Your friend claims that all mutations are harmful to living things. Do you agree or disagree with this claim?

Water pollution can impact our health as well as the health of the environment. Which of the following human activities contribu

Serjik [45]

Answer:

The correct option is C) Application of toxic fertilizers to crops

Explanation:

Toxic fertilizers are one the main causes which result in water pollution. Due to certain conditions such as flooding, the toxic fertilizers gets drained away into nearby lakes and seas. These toxic fertilizers pollute the water and kill many of the aquatic species living in the lakes or rivers. As a result, the polluted water affects human health when such a water is used for irrigation and consumption needs by the humans.

4 0

3 years ago

Distinguish between major classes of biomolecules, proteins, lipids, carbohydrates, nucleic acids?

olasank [31]

Answer:

Proteins (polymers of amino acids)

Carbohydrates (polymers of sugars)

Lipids (polymers of lipid monomers)

Nucleic acids (DNA and RNA; polymers of nucleotides)

Explanation:

Proteins:

Chemical formula is CHON

−NH2 + −COOH +R group

Monomer is Amino acids.

Examples are enzymes, and some hormones.

Uses are Storage; Signals; Structural; Contractile; Defensive; Enzyme; Transport; Receptors.

Lipids:

Chemical formula is C:H:O

Greater than 2:1 H:O (carboxyl group)

Monomer is fatty acid and glycerol.

Examples are butter, oil, cholesterol, beeswax.

Functions are energy storage; Protection; Chemical messengers; Repel water.

Carbohydrates:

Chemical formula is C:H:O

1:2:1

Monomer is monosaccharides.

Examples are Glucose, Fructose, Starch, Glycogen, Cellulose.

Uses are energy storage; structure.

Nucleic Acids:

Chemical formula is CHONP

(pentose, nitrogenous base, phosphate ).

Monomer is nucleotides.

Examples are DNA, RNA.

Uses are Genetic information

5 0

3 years ago

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Which of the following statements about cell organelles is NOT true?

Anton [14]

Answer:

B

Explanation:

many of the same organelles are located in both plants and animals cells

4 0

3 years ago

Which of the following embryonic materials is matched with a correct post-natal (after birth) derivative? (Chose the most correc

Vlad [161]

Answer: Option B.

Neural crest and peripheral nervous system.

Explanation:

Neural crest are bilateral paired cells of the neural tube that arise from the ectoderm layer of the embryo. Thesescells move to different part of the body and differentiate into various cell types like melanocytes,cartilage and bone, smooth muscle, craniofacial, neurons, gangalia e.t.c. The neural crest running through neural tube develop into peripheral nervous system after birth. Peripheral nervous system consist of neurons and gangalia outside the nervous system The peripheral nervous system connect the central nervous system to organs, skin and limbs.

8 0

3 years ago

A student claims that cellular respiration is essential to cells so that they have a means for getting rid of excess carbon diox

Romashka [77]

1. Cellular respiration does not consume carbon dioxide (CO2).

Cellular respiration is a process by which plants produce energy. It consists of anaerobic (without O2) and aerobic phase(with the presence of O2). During the cellular respiration chemical energy derived from the nutrients (like glucose) is transformed into energy molecule adenosine triphosphate (ATP).

2. Unlike photosynthesis, cellular respiration occurs in all eukaryotic organisms (photosynthesis only in plants and some microorganisms). The processes of cellular respiration occur in cytosol (glycolysis) and in the mitochondrion of a cell (Krebs cycle and electron transport chain).

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3 years ago

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