to make the double helix of a DNA molecule?0-
N
Base)
0=P-0— Сн, о
Sugar
0-
н но
Он — N— С– С— ОН
I—0-х
сн, он
с
о
н
н
н
с
НО
н
ОН
с
ОН
с

Answers

Answer:

A monomer made up of a nitrogenous base, a five-carbon sugar, and a phosphate group bonded together.
a nitrogenous base, phosphate group, 5 carbon sugar
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