The cell membrane of a red blood cell will allow water, oxygen, carbon dioxide, and glucose to pass through. Since other substances are blocked from coming in, this membrane is called A. perforated. B. semi-permeable. C. non-conductive. D. permeable.

Answers

Answer 1

Answer:

The correct answer would be B. semi-permeable.

Plasma membrane of any cell including red blood cell is semi-permeable in nature as it is made up of lipid bilayer.

It permits the passage of certain substances across the membrane while it blocks other substances.

Gases, small uncharged or non-polar substances such as oxygen, carbon dioxide, et cetera can easily pass through the cell membrane of a cell.

Large or charged molecules such as proteins, sodium ions, potassium ions et cetera can not pass through the cell membrane. They require carrier proteins to pass through the membrane.

Answer 2

Answer: Because only certain things are allowed to pass through, this would be considered semi-permeable. B.

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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).

Describe an example of the cognitive stage, the associative stage, and the autonomous stage during learning the task of operating your new video camera.

Answers

I don't understand this but can u please help me with history

What is an explanation of why producers are always found at the lowest trophic level? A) Producers are larger than consumers. B) Consumers are eaten by a variety of producers. C) Producers convert light energy into chemical energy. D) Producers are found in fewer numbers than consumers.

Answers

c- Producers create nutrients from the sun. Everything else has to eat either a producer or a consumer for its nutrients

A cell has 2n=8 chromosomes...how many chromosomes will this cell have in anaphase1,anaphase2,metaphase2?(meiosis)

Answers

The answer is 8 (anaphase 1), 8 (anaphase 2), 4 (metaphase 2).

Meiosis is a cell division which results in a reduction of the number of chromosomes in half and it consists of meiosis I and meiosis II.
Before meiosis I begins, the cell is diploid (2n) and there are 8 chromosomes. In anaphase I, the sister chromatids separate from each other to the opposite sides of the cells, and after that, there are 8 chromosomes and 16 chromatids. After telophase I, there are, however, 4 chromosomes that enter meiosis II.

Meiosis II is similar to mitosis. So, in metaphase II there is the same number of chromosomes - 4 chromosomes. But, the chromosome number must double so in anaphase II there will be in total 8 chromosomes - 4 chromosomes at the one side of the cell and the 4 on the other side. After telophase II, there are 4 chromosomes.

20 POINTS!! PLS HELP for Social Studies: Out of all the different ancient lands you have learned about, discuss which one you would like to live in most!

Discuss these points on why:

Trade

Location

Land

Beliefs

Answers

Answer:

Associated with Mesopotamia are ancient cultures like the Sumerians, ... Learning about this time period can be a little confusing because these ... We believe Sumerian civilization first took form in southern Mesopotamia ... them to travel into the Persian Gulf and trade with other early civilizations,

Explanation:

Smoking and severe sunburn are linked to cancer
genetic disease
infectious disease
food poisoning

Answers

Smoking and severe sunburn are linked to cancer.Getting a severe sunburn could lead to melanoma skin cancer and smoking could lead to lung cancer.
So the answer you are looking for is A. Cancer

I hope this helps!

smoking and severe sunburn are linked to cancer

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