*Please answer quickly!*
1. Nucleic acids include RNA and DNA. The monomers of these molecules are ____.
a
fatty acids
b
amino acids
c
nucleotides
d
monosaccharides
2. Phospholipid molecules in a membrane are arranged with their ______ on the exterior and their _____ on the interior.
a
hydrophilic heads…hydrophobic tails
b
hydrophobic heads….hydrophilic tails
c
hydrophobic tails…hydrophilic heads
d
nonpolar heads…polar tails
3.A student measured the time required for a protein sample to be completely digested in the presence of an enzyme under different pH levels. At which pH are ALL three of the enzymes below the LEAST effective?
a
2
b
5
c
7
d
10
4.Sally's teacher asked her to classify a microscopic organism found in pond water. The FIRST characteristic Sally used to figure what kingdom the organism belonged to was
a
chemical composition of cell wall.
b
cell diameter.
c
cell type.
d
number of ribosomes present.
5. As DDT (or other persistent chemical that can biomagnifiy) moves up the trophic levels in food chains, or food webs, its concentration ____.
a
is eliminated
b
increases
c
decreases
d
stays the same
why even type all that this is a hw help site and u would not have fund it unless u looked up the question
1. The monomers of nucleic acids, such as RNA and DNA, are nucleotides. To get this answer, you can recall the basic structure of nucleic acids and their monomers. Generally, nucleic acids consist of a sugar molecule, a phosphate group, and a nitrogenous base. These building blocks are known as nucleotides.
2. Phospholipid molecules in a membrane are arranged with their hydrophilic heads on the exterior and their hydrophobic tails on the interior. To determine this arrangement, you can recall the properties of phospholipids. Phospholipids have a hydrophilic (water-loving) head consisting of a phosphate group, while their tails are hydrophobic (water-fearing) consisting of fatty acids. Due to this property, phospholipids arrange themselves in a bilayer structure in cell membranes with their hydrophobic tails facing inward and their hydrophilic heads facing outward.
3. To determine at which pH ALL three enzymes are LEAST effective, you can recall that enzymes have optimum pH levels at which they function most effectively. If the pH deviates from the optimum range, the effectiveness of the enzymes decreases. Therefore, you need to identify the pH level where all three enzymes would be least effective. In this case, the correct answer would be pH 2.
4. To classify a microscopic organism found in pond water, Sally used the FIRST characteristic of the chemical composition of the cell wall. To determine this answer, you can recall the order of classification criteria. When classifying organisms, scientists generally start with broad characteristics and then narrow down to more specific ones. The chemical composition of the cell wall is usually one of the first characteristics used because it helps determine the kingdom to which the organism belongs.
5. As DDT (or other persistent chemicals that can biomagnify) move up the trophic levels in food chains or food webs, their concentration increases. To determine this answer, you can recall the concept of biomagnification. Persistent chemicals, like DDT, do not easily break down in the environment and tend to accumulate in organisms over time. As one organism consumes another higher on the food chain, the concentration of the persistent chemicals magnifies or increases, leading to higher levels in top predators.
Number one is monosaccharides
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Also, the information is clearer if the designation and the answer were on the same line, e.g., "a. 2".