Posted in Biology

Atoms are like a blueprint, they make up things, they can make up water as in H2O, nutrients and chemical compounds. These are things that make up a living organism. and atoms make up everything and the fact that they can create something that is living is beyond comprehension if not we would be able to create living things from nonliving things


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Posted in Biology

Some organisms undergo asexual reproduction through mitosis, while others reproduce sexually, and their cells undergo meiosis to produce gametes. If there were drastic changes in temperature in an ecosystem , which process do you predict would be most beneficial to a species? A. Meiosis: It increases genetic variation, which helps ensure the species will survive. B. Meiosis: It produces more daughter cells, which increases the population of the species. C. Mitosis: It causes genetic mutations, which may be favorable to the species. D. Mitosis: It produces more offspring in a short time, which makes it likely that some will survive.

The answer is A. Meiosis: It increases genetic variation, which helps ensure the species will survive.

Meiosis increases genetic variation. This means there is a great variety of genotypes among the population. Hence, there are organisms able to survive in a wider range of temperature. If 

there were drastic changes in temperature in an ecosystem, some of the organisms will survive because their genotype allows them to live in such conditions. If there were no variety thanks to meiosis, all of the organisms would die. And that is not beneficial to a species.
Imagine on the other hand that mitosis occurred. Mitosis does not provide a variety of genotypes and all of the organism will be the same. 
If there were drastic changes in temperature in an ecosystem, all of the organisms would die because all of them could respond to the change in the same way.

Posted in Biology

Sucrose and lactose are disaccharides that have the same chemical formula, C12H22O11. However, these sugars have different characteristics and behave differently in chemical reactions. Which of the following generalizations can explain this? Disaccharides are used for different cellular processes, and they only take part in reactions in which they are needed. Disaccharides are different in structure because they are not made up of the same monosaccharides, and this gives them different properties. Disaccharides are made from the same monosaccharides, but the monosaccharides are arra

The answer is Disaccharides are different in structure because they are not made up of the same monosaccharides, and this gives them different properties.

Both sucrose and lactose are disaccharides, however, they are made up different monosaccharides:
Disaccharide = monosaccharide + monosaccharide
Sucrose = glucose + fructose
Lactose = glucose + 

galactose 

Since they have different structures, their characteristics and behaviour in chemical reactions must differ, too.

Posted in Biology

The appearance of living systems on Earth from non-living molecules is called Answer adaptation. natural selection. biological evolution. chemical evolution.

The appearance of living systems on Earth from non-living molecules is called chemical evolution.

Chemical evolution refers to the creation of living systems (complex organic molecules) from non-living (inorganic) molecules through chemical reactions on the primitive earth. Based on a theory, chemical evolution is said to occur in four stages which are; (i) simple organic substances, such as amino acids are formed by molecules in the primitive environment, (ii) the simple organic molecules combine and accumulate to form larger structures (such as proteins), (iii) the larger molecules interact to form structures called protobionts and (iv) protobionts evolve reproduction ability and transmit genetic instruction from one generation to another.

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