Which theory suggests that cells are the basic building blocks of life but don't constitute life itself?Cell theory or organismal theory?

Answers

Answer 1

Answer:

The correct answer would be the organismal theory.

The three main principles of the cell theory are:

All the living organisms are formed by one or more types of cells.
Cell forms the basic structural and functional unit of all living organisms.
Cell arises from the pre-existing cell.

The organismal theory was developed as a counter argument towards the cell theory.

One of the principles of this theory states that "cells are the basic building blocks of life but don't constitute life itself". For example, cells removed from a multicellular organism require specific life support systems in order to keep them alive.

Answer 2

Answer: This is the organismal theory: the theory that the basic unit of life is the organism, but which can be divided into cells.

Cell theory says that the basic unit of life is the cell.

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Alternative energy sources _____.
do not use fossil fuels is the answer

Answers

Correct do not use fossil fuels is the answer

Why are marriages between blood relatives prohibited in the united states and other countries?

Answers

Marriages or any form of sexual relations between blood relatives is incest and is completely prohibited in the United States and most other countries of the world.

There are two reasons for this:

1. Religious: Most major world religions prohibit marriages between blood relatives. In countries where church and other religious institutions had a strong following, incest remains a crime.

2. Biological: Medical Science has proven that off-springs of close relatives e.g. brother-sister, first cousins and even second cousins have a high chance of genetic mutation which can lead to various health issues. This is the main reason why modern societies prohibit incest

What may happen to a species whose limited habitat is destroyed by land development

Answers

Answer:

extinct

Explanation:

The practice of land development like the urbanization and industrialization which leads to rapid and heavy use of the natural resources of the lands and thereby creates pressure on the biological diversity of the lands and thus making it difficult or the survival of the species.

The land development practices of the agriculture that leads to the introduction of new species of flora and fauna create a competition of the native species and thus decrease there chances of survival and loss of habitat hence create extinction of the species.

it will become extinct

The Earth’s core is made of an alloy ofA. iron and nickel.
B. copper and iron.
C. zinc and magnesium.
D. iron and zinc.

Answers

Answer:

Option A

Explanation:

The core of earth has two parts

a) Outer core – The outer core is made up of molten alloy of iron and nickel. However, it also has traces of dense materials like gold, platinum, and uranium etc. These materials are contained at a very high temperature i.e 9,000 and 13,000 degrees Fahrenheit.

b) Inner Core – It is composed of solid dense iron but the iron is not in its purest form. It has some impurities such as sulfur etc. It has temperature ranging between 7000 to 9000 degrees Fahrenheit and is responsible for earth's magnetic field.

Hence, option A is correct

It would be A. Iron & Nickel.
Hope it helps you!:)

The tundra is a cold, ice-covered region on Earth. Recently there has been an increase in the number of plants growing there. This new plant growth is MOST likely due to A) an effort by the local people to plant trees.
B) global warming, resulting in warmer temperatures on Earth.
C) more people going to the area for recreation and vacations.
D) animals leaving the tundra for warmer regions with less snow cover.

Answers

Answer: B) global warming, resulting in warmer temperatures on Earth.

Explanation:

Tundra is the coldest biome of the world. It exhibit very low temperature range and treeless plain with snow precipitation. The global warming is the phenomena which is related with rise in global temperature due to abundance of greenhouse gases into the atmosphere. These gases are released into the atmosphere by burning of fossil fuels, industrial gaseous release and deforestation. These gases traps the heat energy from sunlight making the atmospheric temperature warm. As a result of global warming the ice caps and snow bearing areas of the tundra biome will deplete. The melting of the ice will provide proper unfrozen soil for the growth of plants. Hence, new plants will increase in numbers due to global warming.

The tundra is a cold, ice-covered region on Earth. Recently there has been an increase in the number of plants growing there. This new plant growth isMOST likely due to global warming, resulting in warmer temperatures on Earth.
Thus the answer is letter B.

Although a liver cell and a muscle cell in ahuman developed from the same single cell,
their appearance and functions are different.
This is because the liver cell
(1) contains different genes than the muscle cell
(2) expresses different genes than the muscle
cell
(3) destroys the muscle cell genes it contains
(4) lacks the genes found in muscle cells

Answers

Answer: The correct answer is-

(2) expresses different genes than the muscle cell.

Liver cell and muscle cell in human are developed from the same single cell but perform different functions that is they are specialized to perform particular function.

It is because there is differential expression of genes in these cells. In other words, specific genes are turned on to perform specific functions and other genes are turned off.

Gene expression means transcription ( formation of mRNA from DNA) and translation ( formation of protein from mRNA) of gene ( a DNA segment, which codes for particular protein) so as to form a specific protein or polypeptide.

The protein thus produced, provides specific function to the cell.

Thus, different genes are expressed in specialized cells ( such as muscle and liver cell), which enables them to perform specific functions.

(2)
expresses different genes than the muscle cell

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